Listed for the region are 474 Tabanidae distributed in 27 genera as follows: Apatolestes-8 plus 1 subsp., Brennania-1, Esenbeckia-2, Goniops-1, Pilimas-2, Stonemyia-6 plus 1 subsp., Assipala-1, Silvius-7 (including 1 in subg. Zeuximyia), Chrysops-68 plus 13 subspp., Neo-chrysops-1, Merycomyia-2, Chlorotabanus-1, Bolbodimyia-1, Diachlorus-2, Stenotabanus-1, Aegialomyia-3, Chrysozona-3, Glaucops-2, Microtabanus-1, Atylotus-6 plus 2 subspp., Anacimas-3, Agkistrocerus-2, Hamatabanus-3, Leucotabanus-2, Whitneyomyia-1, Hybomitra-52 plus 5 subspp., Tabanus [sens.lat.] [long dash]93 phis 11 subspp. and 3 fossil spp. 13 of these spp. are listed as unrecognized. Specific distr. by states and provinces, and bibliographic references to systematic, biological and ecological information published since Aldrich''s catalog of North American Diptera (1905) are provided, together with other pertinent data regarding synonymy and types. A key to the supraspecific categories is included. Bequaertomyia jonesi is transferred to Pelecorhynchidae.