222 
The Ohio Naturalist. 
[Vol. V, No. 2, 
The male which hitherto has not been described, is much 
darker than the female; the antennae, proboscis and four small 
spots on the face are black; the facial callosities are shining yel- 
lowish, otherwise, the face is covered with gray pollen. Thorax 
dark with gray hairs and well marked gray stripes above; legs 
mostly black with the exception of the middle and hind tibiae, 
which are largely yellow. Wings black with various sized hya- 
line spots in all the cells except the costal, marginal and fifth 
posterior; axillary cell almost altogether hyaline. Abdomen black 
with narrow lateral margins and rather wide posterior margins 
of the segments gray. On the second to the fifth segments the 
posterior border sends forward three extensions besides the lat- 
eral margins. Venter of the abdomen gray with three rows of 
black spots. Length, 10 millimeters. 
Two males, one from Utah and the other from Montana. The 
latter sent in by Prof. R. A. Cooley, who has also contributed 
other material of interest from that State. 
Chrysops excitans Walker. So far as western species of 
Chrysops are concerned this one is readily separated from all 
others by the absence of an apical spot on the wing and the bi- 
colored abdomen. The second basal cell infuscated on more than 
basal half separates it from sordidus of the eastern states. 
Chrysops facialis Townsend. Female: Antennae blackish 
above, yellowish beneath on first two segments; first segment dis- 
tinctly enlarged but not so large as in some related species. 
Facial callosities shining black or dark brown, remainder of face 
yellow. Frontal callo.sity shining black, yellowish on disk. 
Ocellar area large, black, nearlv reaching the eye on either side. 
Thorax black with yellow stri])e on each side above the root of 
the wing ; clothed evervwhere with rather long yellow hairs. Legs 
yellow with joints, aj)ical half or more of anterior tibiae, and all 
the tarsi except metatarsi blackish ; wings with costal margin and 
cross-band black. The hvaline triangle crosses the second vein 
contributing a small spot to the marginal cell, the apical spot fills 
out the apexes of the marginal and first submarginal cells and 
extends into the second submarginal ; otherwise the apex of the 
wing bevond a line from outer end of the stigma to distal end of 
vein separating third and fourth posterior cells is hyaline. Also 
apical half of first basal, two-thirds of second basal, all of the anal 
except apical narrowed part, and all of axillary are hyaline. The 
distal half of fifth posterior cell is infuscated, but not so strongly 
as the basal half. Abdomen black and yellow, black as follows: 
Large s])ot beneath the scutellum, two spots united at l)ase on 
middle of second and third segments, four spots united basally 
on fourth and fifth segments, and all of remaining segments 
except narrow posterior margins. Ventrally a w’ide stripe on 
