230 The Ohio Naturalist. [Vol. Y, No. 2, 



and Williston made no coinparison 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 

 poUinosus 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 "Near the Rocky Mountains." Male col- 

 ored like the other sex. Length 7 to 10 millimeters. 



Apatolestes AA^illiston. 



Specimens belonging to this genus look some like members 

 of the genus Tabanus, but have spurs at the apex of the posterior 

 tibiffi, a character which places it in a different subfamily from 

 that to which Tabanus belongs. The genus was described bv 

 Dr. Williston in 1,S,S5. 



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. Some specimens are ciuite black while others 

 are gray from being covered with dense gray pollen and some uf 

 the males have reddish on the sides of the second and third 

 abdominal segments. The first two segments of the antennae 

 are usually 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- 

 family, 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 w^hole 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 antennae. Antennae inserted beneath the 

 middle of the eyes, proceeding from beneath the swollen sub- 

 callus, first segment normal on upper side but strong!}- 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 outwardly. 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 jjollinose patch beneath 



