HORSEFLIES OF THE SUBFAMILY TABANINAE 53 
birdiei, boreus, brennam, californicus,’ captonis,’ cayensis, coarctatus, 
imitans var. excessus, exilipalpis, frontalis, fulvicallus, atratus var. 
fulvopilosus, fuscicostatus, hearlei, itasca, johnsoni, laticallus, lati- 
cornis, longus, moderator, morbosus, nefarius, petiolatus, philipi, 
quaesitus, septentrionalis, sequax, turbidus, and wiedemanni, 
TABANUS BISHOPPI Stone 
(Fig. 14, A) 
Tabanus bishoppi Stone, Ent. Soc. Wash. Proc. 35: 77, 1933, and 37: 16, 1935. 
Rather small; yellowish brown, with a parallel-sided, yellowish, median stripe 
and subquadrate, sublateral spots on abdomen; eye pilose; ocellar tubercle ab- 
sent ; palpus very slender. 
FicurRE 14.—Antenna, front view of head, and palpus of (A) TYabanus bishoppi and 
(B) T. quaesitus. 
Female.—Length 11-13 mm. Eye with short but distinct white pile, greenish 
blue, with a single, yellow-green, diagonal stripe. Frons about three and one- 
half times as high as width at base, scarcely widened above, yellow, with brown 
hair above median callus, yellow hair below; small, slightly raised spot at 
vertex entirely covered with pollen and hair; basal callus black, shiny, convex, 
subquadrate, and narrowly separated from eyes; median callus black, usually 
very slender and elongate and very narrowly joined to basal callus; subcallus 
flat, pale yellowish. First two antennal segments small, yellowish brown, with 
black hair above; third orange brown, the annulate portion black; basal portion 
stout, its greatest width nearly equal to length, only slightly excised beyond 
obtuse dorsal angle; length of annulate portion equal to width of basal portion. 
Clypeus and genae white, with concolorous hair. Palpus pale yellow, with short 
white and scattered black hair, the second segment of moderate width at base 
but apical half very slender. 
Mesonotum black in ground color, with a very fine coating of yellow pollen 
and an indication of grayish stripes on mesoscutum; hair black and yellow, the 
latter predominating. Pleura, sternum, and coxae dark gray, the fore coxa 
paler than others; upper part of pleura with yellowish hair, the rest white. 
Wing hyaline, the reddish-brown veins darker apically; venation normal. Fem- 
ora gray; tibiae yellow, with yellow hair, the apical third of fore tibia black- 
ened; fore tarsus black, the middle and hind tarsi dark reddish brown. 
Abdomen with a continuous pale-yeliow stripe from base to apex, which 
widens slightly at posterior margin of each tergite; on tergite 1 a black spot at 
each side of stripe, and an indication of black bordering the stripe on other 
tergites, the apex of abdomen largely black; rest of abdominal dorsum rather 
dark orange brown except for a sublateral row of nearly square spots of yellow 
pollen and hair on tergites 1-5, the spots beyond first tergite not touching hind 
margin; venter pale orange, somewhat darker apically. 
WMale.—EHEye densely pilose, the facets nearly uniformly small. Frontal triangle 
gray, distinctly swollen, with a pair of small brown spots at top of swelling, 
which touch eyes. Second palpal segment rather slender, with pale hair. Ab- 
Gomen yellower than in female, the lateral spots somewhat larger. 
Type and paratype—Females, United States National Museum 
No. 49378. 
5The males of californicus and captonis have been described by Philip (17) since the 
completion of this paper. The male of quaesitus has been discovered and its description 
included although it was found too late to be included in the key. 
