10. 
iiske 
19..:, 
20. 
_Abdomen narrowly. or, obsoletely reddish on the sides - _ carolinensis. 
oie 
~*~ Prevailing color of the thorak and abdomen. Dlack, “thinly 
TABANIDA OF OHIO. |: 4:7 
Prevailing color of the abdomen black, 
Prevailing color of the abdomen reddish brown 8- 
Segments two to five with small gray triangles superjumentarius. 
Segments three to five with large gray triangles, no triangle 
on the second segment trimaculatus. 
Abdominal segments two to five with me dtiten sized gray 
triangles, wing of female whitish on the disk, all the 
facets of the eyes of the male of nearly the same size variegatus. 
Abdominal segments two to five with large gray triangles, 
wing of the female not whitish on the disk, large and 
small facets of the eyes of the male distinctly differen— 
tiated sulcifrons. 
The gray spots on the sides of the abdominal segments are 
small and do not touch the hind margin il). 
The gray spots on the sides of the abdominal segments are 
large and touch the hind margin Il. 
Third antennal segment long and narrow, prevailing color 
of the abdomen reddish brown longus. 
Third antennal segment rather short and wide, prevailing 
color of the abdomen black pumilus. 
Gray stripes on the thorax plainly reaching the scutellum vivax. 
Gray stripes on the thorax obsolete behind MVOSUS. 
Thorax uniformly yellowish pollinose, costal cells yellow costalis. 
Thorax dark colored with gray stripes, costal cells hyaline lineola 
Whole body including the wings black atratus. 
Whole body including the wings not black 14. 
Abdomen black, wings brownish with a darker spot at the 
bifurcation of the third vein stygius. 
Abdomen brownish, no dark spot at the bifurcation af the 
third vein 15. 
Wings hyaline except the costal cells which are brown americanus, 
Wings uniformly brownish giganteus. 
Cross veins and bifurcation of the third vein margined with 
brown : ie 
Cross veins and bifurcation of the third vein not margined 
with brown 18. 
’Rather large, grayish species; abdomen: not distinctly reddish 
on the sides reinwardtu. 
Medium sized, abdomen’ broadly reddish on the sides Jastophthalmus. 
Third antennal segment deeply excised making the basal pro- 
cess long, general color chocolate. brown ‘” cerastes. 
Third antennal: segment not deeply excised 19. 
Medium sized species, -ocelligerous tubercleipresent . |; 20. 
Rather small species, no ocelligerous tubercle teas Srtnrhey ~ ede 
Abdomen broadly and distinctly reddish on the sides ~:. eprstatus, 
Preyailing color of the whole body bright yellowish bicolar. 
dusted with’ grayish ‘pollen: M8 |" ohioensis. 
