Identification, Images, & Information
For Insects, Spiders & Their Kin
For the United States & Canada
[cite:867555]
lot of good info, but unfortunately the genera are simply alphabetized with no suprageneric classification, and the diversity in each zoogeo realm not reflected [just presence noted]
http://www.nadsdiptera.org/Tach/WorldTachs/Genera/Worldgenera.htm