1924 ] Notes Upon Surcoufs Treatment of the Tabanidoe 
37 
1. Antennal style four-jointed, rarely three-jointed (in one 
case all the joints fused) Silviinse. 
Antennal style seven-jointed, rarely six-jointed 2 . 
2. Anal cell open Pelecorhynchinse. 
Anal cell closed 3 . 
3. First posterior cell open, rarely closed just at the margin 
Melpiinse. 
First posterior cell closed some distance before the 
margin Pangoniinae. 
The Opisthanoplse he divides into five subfamilies : 
1. Antennal style three-jointed, rarely two-jointed 
Haematopotinse. 
Antennal style four-jointed 2 . 
2. Anal cell open; no ocelli Chasmiinae. 
Anal cell closed, petiolate 3 . 
3. First antennal segment longer than thick; no ocelli 
Diachlorinae. 
First antennal segment about as long as thick 4 . 
4. First posterior cell closed; ocelli always absent . . Bellardiinae. 
First posterior cell open; ocelli sometimes present. Tabaninae. 
Enderlein accepts for the whole of the family Tabanidae 
131 genera, that is three times as many as Surcouf.^ These are 
divided among his nine subfamilies as follows: Pelecorhynchinae, 
2; Melpiinae, 17; Pangoniinae, 22; Silviinae, 25; Chasmiinae, 2; 
Bellardiinae, 5; Tabaninae, 40; Diachlorinae, 8; and Haema- 
topotinae, 10. According to this classification the North and 
Central American species would represent 27 genera, namely: 
Melpiinae: Apatolestes, Osca {Diatomineura) , (and Goniops, 
which was not known to Enderlein). 
Pangoniinae: Pangonius, Rhinotriclista, Scione, Pityocera, 
Fidena, Esenheckia, and Ricardoa. 
Silviinae; Chrysops, Silvius, (and Neochrysops, which was not 
known to Enderlein.) 
Bellardiinae: Bellardia. 
^Quite recently (Deutsch. Ent. Zeitschr., 1923, pp. 544-545) Enderlein 
has briefly defined 21 additional new genera. Of these, Anacimas is based 
upon a North American species. 
