Bryelmis Barr, a new genus of elmid, and three new species, Bryelmis idahoensis Barr, Bryelmis rivularis Barr, and Bryelmis siskiyou Barr, are described from streams and springs in Washington, Oregon, California, and Idaho. Drawings or photographs of the adult habitus and male genitalia of each species, and of the larval habitus of the genus, are included, as well as a key to the adults of the species and revised couplets for insertion into existing adult and larval keys to the Elmidae. The biogeography, habitat, and microhabitat of the species are discussed. Aquatic liverworts are the unusual primary microhabitat of all three species of Bryelmis.

This work deals with the taxonomic composition, distribution, and bionomics of the genus Laccophilus Leach in Cuba. One new species, Laccophilus alariei Megna, Deler-Hernández, and Challet, is described. Diagnostic characters, including genitalia, are described and illustrated. A key to the Cuban species of Laccophilus is provided.

New observations of Cylindera (s. str.) celeripes (LeConte) (Coleoptera: Carabidae: Cicindelinae) are presented from Arkansas, Iowa, Missouri, and Oklahoma and discussed in the context of its historical occurrence in the eastern and central Great Plains. Once abundant in eastern Kansas and Nebraska and western Iowa, the species has declined below detectable levels in much of this area during the past century due to loss of its preferred native grassland habitats. On the other hand, robust populations have been found recently in the Red Hills of western Oklahoma, and the species is also reported in Missouri for the first time and confirmed from Arkansas (White River Hills). These recent observations suggest that the Oklahoma Red Hills population is healthy and not under immediate threat, while those in the Flint Hills and Loess Hills are vulnerable due to their small size and low numbers. The White River Hills population is documented by only a single specimen, thus its status currently cannot be assessed. Conservation measures to protect these populations may be warranted.

The North American species of Callimoxys Kraatz, 1863 are revised. Callimoxys sanguinicollis (Olivier, 1795), Callimoxys fuscipennis (LeConte, 1861), new status, and Callimoxys pinorum Casey, 1924, new status, are recognized as valid, and two new species (Callimoxys ocularis Hammond and Williams, type locality West Saylorville Lake, Iowa, and Callimoxys nigrinis Hammond and Williams, type locality near Brenham, Texas) are described. A key to the world fauna is included, as well as a review and diagnosis of the two known Palaearctic species, Callimoxys gracilis (Brullé, 1832) and Callimoxys retusifer Holzschuh, 1999. A morphometric study was conducted using 67 characters from adults of the North American species. Data were examined using stepwise discriminant analysis to determine which characters aid in the diagnosis of taxa, and their relative amounts of resolving power using canonical variates analysis. Significant sexual dimorphism and variability in morphological characters were detected, but ratios that control for body size were found to be useful in species diagnosis. Phylogenetic analysis using the genus Stenopterus Illiger, 1804 as outgroup returned a single most parsimonious tree and hypothesized C. ocularis C nigrinis as ancestral and C. sanguinicollis C. pinorum most derived.

The larva of Homophileurus integer (Burmeister, 1847) (Coleoptera: Scarabaeidae: Dynastinae: Phileurini) is described for the first time and accompanied by notes on its biology based on specimens from Suriname. An updated key to the known third-stage larvae of American Phileurini is provided.

Anthrenus (s. str.) pulaskii Kadej, new species, is described from Riverside County, California, USA. The habitus, antennae, scales, and galea with lacinia are illustrated and compared with related species. A key to the Nearctic species of Anthrenus Geoffroy is presented.

Chorological and phenological analyses of the aquatic beetle fauna (Gyrinidae, Haliplidae, Hygrobiidae, Noteridae, Dytiscidae, Hydrophilidae, Hydraenidae, Dryopidae, Elmidae, and Scirtidae) of northern Tunisia are presented. Water beetles were sampled from freshwater ecosystems at 64 sites distributed throughout northern Tunisia. In total, 123 species were identified and their distribution in the study area is discussed. Chorological categories were determined according to the geographical distribution of sampled species. Three groups of species were established based on their phenology: permanent, frequent, and seasonal species.