230 
The Ohio Naturalist. 
[Vol. V, Xo. 2, 
and Williston made no comparison with it when he descried pol- 
linosus. However the latter author, in the Tenth Volume of 
Transactions of the Kansas Academy of Science, recognizes both 
species and says of quadrivittatus: “The species differs from 
pollinosus in being darker throughout, in the antennae being more 
slender, in the dorsum of the thorax having gray stripes on a 
black ground, and in the four abdominal stripes being better 
marked.” Type from “Xear the Rocky Mountains.” Male col- 
ored like the other sex. Length 7 to 10 millimeters. 
Apatolestes Williston. 
Specimens belonging to this genus look some like members 
of the genus Tabanus, but have spurs at the apex of the posterior 
tibiae, a character which places it in a different subfamily from 
that to which Tabanus belongs. The genus was described by 
Dr. 'Williston in 18S5. 
Apatolestes comastes Williston. In a long series of specimens 
of the species from California and Arizona, most of them collected 
by Coquillett, I find some variations. The size varies from 8 to 
17 millimeters. vSome specimens are quite black while others 
are gray from being covered with dense gray pollen and some of 
the males have reddish on the sides of the second and third 
abdominal segments. The first two segments of the antennae 
are usuallv covered with gray pollen while the last segment is 
black and ocelli are prominent in both sexes. In the female the 
front is “rather wide and, differing from many species of its sub- 
familv, is narrowest at the vertex and gradually widens toward 
the face. There is some variation but in most specimens there 
is a narrow pollinose space just above the antennae, after which 
the Avhole front is mostly shining black. 
Apatolestes eiseni Townsend, from Lower California seems to 
be a synonym. 
SxowiELLUs n. gen. 
Front rather wide, narrowest at the vertex and gradually 
widening toward the antennas. Antennas inserted beneath the 
middle of the eyes, proceeding from beneath the swollen sub- 
callus, first segment normal on upper side but strongly produced 
downward, second segment small, third segment elongate some- 
what enlarged at the base but with only an indication of a basal 
process. All the tibiae enlarged and the hind pair distinctly cili- 
ate outwardlv. Anterior branch of the third vein without a 
stump at base, its distal end meeting the costa at the first third 
of the distance from where the second vein meets the costa to the 
apex of the wing. 
Snowiellus atratus n. sp. General color black with the ex- 
treme apex of the wing hyaline. A gray pollinose patch beneath 
