Dec., 1904.] 
Tabanidae. 
241 
Ball, and near Lander, Wyoming, by R. C. Moodie of Lawrence, 
Kansas. Some slight color variations occur, and in many speci- 
mens the antennae are entirely black. The long stump is present 
on the anterior branch of the third vein in all the females. 
Tabanus osburni n. sp. Female; Length 12 to 16 millimeters. 
General color of the body shining black. Eyes pilose, first and 
second segments of the antennae black or they may be partly red- 
dish. clothed with black hairs, third segment black except the 
base which is red, basal portion with a blunt prominence above, 
longer than the annulate portion. Subcallus denuded and shin- 
ing black, frontal callosity shining black with unconnected mark 
above ; ocellar area partly denuded black, remainder of front cov- 
ered with grav pollen; face and cheeks clothed with gray pollen 
and dark vellowish hairs, palpi yellowish with short black hairs; 
thorax with inconspicuous narrow gray stripes above ; pleurae 
clothed with long gray pile. Legs Idack but bases of tibiae show- 
ing a reddish tinge. Wings hyaline but with costal margin and 
narrow margins of cross- veins and furcation of third vein fuscous ; 
these infuscations on the margins of the veins are less conspicuous 
in some specimens than in others. Abdomen black with three 
rows of faint gray spots above and the posterior margin of each 
segment both above and beneath with a fringe of rather long 
white hairs. 
Male: Length 12 millimeters. Like the female except the 
gravish spots on the dorsum of the abdomen appear to be lacking, 
and the third segment of the antennae is noticeably narrower than 
in that sex. This latter character is characteristic of this sex in 
a large number of species. The head is larger and nearer 
hemispherical than in the female. 
A large number of specimens, most of them taken by Prof. 
R. C. Osburn. for whom the species is named. Known from 
British Columbia. Alberta. Montana. Washington and Alaska. 
This species is some like rhoml)icus but more robust and no 
suggestion of red on the abdomen of either sex. 
Tabanus phaenops Osten Sacken. The antennae are black, 
the wings are hyaline and the abdomen is broadly red on the side. 
Length 13 to 14 millimeters. Distributed from Alaska and Brit- 
ish Columbia to California, and specimens are also at hand from 
Wvoming and Colorado. Osten Sacken fully described this spe- 
cies in his paper on ‘ 'Western Diptera” and his description should 
be consulted. 
Tabanus procyon Osten Sacken. The palpi, legs and anten- 
nae, as well as the whole body, are black ; the subcallus is denuded 
and shining black, the wings are hyaline except the costal cell, 
margins of cross-veins and furcation of third vein which are black. 
Length 13 millimeters. Known from California, and specimens 
are at hand from Eldorado collected bv Sarah E. Harris. 
