HORSEFLIES OF THE SUBFAMILY TABANINAE 141 
First antennal segment stout and somewhat enlarged apically, gray, with pale- 
yellowish and black hair and a distinct tuft of reddish hair at apex above; third 
rather stout, with a strong dorsal angle and distinct dorsal excision; basal third 
to half of basal portion dark reddish brown to nearly black, the rest black; 
annulate portion stout, about equal in length to width of basal portion at dorsal 
angle. Clypeus, genae, and back of head pale yellowish gray, with abundant, 
long, nearly white hair; posterior orbital fringe of hair, to each side of vertex for 
a short distance, distinctly yellowish orange. Second pa!lpal segment short, stout, 
swollen at base, and coming to a sharp apex, pale yellow, with long, nearly white 
hair. Proboscis very short, the labellae black. 
Mesonotum black, with abundant, long, silky, pale-yellowish or brownish 
hair; prescutal lobe black, with shorter black hair. Pleura, sternum, and 
coxae gray, densely clothed with long, nearly white hair. Wing hyaline, with 
black veins, the costal cell often somewhat infuscated; venation normal. Legs 
with femora black, the under surface, particularly of fore femur, with abund- 
ant, long, yellowish hair; tibiae dark reddish, the fore tibia with apex black; 
all tibiae with a mixture of pale and black hair; hind tibial fringe not prom- 
inent; tarsi black, the ventral surface with short bright-orange hair. 
Abdomen above broad, black, with pale-yellowish and black hair, the pale 
hair forming rather indefinite posterior margins to the tergites; these bands 
expand at lateral margins of each tergite and sometimes form faint median 
triangles; venter gray, the posterior margin of sternites somewhat paler, 
Male.—Eye densely pilose, the facets nearly uniform in size; a row of heavy 
black hairs between eyes; frontal triangle protuberant, with gray pollen; 
first antennal segment very stout, grayish, with long black hair; third black 
except at extreme base; second palpal segment stout, pale yellowish, with 
concolorous hair. Legs black, the tibiae yellowish; outer claw of fore tarsus 
distinctly longer than inner claw, the basal half distinctly pilose below. Ab- 
domen dull blackish, with a pale spot at lateral margin of second sternite. 
Described from a topotype in the American Museum of Natural His- 
tory, collected by A. E. Pritchard, April 26, 1934. 
Type—Female, United States National Museum No. 49377. Para- 
types, United States National Museum No. 49377. 
Type locality —Atoka, Okla. 
Distribution.—Johnson and Atoka Counties, Okla., March 31 to 
April 26 (Atoka). In the United States National Museum, 17 
females. 
The presence, in the male, of coarse hair between the eyes fur- 
ther confirms the relationship of this species to carolinensis. 
This interesting species occurs in considerable abundance in a ver 
local area and for a relatively short period early in the spring. tt 
has been studied by Sanborn in connection with its possible trans- 
mission of anaplasmosis of cattle. 
TABANUS SEXFASCIATUS Hine 
(Fig. 68, 4) 
Tabanus sexfasciatus Hine, Canad. Ent. 55: 144, 145, 1923; Stone, Ent. Soc. 
Wash. Proc. 37: 18, 1935. 
Tabanus borealis authors (not Fabricius). 
Rather small; blackish, with narrow, posterior, pale bands on tergites; palpus 
slender; black hair on hind tibia. 
Female.—Length 13-14 mm. Bye densely pilose, coppery, with four blue 
bands, the ventral one margining bottom of eye. Frons, subcallus, clypeus, 
and genae gray, occasionally with a faint tinge of yellow; frons black haired, 
about two and one-half times as high as width at base, with nearly parallel 
sides; basal callus somewhat transverse, nearly touching eyes, dark reddish 
brown to black; median callus spindle shaped, black, usually connected to basal 
callus and sometimes joined to ocellar tubercle by a dark line; ocellar tubercle 
prominent, sharply defined, reddish brown. First two antennal segments black, 
with black hair, the first somewhat expanded apically and about twice as long 
