Dec., 1904.] 
Tabanidae. 
233 
12 . 
13. 
14. 
15 
16. 
17. 
18. 
19. 
20 . 
21 . 
22 . 
23. 
24. 
25. 
26. 
27. 
28. 
29. 
lYhite triangle on the second abdominal segment of the same 
size as on the third and fourth segments. Length about 13 
millimeters coffeatus 
"White triangle on the second abdominal segment much smaller 
than those on the third and fourth segments. Length about 
15 millimeters hyalinipennis 
Palpi clear black, general color of the whole body black 14 
Palpi yellowish 1 5 
Costal cell dark brown procyon 
Costal cell hyaline sequax 
A single narrow' transverse brown band across the eye, no 
ocelligerous tubercle tnsuetus 
No such band across the eye, ocelligerous tubercle usually 
present 16 
"'A'hole body shining black, if there are gray spots on the abdo- 
men there is no red ground color beneath them. Ocelligerous 
tubercle denuded osburm 
"Whole body not black, or if so the subcallus not denuded; some- 
times black with red ground color beneath the gray abdominal 
spots 17 
Each abdominal segment black with a wide irregular gray border, 
wings dilute brownish zonahs 
Abdomen not so marked, wings hyaline or nearly hyaline 18 
Abdomen with a wide middorsal brown stripe and on either side 
of it a gray stripe of about equal width. dodget 
Abdomen not so colored 19 
Abdomen largely black with hree row's of white spots, often 
with red ground color beneath the lateral spots 
Abdomen broadly red on the sides; this color not usually in the 
form of spots 
Antennae black, or at most with a trace of reddish at the base 
of the third segment 
Antennae largely red 
Wing w'ith distinct fuscous on the margins of the cross- veins and 
on the furcation of the third vein. 
Wing with at most only a trace of fuscous on the margins of the 
cross- veins and furcation of the third vein 
Subcallus not denuded in the female Hiatus 
Subcallus denuded in the female 23 
"Venter of the abdomen largely red centron 
"Venter of the abdomen black, covered with gray pollen rhombicus 
Wings reddish hyaline, lateral abdominal spots usualU 
rounded septentrionalis 
Wings clear hyaline, lateral abdominal spots angular and 
oblique 25 
Base of the anterior branch of the third vein with a stump opacus 
Base of the anterior branch of the third vein without a 
stump itensivus 
Basal part of the third segment of the antenna fully as wide as 
long laticorms 
Basal part of the third segment of the antenna longer than wide 27 
No red beneath the lateral gray abdominal spots gilanus 
With red beneath the lateral gray abdominal spots 28 
Head distinctly w'ider than the thorax laticeps 
Head not noticeably widened 29 
Base of the anterior branch of the third vein with a stump frenchii 
Base of the anterior branch of the third vein without a 
stump susurrus 
20 
30 
21 
26 
22 
24 
