Maintained by the US Geological Survey (USGS), this modest site is a nice starting point for younger users interested in butterflies. All users, however, will enjoy the butterfly photo gallery, which offers pictures of common butterflies from around the world, organized by continent. The section currently contains thumbnail images of butterflies from Western Europe and Britain and North America,...

This database from the Department of Entomology at the Natural History Museum, London contains information on worldwide caterpillar hostplants. It consolidates a large amount of data on plants that the 22,000 Lepidoptera species eat or otherwise interact with. Users can perform searches using scientific name of either the Lepidoptera or hostplant species, or perform a "drill-down" browse. Search...

This Online Library of Lepidoptera Resources is provided by the International Lepidoptera Survey, a nonprofit "organization devoted to the discovery, determination, and documentation, of new butterflies and moths around the world." The regularly updated Online Library (in pdf format) currently holds 33 pages of hyperlinked titles alphabetically arranged by author. The free publications in the...

Created by the Department of Entomology at the Natural History Museum of London (NHM), this website features The Global Lepidoptera Names Index (LepIndex). The Index currently contains a total of 223,214 names spanning 16 superfamilies such as Acanthopteroctetoidea, Bombycoidea, Cossoidea, and Simaethistoidea -- just to name a few. The site is quite comprehensive providing sections on History of...