The larva and pupa of Plagiodera erythroptera Blanchard are described and illustrated. Morphological change in the course of larval growth and some biological notes are also given. The immature stages of this species closely resemble those of Plagiodera versicolora (Laicharting) but differ in the color pattern and the number of setae of the head and thorax.

Lampetis (Spinthoptera) chiapaneca, a new species of Buprestidae from Mexico, is described and figured. This species has been collected only in the state of Chiapas.

We analyzed data from two beetle taxa, Pselaphinae (Staphylinidae) and Histeridae, collected during a seven-week expedition to Yasuni National Park (Napo Province, Ecuador) during June–August 1999. Smoothed species accumulation curves and richness estimators were used to assess the effectiveness of Berlese extraction, flight intercept traps, light traps, and a combination of other techniques in sampling these two focal taxa. From a total of 3,465 specimens, including 871 pselaphines and 2,574 histerids, we sorted 385 species, 178 pselaphine species and 207 histerid species representing 62 pselaphine genera and 63 histerid genera. We offer regional comparisons to assess the scale of diversity documented at Yasuni. Finally, we used these empirical data, richness estimates, and simple percentages to predict that beetle diversity at this site in Yasuni National Park ranges from 9,871 to 14,102 species, and total insect diversity ranges from 24,665 to 35,255 species.

Detailed description of the second instar larva and pupa, comparative comments on the third instar and first instar larvae, and some observations on the adult behavior and the life cycle of Neoscelis dohrni (Westwood) are presented. Diagnostic structures are illustrated, and a key to the known third instar larvae of Goliathini from the world is included.

The subtribe Anillina in southeastern United States includes the genera Serranillus and Anillinus, both of which are endemic to the region. Serranillus contains two species, S. jeanneli Barr, the type-species and S. dunavani (Jeannel), new combination, transferred from Anillinus. Both occur in the southern Appalachian Mountains. Anillinus contains 28 species, 11 previously described from southeastern U. S., east of the Mississippi River and the following 17 described here as new species: A. balli (SE. Kentucky), A. barri (E. Tennessee), A. cornelli (W. North Carolina, N. South Carolina), A. daggyi (North Carolina), A. docwatsoni (North Carolina), A. erwini (W. North Carolina), A. folkertsi (SW. Alabama), A. kovariki (N. Florida), A. langdoni (E. Tennessee), A. lescheni (E. Oklahoma), A. loweae (W. North and South Carolina, E. Tennessee), A. magazinensis (W. Arkansas), A. moseleyae (W. North Carolina, E. Tennessee), A. murrayae (W. North Carolina), A. robisoni (W. Arkansas), A. stephani (E. Oklahoma), and A. tishechkini (W. Arkansas). A neotype is designated for A. elongatus Jeannel. Species are arranged in groups on the basis of microsculpture and morphometric characters. Trends and correlations in general body form and proportions, microsculpture patterns, aedeagal morphology, and distributions are discussed.

Two Central American species of the genus Aglyptinus Cockerell, A. tumerus and A. phymaphorus, are described as new species. They are notable for unusual asymmetrical expansion of stem antennomeres and presence of conspicuous spectral iridescence on the elytra of males. Probable utility of this unusual sexual dimorphism is discussed.

The genera Trichillum Harold and Pedaridium Harold are primarily South American. The northernmost known distribution is Nicaragua. In this paper we describe Pedaridium maya new species from Mexico and Guatemala that does not appear to be closely related to any previously described species.

The new species, Stator huautlae, is described. It was reared from nutlets of its host plant Salvia sessei Bentham (Lamiaceae), from Morelos, Mexico. This is the first record for the genus Stator and for a bruchid from the New World feeding in the fruits of this family. The relationships of S. huautlae to other species groups of Stator are discussed. Figures of the dorsal and lateral surfaces, the male genitalia, and eggs and exit holes of S. huautlae in the nutlets of S. sessei are included.

Two new species of Epuraea (Orthopeplus) are described from central and southern Mexico and E. (O.) quadricollis (Horn) is redescribed. Epuraea (O.) setosa new species is described from the Mexican highlands near Durango and Cerro Potosi, and E. (O.) plenasulca new species is described from the Capitol City (District Federal) and the Michoacan District. Both new species are compared to Epuraea (Orthopeplus) quadricollis (Horn), and a key is provided for all three species.

Two new and three previously described species of Agrosteomela are described, A. flavipennis new species, A. nigrita new species, A. indica (Hope), A. chinensis (Weise), and A. impressiuscula (Fairmaire). The latter two species, formerly considered subspecies of A. indica, are elevated to species. The median lobe of the aedeagus of species of Agrosteomela and the habitus of the two new species are illustrated. Type specimens are deposited in the Institute of Zoology, the Chinese Academy of Sciences, Beijing, China.

Six genus-group names in the tribe Trichiini (Coleoptera: Scarabaeidae: Cetoniinae) are discussed with regards to their availability and validity under the International Code of Zoological Nomenclature. Aleurostictus Kirby, Archimedius Kirby, Euclidius Kirby, Gymnodus Kirby, Tetrophthalmus Kirby, and Trichinus Kirby all have priority over most other generic names in the tribe but none of the names are in prevailing usage. Clarifications are needed due to the reemergence of Aleurostictus Kirby in current literature and confusion over the nomenclatural status of the other names. Type species are designated for Aleurostictus Kirby, Tetrophthalmus Kirby, and Stegopterus Burmeister and Schaum. The gender of the genera Trigonopeltastes Burmeister and Schaum and Apeltastes Howden is also discussed.

The Argentinean endemic Eucraniini genus Glyphoderus Westwood is redescribed, a key to species and a synopsis of the three known species, G. centralis Burmeister, G. monticola Burmeister, and G. sterquilinus (Westwood) is presented. The biology and food relocation behavior of the three species are described. A key to genera of the tribe Eucranini is also presented.