1946] 
55 
Tabanidae of Colombia 
slender. §ubepaulet bare, without macrotrichia. Up- 
per branch of third vein turned abruptly forward, 
joining the costa closer to the second vein than to 
the wing apex. Face much swollen at insertion of 
antennae Bolbodimyia. 
First antennal segment not inflated, normal 12. 
12. Base of third antennal segment with a long, slender, 
usually finger-shaped process reaching close to or 
even beyond the first terminal annulus 13 . 
Base of third antennal segment with or without dorsal 
angle or with a broad tooth which extends at most 
midway to the base of the first terminal annulus 16. 
13. Subepaulet completely covered with macrotrichia. Fore 
tibiae not inflated. Eyes bare Alliomma. 
Subepaulet either bare or rarely with a few macro- 
trichia over a small area only 14. 
14. Body very stout, often densely hairy. At least fore tibiae 
inflated, often strongly so; hind tibiae densely fringed 
with long hairs. Eyes bare Stibasoma. 
Body not especially stout nor hairy. Tibiae not appre- 
ciably inflated, at most with a few scattered long 
hairs 15. 
15. Eyes pilose or pubescent in both sexes, the hairs some- 
times short, scattered and easily overlooked. Isa- 
bella small and compact, without shiny, sclerotized 
areas Dasy chela. 
Eyes bare in both sexes. Labella more or less sclerotized 
and shiny Dichelacera. 
16. All tibiae strongly inflated 17. 
Tibiae normal. Palpi dull and hairy 19. 
1 7. Palpi normal, dull, hairy. Subcallus dull, pollinose. Bas- 
al division of third antennal segment scarcely longer 
than terminal annuli, with a strong, broad tooth. Sub- 
epaulet covered with macrotrichia Stigmatophthalmus . 
Palpi flattened, shiny, bare. Subcallus denuded, shiny 18. 
18. Third antennal segment with basal division long and 
wide, nearly four times as long as terminal annuli, 
provided with a very short, broad tooth. Subepaulet 
covered with macrotrichia. Body without metallic 
green scales Selasoma. 
Third antennal segment with basal portion narrow, with- 
