» Guide » Arthropods (Arthropoda)
» Hexapods (Hexapoda)
» Insects (Insecta)
» Ants, Bees, Wasps and Sawflies (Hymenoptera)
» Aculeata - Ants, Bees and Stinging Wasps
» Anthophila (Apoidea) - Bees
» Leafcutter, Mason, and Resin Bees, and allies (Megachilidae)
» Leafcutter, Resin, Mortar, Sharptail, Mason, and Woolcarder bees and relatives (Megachilinae)
» Woolcarder, yellow-marked resin, pebble, and dark bees (Anthidiini)
Tribe Anthidiini - Woolcarder, yellow-marked resin, pebble, and dark bees
California Insect Survey Publications
A series of monographs about insect groups as they exist in California (in PDF format). Many useful keys and descriptions, though most are over the head of the non-entomologically-trained. Even so, amateurs will find useful information even if they can't make full use of the articles.
NatureServe is the umbrella group for the natural heritage inventories of all the states and provinces and a of few other nations.
This site allows you to search by common name or scientific name. The data available includes range, rarity, and prospects for the future.
Lots of insect species are here. Those who are so inclined can also search for trees, wildflowers, vines, shrubs, fishes, salamanders, mammals, and much more. About 60,000 species are here.
A great source.
Site oriented towards forest and crop-associated insects in the southern US. Has links to Forestry Images, Invasive/Exotic species, IPM Images, and General Insect Images. These sites each have their own web address (and are running off the same database, apparently), but "Bugwood" seems to be the top level.