46 OHIO STATE ACADEMY OF SCIENCE. 
GONIOPS CHRYSOCOMA Osten Sacken. 
Length 12-14 mm. Abdomen short and wide; legs pale; wings: 
hyaline at base and on part of posterior margin, otherwise dark almost 
black in fully matured specimens. . 
Female: Body entirely pale yellowish although some specimens. 
show a brownish tinge on dorsum of thorax and abdomen, posterior 
margins of abdominal segments clothed with silvery white hair; face 
and front wide, eyes small, and pointed above, a line along the inner side 
of each from the most inferior to the most superior points is very nearly 
a straight line; proboscis much shorter than the head, palpi nearly as. 
long as the proboscis. 
Male: Thorax black above with two narrow longitudinal stripes, 
abdomen black with a tinge of reddish on the sides and with narrow 
posterior margins to the segments; clothed with pale yellowish pile. 
Habitat: Northern and Southern Ohio. 
I have taken both sexes of this species from foliage, but have 
not observed the female around stock. The peculiar dark mark- 
ings on the wings of both sexes and the form of the eyes and 
wide front in the female will serve to distinguish this species. 
from all others of the family in our fuana. 
TABANUS Linne. 
Fauna Suecica, 1761. 
In this genus the markings of the abdomen are much used 
for distinguishing species. The term gray markings as used in 
the key below refer to the rows of triangles and to the stripes, 
and not to the gray margins of the various segments. The males. 
and females of the same species in this genus are very much 
alike in coloration, so it does not appear necessary to construct 
a separate key for each sex. 
Key to the species. 
1. Eyes bare 2 
Eyes pilose 16. 
2. Abdomen with definite gray markings ere 
Abdomen not with definite gray markings 13.. 
3. The gray markings of the abdomen consist of a single longi— - 
tudinal row of triangles 4 
The gray markings of the abdomen consist of three longi- 
tudinal rows of triangles or spots 19. 
The gray markings consist of a middorsal stripe running from 
the scutellum to the end of the abdomen, and usually an 
additional stripe on each side 12. 
4. Wing uniformly hyaline, but the stigma brown cofteatus. 
- Wing smoky on basal part or with distinct spots of brown, at’ 
least along the cross veins and bifurcation of the third’ vein Pas 
5. Wing with distinct brown patches other than along the cross. *:. 
., veins and the bifurcation. of the third, vein venustus, 
Wing without distinct brown except along the margins of the _.. 
cross veins and bifurcation of the third vein : 08 
