70 MISC. PUBLICATION 305, U. 8S. DEPT. OF AGRICULTURE 
Female.—Length 12-15 mm. Eye bare, purple, with two green bands. Frons 
yellowish brown, grayer above, about four times as high as width at base, 
slightly widened above; basal callus shiny, chestnut brown, usually touching 
eyes and slightly higher than wide; median callus narrow, longer than basal 
callus and joined to it; subcallus yellowish. First antennal segment yellowish, 
moderately swollen above, with short black hair; second segment and basal 
portion of third orange, annulate portion black; basal portion moderately stout, 
with a distinct dorsal angle and shallow excision; annulate portion slightly 
longer than width of basal portion. Clypeus and genae gray, with concolorous 
hair. Second palpal segment creamy white, moderately stout at base, with 
short black hair. 
Mesonotum dull brown, with an indication of paler lines in usual pattern. 
Pleura, sternum, and coxae gray, with concolorous hair. Wing hyaline, with a 
faint brownish spot at furcation; venation normal. Fore femur, apical half of 
fore tibia, and tarsi dark brown, with dark hair; legs otherwise yellowish, with 
pale hair, and with scattered black hair on middle and hind tibiae. 
Dorsum of abdomen dull orange brown, with a median row of pale-grayish 
triangles which usually reach the length of the tergites, and oblique, sublateral 
spots touching hind margins of tergites. Venter grayish brown, with a broad, 
median, darker stripe. 
Male.—Areas of large and small facets of eye sharply differentiated. Colora- 
tion essentially as in female, but femora darker. 
Type—Female, in the collection of C. B. Philip. Allotype male 
in the Ohio State Museum; paratypes in these collections and in the 
Canadian National Collection, the United States National Museum 
(No. 51965), the Rocky Mountain Spotted Fever Laboratory, Hamil- 
ton, Mont., the University of Kansas, the California Academy of 
Sciences, the Museum of Comparative Zoology, and the University 
of Texas. 
Type locality —FKastland County, Tex. 
Distribution—¥rom Kansas to Texas and Arkansas. May 4 (So- 
nora, Tex.) to October 9 (Pearsall, Tex.). In the United States 
National Museum, 56 females, 7 males. 
This is apparently one of the most troublesome species in the region 
where it occurs, and under the name of 7abanus gracilis Wiedemann 
it has been reported by Sanborn, Stiles, and Moe as a possible vector 
of anaplasmosis of cattle. 
TABANUS TEXANUS Hine 
(Fig. 24, A) 
Tabanus texanus Hine, Ohio Nat. 8: 228, 1907; Philip, Ohio Jour. Sci. 36: 
155, 1936. 
Rather small; yellowish brown, with three rows of pale-yellowish triangles 
on abdomen, the median triangles, at least, contiguous; costal cell infuscated ; 
coxae yellow; frons broad. 
Female.—Length 10-14 mm. Eye bare, green, with a diagonal purple band 
from inner angle which does not reach outer margin. Frons yellowish gray, 
about two and two-thirds times as high as basal width, with nearly parallel 
sides; basal callus shiny black, slightly transverse and somewhat protuberant ; 
median callus black, rather short and broad, rarely joined to basal callus; 
subeallus yellowish gray. First two antennal segments yellow, with black hair, 
the first not enlarged; basal portion of third yellow orange, sometimes with 
an indefinite, longitudinal, black stripe on middle of outer surface; dorsal 
angle prominent and dorsal excision moderate; annulate portion black, about 
as long as basal portion. Clypeus and genae nearly white, with white hair. 
Second palpal segment moderately stout at base, tapering to an acute apex, 
creamy white, with concolorous hair and often with many black hairs. 
Mesoscutum and scutellum with dull greenish-yellow pollen and hair, the 
mesoscutum often with three darker longitudinal stripes; prescutal lobe tinged 
with orange. Pleura, sternum, and coxae yellowish gray, with pale hair. Wing 
hyaline, the costal cell yellow orange; venation normal. Femora yellowish 
