Good insect encyclopedias include the "Encyclopedia of Insects" edited by Vincent Resh and Ring Carde, and the Smithsonian Handbook "Insects Spiders and Other Terrestrial Arthropods" by George McGavin. Online insect encyclopedias include the Smithsonian Institute's bug info website and Insectopedia.com.
The award winning "Encyclopedia of Insects" features more than a thousand insect photos, detailed physical descriptions of species and facts about insect genetics, habits and ecological roles. The book features articles from hundreds of well-regarded entomologists. Purchase of the print book includes access to an online version.
The Smithsonian Handbook on insects includes over 650 pictures and illustrations of insects and contains details on more than 550 species of insects and other arthropods.