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For Insects, Spiders & Their Kin
For the United States & Canada
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Series Staphyliniformia

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A revision of the species of Cafius from the west coast of North America with notes on the east coast species
This is a great resource for identifying North American Cafius to species. Written in 1980 by H. E. Orth and Ian Moore.

The keys are straightforward, the descriptions well-written and detailed, and there are figures at the end of the article...including large, good-quality, dorsal-view line drawings for each of the 13 species covered, and drawings of antennae for 5 species and aedeagi for all 13. While the emphasis is on the 10 species known (in 1980) from the west coast, it also includes a key to the five east coast species, with briefer discussions of them.

Brigham W.U. (1995) Hydrophilinae: Checklist, classification, and synonymy of genera and subgenera
after Hansen 1991 (subfamily status follows Lawrence and Newton 1995) -- matches the classification also followed in American Beetles(1) and herein.

Cholevidae of the World

Key for the identification of British Leiodidae
A Google hosted site, Mike's insect keys. I can’t vouch for the accuracy of the keys but maybe one of the editors can vet it.

Hall W.E. (1997) Ptiliidae -- Featherwing beetles (in The Tree of Life Web Project)

Gruber J.P. (2003) Hister beetles of Wisconsin
checklist of about 100 spp., with quality habitus photos and distribution maps of most species

Histerid Beetles (Coleoptera: Histeridae) of Louisiana, by A.K. Tishechkin
Annotated checklist of about 100 spp., with quality photos of each species

MacGown J.A. (2010) Aquatic Hydrophilidae of Mississippi
checklist (based on(1)) with very good habitus illustrations of selected spp.

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