Hesperiidae
Hesperiinae, Megathyminae, Pyrginae, Hesperiidae of Australia, Hesperiidae of Russia, Skippers of North America
Lycaenidae
Lycaeninae, Miletinae, Polyommatinae, Theclinae, Gossamer-wing Butterflies of North America
Nymphalidae
Apaturinae, Charaxinae, Danaus, Heliconiinae, Libytheinae, Limenitidinae, Nymphalinae, Satyrinae, Brush-footed Butterflies of North America, Louis Maienza Productions, Niklas Wahlberg, Satyridae of Russia, Ullasa Kodandaramaiah
Riodinidae
Arizona Metalmark (Calephelis arizonensis), Metalmarks of North America, Mormon Metalmark (Apodemia mormo), Riodinidae of North America, Swamp Metalmark (Calephelis muticum)
Bernd Harmsen's Butterfly Pages
Lists of endangered butterfly species, information on life cycles and migration, and links.
Butterflies of North America
US Geological Survey's guide to the butterflies of the US and northern Mexico, including a photographic identification guide, county checklists, and distribution maps.
Butterflies of the Lake Baikal Region
Photographs of specimens. Most content in Russian.
Jamides
Articles about the Lycaenidae of southeast Asia, list of Japanese butterflies, and information about Japanese insect associations.
Linneaus' Butterfly Type Specimens
Images of the original specimens of dozens of species. From the Natural History Museum, London.
The Butterfly Conservatory
Past exhibit at the American Museum of Natural History: photographs, webcams, virtual tour.