Identification, Images, & Information
For Insects, Spiders & Their Kin
For the United States & Canada
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[cite:617432]
"For teaching purposes only; do not review, quote or abstract"
All in all, good and apparently up-to-date info under the 'Habits' or 'General Characteristics' or 'Overview' links; especially valuable are the profiles (with ref. lists) of minor/obscure/exotic groups on which very little info is available online otherwise (i bumped into the site looking for info on Monomachidae).
The interface is a bit awkward, the links other than those indicated above are mostly dead (incl. 'Home'), and some underlined/bracketed subtitles that look like links are confusing; also, it took me quite some time to figure out the author, Prof. Legner (based on the URL only; there is no 'ref' in 'legneref', as it's turned out).
http://www.faculty.ucr.edu/~legneref/identify/taxnames.htm