TABANIDA OF OHIO. 45 
The most abundant and widespread species in this section. 
‘The females are troublesome to stock, and are commonly ob- 
served on horses and cattle with their abdomens filled with blood. 
‘The males have been procured along the margin of ponds and on 
various kinds of flowers. 
PANGONIA Latreille. 
Hist. Nat. des Crust. et des Ins. III, 16802. 
Only a single species of this genus has been taken in Ohio 
up to the present time. Two others have a range such that they 
may be considered as probably belonging to our fauna. These 
three are considered in the key below. "The males and females 
are so much alike that a single key will serve for both sexes. 
Key to the species. 
1. Antennae dark 2. 
Antennae light reddish or yellow - pigra. 
2. Hind borders of the abdominal segments with gray hairs rasa. 
Hind borders of the abdominal segments with golden-yellow 
hairs tranquilla, 
PANGONIA RASA Loew. 
Length 11-13 mm. A brownish species with the hind margins of 
the abdominal segments white; femora light brown, tibiae and tarsi 
darker; first two segments of the antennae brown with black hairs, third 
segment nearly black; wings pure hyaline with brown stigma. 
Female: Thorax distinctly gray with three darker longitudinal 
vittae; abdominal segments ‘with distinct gray margins which in some 
cases expand into median triangles, most distinct on the second segment; 
proboscis slightly longer than the height of the head nearly black in color, 
‘maxillary palps yellowish, the terminal segment pointing downward and 
slightly forward, half as long as the proboscis. 
Male: General color darker than in the female, the posterior 
margins of the abdominal segments narrower and consequently less prom— 
inent than in the female and with no trace of a median triangle on any of 
the segments; proboscis about as long as the height of the head, palpi 
darker than in the female with the terminal segment pointing almost 
directly forward. 
Habitat: Northern and Southern Ohio. 
I have taken both male and female on flowers, but have never 
observed the female around stock. 
coNniops Aldrich. 
Psyche VI, 236, 1892. 
There is only one species in this genus. So far as our species 
of this group are concerned, the genus appears to be sufficiently 
characterized, but a full knowledge of Central and South Ameri- 
can forms is necessary before conclusive results can be reached in 
the sub-family. 
