Lepidoptera: Moths and Butterflies
- The characteristics of these insects, their life cycle, feeding and habitat, with illustrations.
- http://www.ento.csiro.au/education/insects/lepidoptera.html

The UK Butterfly Monitoring Scheme
- This scheme is monitoring changes in the abundance of British butterflies and has produced important insights into almost all aspects of butterfly ecology.
- http://www.ukbms.org/

Furman University Lepidoptera Collection
- Gallery of images of scanned specimens.
- http://facweb.furman.edu/~snyderjohn/furmanleps/index.htm

Markku Savela's Lepidoptera
- Taxonomic tree including common and scientific names, publication details, references, links, general range maps, and some images.
- http://www.nic.funet.fi/pub/sci/bio/life/insecta/lepidoptera/

Caterpillars of Eastern Forests
- Species descriptions, life cycle, morphology, and tips on photographing, rearing, collecting, and preserving specimens of caterpillars occurring in forests of the eastern United States.
- http://www.npwrc.usgs.gov/resource/insects/cateast/cateast.htm

Caterpillars of the Pacific Northwest
- A field guide to caterpillars commonly found in forests and woodlands of the Pacific Northwest, USA, including sections on natural history, nomenclature, identification keys, and a guide to collection and preservation of specimens.
- http://www.npwrc.usgs.gov/resource/insects/catnw/catnw.htm

Butterflies and Moths of North America
- Comprehensive guide to the Lepidoptera of the United States and northern Mexico, including a photographic identification guide, county checklists, and distribution maps.
- http://www.butterfliesandmoths.org/

European Butterflies and Moths
- Photo gallery of butterflies and moths sorted by English name, scientific name, family, or country. In Polish, English, and German.
- http://www.lepidoptera.bai.pl/

LepIndex - Global Lepidoptera Names Index
- An online, updated version of The Natural History Museum's card index archive to the scientific names of the living and fossil butterflies and moths (Lepidoptera) of the world.
- http://www.nhm.ac.uk/research-curation/projects/lepindex/

Caterpillar Hostplants Database
- This is a Natural History Museum project to create a searchable database of information linking caterpillars to their host plants.
- http://www.nhm.ac.uk/research-curation/projects/hostplants/

Butterflies and Moths of the World
- Searchable database of generic names and type species. From The Natural History Museum, London.
- http://www.nhm.ac.uk/research-curation/projects/butmoth/

Russian Lepidoptera
- Information on hundreds of species of butterflies occurring in the former USSR, including type locality, synonyms, range, distribution and variation, taxonomic notes, habitat and biology, similar species, and photos of museum specimens.
- http://rusinsects.com/lep.htm

Atropos
- Publication for butterfly, moth, and dragonfly enthusiasts in the British Isles. Insect migration, conservation, and field techniques are central themes.
- http://www.atropos.info

UK-Leps
- Forum for discussion of Lepidoptera of the British Isles.
- http://groups.yahoo.com/group/uk-leps/

Lepidoptera of East Tennessee
- Photo gallery focusing on backyard moths in Knox County, Tennessee.
- http://www-chaos.engr.utk.edu/~kde/leps/LEPpage.html

Swedish Lepidoptera
- Sightings, distribution, migration, projects, and red lists.
- http://www.bostream.nu/butter/

Oz's Insect World
- Information about the butterflies of Israel and Saturnids of the World. Includes photos of specimens and some Israeli Coleoptera.
- http://www.nature-of-oz.com/

Butterflies and Moths in the Netherlands
- Information and photos of Lepidoptera in the Netherlands.
- http://www.leps.nl/

Lepidoptera of Southeastern Arizona
- Detailed information from the Arizona Lepidoptera Survey on the butterflies and moths of southeastern Arizona and Sonora, Mexico. Includes many images of dead specimens and live caterpillars.
- http://nitro.biosci.arizona.edu/zEEB/butterflies/AZLeps.html

The Nuelle Collection
- Photos of butterfly and moth specimens, mostly from Texas, by Robert Nuelle.
- http://www.worldleps.com/

David Bell's Butterflies and Moths
- Butterflies and moths of central Ontario, Canada. Observation techniques, mimicry, life cycles, changing distribution, photos, and links.
- http://home.cogeco.ca/~lunker/

UK Butterflies and Moths
- An online collection database with specimen images and details from the Natural History Museum.
- http://www.nhm.ac.uk/entomology/cockayne/

Lepidoptera of Southern Vancouver Island
- Photographs and text of 191 species by Jeremy Tatum.
- http://facweb.furman.edu/~snyderjohn/tatum/

Bill Hark's Lepidoptera Photos
- Photos of butterflies and moths from Virginia and elsewhere.
- http://www.harkphoto.com/menu.html

Moths and Butterflies of Europe
- A large photo gallery of European moths and butterflies, including larvae and pupae.
- http://www.leps.it/

Georgia Lepidoptera
- Photographs and species lists of the moths and butterflies of Georgia and the southeastern United States. Includes helpful hints for beginners, references, and links.
- http://www.daltonstate.edu/galeps/

Database of Illinois Lepidoptera
- Lists of county records for each species and species recorded in each county. From the Illinois State Museum.
- http://www.museum.state.il.us/research/entomology/leps_db.html

Lepidoptera Larvae of Australia
- Images and descriptions of biology, behavior, and life histories of 1238 Australian Lepidoptera species. Includes 462 caterpillar photos.
- http://www-cache.socs.uts.edu.au/~don/larvae/larvae.html

Catalogue of the Lepidoptera of the French Antilles
- Photographs of specimens and notes on biology and distribution of the macrolepidoptera of Martinique, Guadeloupe and their dependencies.
- http://www.inra.fr/Internet/Produits/PAPILLON/indexeng.htm

Lepidoptera.Net
- Photographs and information about almost all of the common species of butterflies in Georgia, USA with some photos of butterflies and moths from around the world.
- http://www.lepidoptera.net/

Michigan Lepidoptera Survey
- Projects, checklists of species, and photographs of butterflies and moths of Michigan.
- http://www.msu.edu/user/kriegelr/mls/

Estonian Insect News
- News in faunistics and ecology of Estonian Lepidoptera and other insects.
- http://www.zbi.ee/~tiit/uudised/frames1.html

MKLep: Butterflies and Moths of Milton Keynes
- Extensive site for Lepidoptera in Milton Keynes, England, with photographs, sightings, and survey results.
- http://www.mklep.co.uk/

Butterflies and Moths
- Notes on the biology and ecology of butterflies and moths, with some photographs by Jeroen Voogd.
- http://www.butterflies-moths.com/

Butterfly and Moth Lifecycles
- Photographs of captive moths and butterflies, including cocoons and caterpillars, mostly from Nebraska, USA.
- http://cse.unl.edu/~scotth/moths-butterflies.html

Order Lepidoptera
- Taxonomy and species accounts of moths and butterflies from the Animal Diversity Web.
- http://animaldiversity.ummz.umich.edu/arthropoda/insecta/lepidoptera.html