This is the 11th supplement since publication of the seventh edition of the Check-list of North American Birds (American Ornithologists' Union [AOU] 1998). It summarizes decisions made between 1 April 2010 and 15 April 2011 by the AOU's Committee on Classification and Nomenclature—North and Middle America. The Committee has continued to operate in the manner outlined in the 42nd Supplement (AOU 2000). There were no changes to committee membership in 2010.

Changes in this supplement include the following: (1) six species (Pterodroma rostrata, Procellaria aequinoctialis, Circus buffoni, Accipiter poliogaster, Gallinago solitaria, and Oryzoborus crassirostris) are added to the main list (including three species transferred from the Appendix) on the basis of new distributional information; (2) two species (Aphelocoma wollweberi and Setophaga flavescens) are added as a result of splits from species already on the list; (3) three species' names are changed (to Gallinula galeata, Charadrius nivosus, and Chaetura meridionalis) because of splits from extralimital species; (4) two species are changed (to Amazilia brevirostris and Ramphastos ambiguus) by being lumped with extralimital species; (5) the authority for one genus (Peucedramus) is changed; (6) the type localities of two species (Aethia pygmaea and Spizella breweri) are revised; (7) the distributional status of one species (Puffinus nativitatis) is changed; (8) the category of occurrence of one species (Chrysomus icterocephalus) is changed; (9) the English name of one species (Aphelocoma ultramarina) is modified as a result of a taxonomic change, and the English name of another species (Turdus nudigenis) is modified to distinguish it from an Old World species; and (10) seven species (Procellaria aequinoctialis, Tigrisoma mexicanum, Heliornis fulica, Chloroceryle amazona, Pachyramphus major, Myadestes occidentalis, and Turdus plumbeus) are added to the list of species known to occur in the United States.

More sweeping changes derive from adoption of a new classification of the Parulidae, which results in the following: (1) 40 species (Geothlypis tolmiei, G. Philadelphia, G. formosa, Setophaga plumbea, S. angelae, S. pharetra, S. citrina, S. kirtlandii, S. tigrina, S. cerulea, S. americana, S. pitiayumi, S. magnolia, S. castanea, S. fusca, S. petechia, S. pensylvanica, S. striata, S. caerulescens, S. palmarum, S. pityophila, S. pinus, S. coronata, S. dominica, S. vitellina, S. discolor, S. adelaidae, S. subita, S. delicata, S. graciae, S. nigrescens, S. townsendi, S. occidentalis, S. chrysoparia, S. virens, Basileuterus lachrymosus, Cardellina canadensis, C. pusilla, C. rubra, and C. versicolor) are transferred to currently recognized genera; (2) one genus (Myiothlypis) is added because of a split from another genus; (3) six genera (Parula, Dendroica, Wilsonia, Ergaticus, Euthlypis, and Phaeothlypis) are deleted by being lumped with other genera; and (4) a new linear sequence is adopted for genera and species in this family.

One newly recognized order (Pteroclidiformes) is added to the main list because of a split from an existing order, two newly recognized families (Sapayoidae and Tityridae) are added to the main list by splits from existing families, and one family (Eurylaimidae) is removed because of one of these splits. A new linear sequence is adopted for families in the furnarioid suboscines. Four genera (Schiffornis, Laniocera, Tityra, and Pachyramphus) are moved from incertae sedis to the new family Tityridae, and one species (Sapayoa aenigma) is moved to the new family Sapayoidae. The genus Chlorospingus is moved from the family Thraupidae to the family Emberizidae. Five genera (Luscinia, Tarsiger, Copsychus, Oenanthe, and Saxicola) are moved from the family Turdidae to the family Muscicapidae, and a new linear sequence is adopted for species in the family Muscicapidae.

Literature that provides the basis for the Committee's decisions is cited at the end of this supplement, and citations not already in the Literature Cited of the seventh edition (with supplements) become additions to it. An updated list of the bird species known from the AOU Check-list area is available at  www.aou.org/checklist/north/index.php.

The following changes to the seventh edition (page numbers refer thereto) and its supplements result from the Committee's actions:

pp. xvii–liv. Change the number in the title of the list of species to 2,078. Insert the following names in the proper position as indicated by the text of this supplement:

Delete the “(H)” that follows Puffinus nativitatis Christmas Shearwater.

Move PTEROCLIDIDAE and its included species to the newly inserted order PTEROCLIDIFORMES, to follow Fratercula cirrhata.

Transfer Sapayoa aenigma to the newly inserted family SAPAYOIDAE, to follow Campephilus imperialis.

Change the sequence of families in the furnarioid suboscines (FURNARIIDAE through RHINOCRYPTIDAE) to:

Transfer Schiffornis turdina, Laniocera rufescens, the two species of Tityra, and the nine species of Pachyramphus, in this sequence, to the newly inserted family TITYRIDAE, to precede COTINGIDAE. Leave Piprites griseiceps as Genus INCERTAE SEDIS within the Tyrannidae, following Tyrannus savana.

Move the four species of Luscinia, Tarsiger cyanurus, Copsychus malabaricus, Oenanthe oenanthe, and Saxicola torquatus to MUSCICAPIDAE, and rearrange the species in this family in the following sequence:

Rearrange the generic placements and sequence of species in PARULIDAE to the following:

Move the six species of Chlorospingus to EMBERIZIDAE to follow Junco phaeonotus.

Delete the “(A)” that follows Chrysomus icterocephalus Yellow-hooded Blackbird.

p. 16. Before the account for Bulweria bulwerii, insert the following new account:

Pterodroma rostrata (Peale). Tahiti Petrel.

p. 17. Before the account for Procellaria parkinsoni, insert the following new account:

Procellaria aequinoctialis Linnaeus. White-chinned Petrel.

p. 20. Change the final paragraph of the Distribution statement for Puffinus nativitatis to read: Ranges at sea in the tropical Pacific Ocean east to waters off southern Mexico (between Nayarit and Oaxaca) and Costa Rica (50 km west of Cabo Blanco, Nicoya Peninsula, Puntarenas; Obando-Calderón et al. 2009).

p. 39. A record of the Bare-throated Tiger-Heron, Tigrisoma mexicanum, in the United States is recognized. After the last sentence in the Distribution statement, add the following new paragraph: Accidental in southern Texas (Bentsen-Rio Grande Valley State Park, Hidalgo County, 21 December 2009–20 January 2010; Nirschl and Snider 2010).

p. 92. After the account for Circus cyaneus, insert the following new account:

Circus buffoni (Gmelin). Long-winged Harrier.

p. 93. Before the account for Accipiter soloensis, insert the following new account:

Accipiter poliogaster (Temminck). Gray-bellied Hawk.

p. 137. Gallinula galeata is treated as a species separate from the allopatric G. chloropus. Change the scientific name, English name, and citation to:

Gallinula galeata (Lichtenstein). Common Gallinule.

p. 139. A record of the Sungrebe, Heliornis fulica, in the United States is recognized. Change the last paragraph of the Distribution statement to: Accidental in central New Mexico (Bosque del Apache National Wildlife Refuge, Socorro County, 13 and 18 November 2008; Williams et al. 2009) and Trinidad.

pp. 145–146. Charadrius nivosus is treated as a species separate from the allopatric C. alexandrinus. Change the scientific name and citation to:

Charadrius nivosus (Cassin). Snowy Plover.

p. 177. After the account for Gallinago stenura, insert the following new account:

Gallinago solitaria Hodgson. Solitary Snipe.

p. 215. Change the type locality of Aethia pygmaea to “(Bird Island, between Asia and America = Unalaska Island, Aleutian Islands, Alaska; Gibson and Banks 2010, Proc. Biol. Soc. Wash. 123:193–195.)”.

p. 217. After the account for Fratercula cirrhata, insert the heading:

Chaetura meridionalis Hellmayr. Sick's Swift.

p. 323. A record of the Amazon Kingfisher, Chloroceryle amazona, in the United States is recognized. Add the following paragraph to the end of the Distribution statement: Accidental in southern Texas (Laredo, Webb County, 24 January–3 February 2010; Wormington and Epstein 2010).

p. 331. Ramphastos swainsonii is treated as a subspecies of R. ambiguus, following Remsen et al. (2011). Delete the account for Ramphastos swainsonii and insert the following new account:

Ramphastos ambiguus Swainson. Black-mandibled Toucan.

p. 347. Delete the heading “Family EURYLAIMIDAE: Broadbills” and the Notes that follow this heading and insert the heading “Family SAPAYOIDAE: Sapayoa” to precede the species account for Sapayoa aenigma. After the new family heading, insert the following:

Notes: This monotypic family was formerly included in the Eurylaimidae sensu lato (e.g., Banks et al. 2008), but is here given familial status based on its long isolation from the other broadbills, as reflected in its phylogenetic, morphological, and biogeographical distinctness (Fjeldså et al. 2003, Chesser 2004, Irestedt et al. 2006, Moyle et al. 2006).

pp. 347–372. Recent genetic studies (e.g., Moyle et al. 2009) indicate that the evolutionary relationships of the furnarioid families are not accurately reflected in the current linear sequence. Change the sequence of furnarioid families, with no changes in species sequence, to:

Under the heading Suborder TYRANNI: Suboscines, insert the following:

Notes.—The sequence of furnarioid families (Thamnophilidae through Furnariidae) is derived from the phylogenetic analysis of Moyle et al. (2009).

pp. 416–420. After the account for Tyrannus savana, change the heading Genera INCERTAE SEDIS to Genus INCERTAE SEDIS and delete the Notes under this heading. Insert the following Notes under Genus PIPRITES Cabanis:

Notes.—The genus Piprites has presented a taxonomic challenge for more than a century. Recent genetic studies indicate that it is either the sister group to the Tyrannidae (Ericson et al. 2006, Ohlson et al. 2008) or an isolated lineage near the base of the Tyrannidae (Tello et al. 2009).

After the account for Piprites griseiceps, insert the following heading and Notes:

Remove the current species account for A. ultramarina and insert the following new species accounts:

Aphelocoma ultramarina (Bonaparte). Transvolcanic Jay.

Aphelocoma wollweberi Kaup. Mexican Jay.

pp. 494–498. Recent phylogenetic studies indicate that the affinities of several genera currently included in the Turdidae lie instead with the Muscicapidae, and that the current sequence of species in the Muscicapidae does not reflect their evolutionary relationships. Move Genus LUSCINIA Forster, Genus TARSIGER Hodgson, Genus COPSYCHUS Wagler, Genus OENANTHE Vieillot, and Genus SAXICOLA Bechstein, their citations, and their included species to the family Muscicapidae. Insert the following Notes after the citations for Copsychus, Oenanthe, and Saxicola, and after the first sentence in the Notes for Luscinia and Tarsiger: Formerly included in the family Turdidae, but analyses of nuclear and mitochondrial DNA (Sangster et al. 2010, Zuccon and Ericson 2010) indicate that this genus forms part of the Muscicapidae. Delete the Notes under the heading Family MUSCICAPIDAE: Old World Flycatchers.

Rearrange the sequence of genera and species in the Muscicapidae as follows:

p. 500. Records of the Brown-backed Solitaire, Myadestes occidentalis, in the United States are recognized. Add the following paragraph to the end of the Distribution statement: Accidental in southeastern Arizona (Madera Canyon, Santa Rita Mountains, 4–7 October 1996; Miller and Ramsey canyons, 16 July–1 August 2009; Doren 2010).

p. 510. Change the English name for Turdus nudigenis to Spectacled Thrush, following the AOU South American Check-list Committee (Remsen et al. 2011). Change the first and second sentences of the Notes to: Also known as Bare-eyed Thrush, American Bareeyed Thrush, Naked-eyed Thrush, Yellow-eyed Thrush, and Bareeyed Robin. The English name was changed from Bare-eyed Thrush (AOU 1983, Banks et al. 2008) to avoid confusion with the African species Turdus tephronotus, also called Bare-eyed Thrush.

p. 512. A record of the Red-legged Thrush, Turdus plumbeus, in the United States is recognized. Add the following paragraph to the end of the Distribution statement: Accidental in east-central Florida (Melbourne Beach, Brevard County, 31 May 2010; Anderson and Ponce 2010).

p. 532. The generic name Peucedramus should be attributed to Coues, rather than Henshaw, in accordance with Article 50.1.1 of the Code of Zoological Nomenclature (ICZN 1999). Change the heading and citation for Peucedramus to:

Under the heading Genus VERMIVORA Swainson, replace the existing Notes with the following:

Notes.—Formerly included six species (peregrina, celata, ruficapilla, virginiae, crissalis, and luciae) now placed in Oreothlypis. See comments under Oreothlypis.

Under the heading Genus OREOTHLYPIS Ridgway, replace the existing Notes with the following:

Notes.—Genetic studies (Avise et al. 1980, Lovette and Bermingham 2002, Klein et al. 2004, Lovette and Hochachka 2006, Lovette et al. 2010) indicate that gutturalis and superciliosa are not closely related to two species formerly placed in Parula (Setophaga americana and pitiayumi), that the six species formerly placed in Vermivora are not closely related to true Vermivora (bachmanii, chrysoptera, and cyanoptera), and that gutturalis and superciliosa and the six former Vermivora species form sister groups.

Under the heading Genus OPORORNIS Baird, replace the existing Notes with the following:

Notes.—Formerly included three species (formosus, Philadelphia, and tolmiei) now placed in Geothlypis, from which Oporornis sensu stricto (= O. agilis) differs in locomotion, song, and general behavior (Bent 1953, Dunn and Garrett 1997). Analyses of sequences of mitochondrial DNA (Escalante et al. 2009, Lovette et al. 2010) indicate that the phylogenetic placement of O. agilis is likely outside of the expanded Geothlypis clade. An analysis of sequences of all Geothlypis and Oporornis species indicated that O. agilis is sister to Geothlypis sensu lato (Escalante et al. 2009), whereas an analysis that also included Leucopeza semperi indicated that O. agilis may be sister to this species (Lovette et al. 2010). See comments under Geothlypis.

Under the heading Genus GEOTHLYPIS Cabanis, replace the existing Notes with the following:

Notes.—Phylogenetic analyses of sequences of mitochondrial and nuclear DNA (Escalante et al. 2009, Lovette et al. 2010) indicate that several species often placed in Oporornis (tolmiei, Philadelphia, and formosd) are more closely related to Geothlypis species than to Oporornis sensu stricto (cf. Lowery and Monroe 1968).

In the species accounts for Geothlypis tolmiei and G. Philadelphia, add the following sentence to the end of the Notes: Formerly placed in the genus Oporornis. See comments under Geothlypis.

In the species account for Geothlypis formosa, insert the following:

Notes.—Formerly placed in the genus Oporornis. See comments under Geothlypis.

Under the heading Genus CATHAROPEZA Sclater, replace the existing Notes with the following:

Notes.—Phylogenetic analyses of sequences of nuclear and mitochondrial DNA (Lovette et al. 2010) indicate that the monotypic genus Catharopeza is sister to Setophaga. Although sometimes merged with the former Dendroica (Bond 1967, Kepler and Parkes 1972), now Setophaga, C. bishopi is here maintained in a separate genus based on its genetic and phenotypic distinctness, including differences in voice, behavior, and morphology (Bond 1972, Andrle and Andrle 1976, Robbins and Parker 1997).

Under the heading Genus SETOPHAGA Swainson, insert the following:

Notes.—Phylogenetic analyses of sequences of mitochondrial and nuclear DNA (Lovette et al. 2010) indicate that all species formerly placed in Dendroica, one species formerly placed in Wilsonia (citrina), and two species formerly placed in Parula (americana and pitiayumi) form a clade with the single species traditionally placed in Setophaga (ruticilla). The generic name Setophaga has priority for this clade.

In the species accounts for Setophaga plumbea, angelae, pharetra, pityophila, vitellina, graciae, and nigrescens, replace the existing Notes with: Formerly placed in the genus Dendroica. See comments under Setophaga.

In the species account for Setophaga citrina, insert the following:

Notes.—Formerly placed in the genus Wilsonia. See comments under Setophaga.

In the species accounts for Setophaga kirtlandii, tigrina, cerulea, magnolia, castanea, fusca, petechia, pensylvanica, striata, caerulescens, palmarum, pinus, coronata, and discolor, insert the following Notes, if Notes are not present, or add the following to the end of the Notes: Formerly placed in the genus Dendroica. See comments under Setophaga.

In the species account for Setophaga americana, add the following to the end of the Notes: Formerly placed in the genus Parula. See comments under Setophaga.

In the species account for Setophaga pitiayumi, replace the existing Notes with: Also known as Olive-backed Warbler. Groups: S. pitiayumi [Tropical Parula] and S. graysoni (Ridgway, 1887) [Socorro Warbler]. Formerly placed in the genus Parula. See comments under Setophaga and S. americana.

For changes to the species account for Setophaga dominica, and for a new species account for S. flavescens, see the next entry below (p. 546).

In the species account for Setophaga adelaidae, replace the existing Notes with: Formerly included S. subita and S. delicata, now considered distinct species (Lovette et al. 1998, Lovette and Bermingham 1999). Formerly placed in the genus Dendroica. See comments under Setophaga.

In the species accounts for Setophaga subita and delicata, replace the existing Notes with: Formerly placed in the genus Dendroica. See comments under D. adelaidae and Setophaga.

In the species account for Setophaga townsendi, replace the existing Notes with: Setophaga townsendi, S. occidentalis, S. virens, and S. chrysoparia constitute a superspecies (Mengel 1964). Setophaga townsendi and S. occidentalis hybridize extensively in Washington, where S. townsendi appears to be expanding its range at the expense of S. occidentalis (Rohwer et al. 2001, Krosby and Rohwer 2009). Formerly placed in the genus Dendroica. See comments under Setophaga.

In the species accounts for Setophaga occidentalis, chrysoparia, and virens, replace the existing Notes with: Formerly placed in the genus Dendroica. See comments under Setophaga and S. townsendi.

Insert the following heading in a position following the account for Setophaga virens:

Transfer Phaeothlypis fulvicauda (p. 567) to the genus Myiothlypis, delete the genus heading and Notes for Phaeothlypis, and move the citation for Phaeothlypis into the synonymy of Myiothlypis. In the species account for M. fulvicauda, insert the following at the end of the Notes: Formerly placed in the genus Phaeothlypis.

Under the heading Genus BASILEUTERUS Cabanis, replace the existing Notes with the following:

Notes.—Phylogenetic analyses of sequences of nuclear and mitochondrial DNA (Lovette et al. 2010) indicate that true Basileuterus consists of lachrymosus, formerly placed in Euthlypis, rufifrons, melanogenys, ignotus, belli, culicivorus, tristriatus, and the extralimital species hypoleucus and trifasciatus. Formerly included many, mostly extralimital, species now placed in the genus Myiothlypis.

In the species account for Basileuterus lachrymosus, insert the following:

Notes.—Formerly placed in the genus Euthlypis. See comments under Basileuterus.

Under the heading Genus CARDELLINA Bonaparte, insert the following:

Notes.—Phylogenetic analyses of sequences of nuclear and mitochondrial DNA (Lovette et al. 2010) indicate that two species formerly placed in the genus Wilsonia (canadensis and pusilla) and both species formerly placed in the genus Ergaticus (rubra and versicolor) form a clade with Cardellina rubrifrons. The generic name Cardellina has priority for this clade.

In the species account for Cardellina canadensis, insert the following:

Notes.—Formerly placed in the genus Wilsonia. See comments under Cardellina.

In the species account for Cardellina pusilla, insert the following at the end of the Notes: Formerly placed in the genus Wilsonia. See comments under Cardellina.

In the species accounts for Cardellina rubra and C. versicolor, insert the following at the end of the Notes: Formerly placed in the genus Ergaticus. See comments under Cardellina.

Under the heading Genus ZELEDONIA Ridgway, replace the existing Notes with the following:

Notes.—Phylogenetic analyses of sequences of mitochondrial DNA (Lovette and Bermingham 2002, Klicka et al. 2007) indicate that the genus Zeledonia represents an old lineage of uncertain affinities, one that may be sister to the “core Parulidae” sensu Lovette et al. (2010).

Under the heading Genus ICTERIA Vieillot, replace the existing Notes with the following:

Notes.—Phylogenetic analyses of sequences of mitochondrial DNA (Lovette and Bermingham 2002, Yuri and Mindell 2002, Klein et al. 2004, Klicka et al. 2007) indicate that the genus Icteria represents an old lineage of uncertain affinities, probably related to the Parulidae, Icteridae, or Emberizidae.

Under the heading Genus XENOLIGEA Bond, replace the existing Notes with the following:

Notes.—Phylogenetic analyses of sequences of mitochondrial DNA (Lovette and Bermingham 2002, Klein et al. 2004, Klicka et al. 2007) indicate that the genera Xenoligea and Microligea are sister taxa of uncertain affinities, likely allied to a small group of non-parulid passerines endemic to the West Indies.

Under the heading Genus MICROLIGEA Cory, replace the existing Notes with the following:

Notes.—See comments under Xenoligea.

Under the heading Genus TERETISTRIS Cabanis, replace the existing Notes with the following:

Notes.—Phylogenetic analyses of sequences of mitochondrial DNA (Lovette and Bermingham 2002, Klein et al. 2004, Klicka et al. 2007) indicate that Teretistris is a genus of uncertain affinities, likely allied to a small group of non-parulid passerines endemic to the West Indies.

p. 546. Setophaga flavescens is treated as a species separate from S. dominica. Delete “, and also in the northern Bahama Islands (Grand Bahama, Abaco).” from the end of the breeding distribution of S. dominica. Change the Notes for S. dominica to:

Notes.—Formerly placed in the genus Dendroica. See comments under Setophaga and S. flavescens.

After the species account for S. dominica, insert the following new species account:

Setophaga flavescens (Todd). Bahama Warbler.

pp. 570–571. Remove the genus Chlorospingus, its citation, and its included species from incertae sedis within the Thraupidae and position them following the species account for Junco phaeonotus (p. 626) in the Emberizidae. After the citation for the genus, insert the following:

Notes.—Formerly included in the family Thraupidae. Recent analyses of mitochondrial DNA (Klicka et al. 2007, DaCosta et al. 2009) indicate that Chlorospingus forms part of the New World radiation of the Emberizidae, although its exact placement remains to be determined.

p. 594. After the account for Oryzoborus funereus, insert the following new species account:

Oryzoborus crassirostris (Gmelin). Large-billed Seed-Finch.

p. 611. Change the type locality of Spizella breweri to “(Western North America, California, New Mexico = Black Hills, Dak[ota Territory] = Laramie Range, Albany County, Wyoming; Banks and Gibson 2007, Auk 124:1083–1085.)”.

p. 642. Chrysomus icterocephalus, added to the main list on the basis of an old specimen record from Barbados (Chesser et al. 2010), appears to be well established and breeding in extreme eastern Panama (Angehr 2011). Change the first sentence of the Distribution statement to: Breeds and resident with local seasonal movements in lowlands of eastern Panama (EI Real, Darién), northwestern Colombia (also an isolated population near Bogotá) east through Venezuela, the Guianas, and Trinidad south to the mouth of the Amazon, Brazil, and west up the Amazon to northeastern Peru.

p. 686. Delete the account for Pterodroma rostrata from the Appendix.

p. 687. Delete the account for Procellaria aequinoctialis from the Appendix.

p. 690. Delete the account for Circus buffoni from the Appendix (Chesser et al. 2009).

p. 695. Amazilia chionopectus is treated as a junior synonym of A. brevirostris, following Schuchmann (1999) and Weller and Schuchmann (2009). Change Amazilia chionopectus (Gould) to Amazilia brevirostris (Lesson) and change the citation for this species to:

Ornismya brevirostris Lesson, 1829, Hist. Nat. Ois.-Mouches, p. xxv, pl. 77. (Guiana.)

After the last sentence of the text of this species account, insert the following: Formerly listed as Amazilia chionopectus (Gould). Some authors place the species in the genus Agyrtria.

pp. 705 ff. Make the following changes to the list of French names of North American birds:

Insert the following names in the proper position as indicated by the text of this supplement:

Transfer Schiffornis turdina, Laniocera rufescens, the two species of Tityra, and the nine species of Pachyramphus, in this sequence, to the newly inserted TITYRIDAE, with no change in French names.

Change the sequence of families in the furnarioid suboscines (FURNARIIDAE through RHINOCRYPTIDAE) to the following sequence, with no change in French names:

Move the four species of Luscinia, Tarsiger cyanurus, Copsychus malabaricus, Oenanthe oenanthe, and Saxicola torquatus to MUSCICAPIDAE, and rearrange the species in this family in the following sequence, with no change in French names:

Rearrange the generic placements and sequence of species in PARULIDAE as indicated by the text of this supplement, with no change in French names.

Change Amazilia chionopectus to Amazilia brevirostris in APPENDIX (Part 1), with no change to the French name.

Delete the following names from the APPENDIX (Part 1):

Proposals considered but not accepted by the committee included division of Anas platyrhynchos (Mallard), Poecile gambeli (Mountain Chickadee), and Geothlypis aequinoctialis (Masked Yellowthroat) into two species each; division of Setophaga coronata (Yellow-rumped Warbler) into two, three, or four species; transfer of Luscinia sibilans (Rufous-tailed Robin), L. cyane (Siberian Blue Robin), and L. calliope (Siberian Rubythroat) to different genera; modification of the type locality of Poecile gambeli (Mountain Chickadee); and modification of the English names of wrens in the genus Troglodytes.