A new bee species of the genus Amegilla (Apinae: Anthophorini) is described and figured from western Malaysia and southern Thailand. Amegilla anekawarna Engel, new species, belongs to the zonata group of species and can be most readily confused with the widespread A. zonata (Linnaeus). The species is distinguished from A. zonata and other Southeast Asian, blue-banded Amegilla.
Bees of the genus Amegilla are Old World bees of the Anthophorini that generally resemble Anthophora, although species may frequently bear metallic blue or green pubescent bands on the metasomal terga (e.g., Figs. 1, 3). The genus can most readily be separated from Anthophora by the absence of arolia, although several other more minute features also distinguish these two genera (e.g., Brooks, 1988). In the Oriental region there is a large diversity of blue-banded species that are frequently confused with each other, typically being identified as the relatively widespread Amegilla zonata (Linnaeus). Closer examination of these bees, however, demonstrates that there are multiple, distinct species among the Southeast Asian -zonata- and melittologists should take care when attempting to identify material of this complex. Indeed, recent study of material from Southeast Asia revealed several difficulties, including some new species, and many “zonata” in collections may eventually prove to be of other taxa.
The present contribution is small step toward clarifying the poorly-understood and frequently cryptic Oriental blue-banded Amegilla. Herein I describe a new species of this zonata species group (= Zonamegilla in the classification of Brooks, 1988: alternatively, Michener, 2000, eliminated the subgeneric classification of Amegilla) from western Malaysia and southern Thailand. The new species superficially resembles the nominate species, A. zonata, which also occurs in the region. Morphological terminology for the description follows that of Engel (2001). Measurements were made using an ocular micrometer on an Olympus SZX12 Stereomicroscope.
The new species is most similar to A. zonata but can be distinguished in females by the presence of a distinct, medioapical blue band on the fifth metasomal tergum (such a band in absent in A. zonata, fifth tergum black) and by the entirely yellow ventral surface of the antennal scape (Fig. 5) (scape with only a small apical spot of yellow on the ventral the new species can be most easily recognized from A. zonata by the different facial markings (cf. Figs. 6 and 8) and by the terminalia (Figs. 10–12; vide Baker, 1996, for figures of A. zonata terminalia).
Male (holotype). Total body length 10.5 mm; forewing length 7.0 mm. Head wider than long; mandible with weak subapical tooth; clypeal protuberance slightly less than compound eye width; inner margins of compound eyes slightly converging ventrally upper interorbital distance 2.0 mm, lower interorbital distance 1.7 mm, compound eye length 2.3 mm. Scape short, first flagellar article approximately equal to combined length of second flagellar article and basal half of third flagellar article; second flagellar article about three-quarters length of third flagellar article (Fig. 9). Forewing with cu-a nearly confluent with basal vein; marginal cell length slightly less than length from marginal cell apex to wing apex; l rs-m entering second submarginal cell just distal cell midlength; 2rs-m entering third submarginal cell near cell apex; combined lengths of second and third submarginal cells greater than length of first submarginal cell; length of anterior border of second submarginal cell about one-half length of anterior border of third submarginal cell; posterior length of second submarginal cell approximately equal to posterior length of third submarginal cell. Apical margin of seventh metasomal tergum as in A. zonata (vide Fig. 4 in Baker, 1996); fifth metasomal sternum simple; hidden sterna [seventh metasomal sternum similar to A. calceifera (Cockerell) and, 4. niveocincta (Smith)] and genitalia depicted in figures 10–12.
Head imbricate; labrum and clypeus with weak punctures separated by 1–2 times a puncture width; face below level of antennal toruli impunctate except for setal articulations; face above level of antennal toruli with small punctures separated by a puncture width or less except ocellocular area nearly smooth and with a few, sparse, exceedingly small, faint punctures. Mesosoma weakly imbricate; mesoscutum with small punctures separated by a puncture width or less; mesoscutellum with punctures as on mesoscutum except separated by less than a puncture width; pleura with punctures similar to those of mesoscutum except distinctly weaker (becoming even more faint ventrally) and separated by a puncture width or less. Metasomal terga imbricate, sterna faintly imbricate; terga with faint, small punctures separated by 1-3 times a puncture width.
Integument of head black except as follows: flagellum brown except ventral surface of scape yellow; outer surface of mandible yellow (Fig. 2); labrum yellow except clear patches at basilateral corners (Fig. 6); paraocular areas bordering clypeus; supraclypeal area below level of antennal toruli, mediobasally with small projection of yellow between toruli toward median line; and clypeus except distinct, rectangular patches on basilateral corners as depicted in figure 6.
Integument of legs and tegula brown; wing veins dark brown, membrane hyaline, slightly tinged with yellow. Integument of metasomal terga black, sterna dark brown.
Pubescence of head and mesosoma largely yellow, yellow setae intermixed with simple fuscous setae, such fuscous setae most numerous on vertex, mesoscutum, mesoscutellum and absent from labrum, gena, postgena, pleura, legs, and propodeum; yellow setae of head becoming progressively white on gena to entirely white on postgena (Fig. 2); yellow setae of mesosomal nota becoming progressively white on pleura. Outer surfaces of coxae, trochanters, tibiae, pro- and mesofemora, and protarsi with white setae, otherwise setae of legs fuscous. Metasomal terga with strong apical bands composed of appressed setae (Figs. 2, 4), such setae largely white with faintly iridescent blue highlight; terga with scattered, erect to suberect white setae on lateral margins, such setae also present on anterior-facing surface of first metasomal tergum; dorsal-facing surface of first metasomal tergum and succeeding terga with scattered, erect to suberect, black setae, intermixed with short, suberect, black setae; sterna with sparse, suberect, white setae on central discs, such setae becoming longer and more numerous laterally and apically except medially becoming fuscous on fourth and fifth sterna.
Female. As described for the male except in typical sex-limited features and as indicated: Total body length 12.7 mm; forewing length 8.6 mm. Inner margins of compound eyes slightly converging ventrally, upper interorbital distance 2.3 mm, lower interorbital distance 2.1 mm, compound eye length 2.9 mm. Apical half of mandible brown; facial markings as depicted in figure 5. Pubescence as in male except fuscous setae of vertex and mesosomal dorsum slightly more numerous; erect to suberect setae of first metasomal tergum generally yellow intermixed with paler, nearly white in some places, setae; apical bands more distinctly iridescent blue (Figs. 1, 3), with distinct band present on fifth metasomal tergum.
Holotype - male (Figs. 2, 4, 6), Malaysia, Taiping, Perak, ii/iii.1989 [February-March 1989], K.C. Liew (deposited in the Snow Entomological Collection, Division of Entomology, University of Kansas Natural History Museum). Paratypes - male, Malaysia, Perak, Ulu Piah, 20.x. 1973 [20 October 1973], C.G. Roche. Male, Malaysia, Lasah, 5.vi.l974 [5 June 1974], C.G. Roche. Female, Malaysia, Taiping, Perak, vi/vii.1990 [June-July 1990], K.C. Liew. Female (Figs. 1, 3, 5), Sakaerat [Sakaerat Environmental Research Station (101°55′E, 14°30′N), about 40 km S of Nakon Ratchasima (Korat) in Nakhon Ratchasima Province, Thailand] DDF [dry deciduous forest], 20 June 1995. All paratypes are in the Snow Entomological Collection, Division of Entomology, University of Kansas Natural History Museum.
The specific epithet is a noun in apposition and is the Malayan term Aneka warna, meaning “more than one color” and being the name of the heavenly palace garden of the gods from the Wayang myths of Malaysia and Indonesia.
The facial markings of male A. anekawarna approximate to some degree those of Indian and Nepalese A. zonata cingulifera (Cockerell) (vide Baker, 1996) but these latter bees have larger, black clypeal markings more similar to those of females and have the terminalia and genitalia the same as in the darker A. zonata zonata from further East.
I am grateful to Mr. Hirohiko Nagase for contributing some of the material discussed herein and to two anonymous reviewers for making valuable comments on an earlier draft of the manuscript. Partial support for this study was provided by a Guggenheim Fellowship from the John Simon Guggenheim Memorial Foundation. This is contribution No. 3467 of the Division of Entomology, University of Kansas Natural History Museum.