HORSEFLIES OF THE SUBFAMILY TABANINAE 137 
TABANUS HAEMAPHORUS Marten 
(Fig. 65, B) 
Tabanus haemaphorus Marten, Canad. Ent. 14: 210-211, 1882; McDunnough, 
Canad. Ent. 58; 141, 1921. 
Medium sized; orange brown, the orange on side of abdomen extensive, reach- 
ing to anterior margin of first tergite; subcallus pollinose; third antennal seg- 
ment not strongly excised and with some orange basally; frons broad and 
distinctly widened above. 
Female.—Length 16-17 mm. Eye densely pilose, deep purple, with four bluish- 
green bands. Frons gray tinged with yellow, three to three and one-half times 
as high as width at base, somewhat widened above; basal callus dark brown, 
square or slightly wider than high, rounded above; median callus black, joined 
by a narrow line to basal callus and to the orange ocellar tubercle; subcallus, 
clypeus, and genae gray, the upper genae with black hair, lower genae and 
clypeus with cream-colored hair. First two antennal segments yellowish 
brown, with black hair; third orange proximad of dorsal angle, black distally ; 
basal portion moderately stout, with a moderate dorsal excision; annulate 
portion slightly longer than width and shorter than length of basal portion. 
Second palpal segment stout, creamy white, with black hair. 
Mesonotum brownish black, with gray lines in usual pattern; prescutal lobe 
orange; rest of thorax and coxae dark grayish, with a mixture of dark and 
cream-colored hairs. Wing hyaline, the costal cell, furcation, cross veins, and 
anterior longitudinal veins faintly margined with brown; femora dark gray, 
tinged with orange apically ; tibiae orange, the apex of fore tibia darkened ; fore 
tarsus darkened, the others nearly concolorous with tibiae; hind tibial fringe 
prominent, black. 
Abdomen above orange, with a median black stripe widening posteriorly on 
which lies a median row of small yellowish spots, that on tergite 2 sometimes 
reaching anterior margin; orange on sides of first tergite reaching to anterior 
margin; venter dull orange, darkened apically and medianly. 
Male.—HKye with dense brown pile, the facets nearly uniform in size; third 
antennal segment black except at extreme base; palpus yellowish brown, with 
a mixture of long black and white hairs, the second segment stout, about 
twice as long as greatest width, with an acute apex. Fore tibia nearly uni- 
formly dark brown; fore tarsal claws subequal in length. Sternites 24 
entirely orange, the first with a median black spot and 5-7 largely black. 
Described from a specimen collected at Poudre River Canyon, 
Colo., June 28, 1931, by L. D. Anderson, in the collection of C. B. 
Philip. 
Tee eae females, lost. 
Type locality —California. 
Distribution —British Columbia to California and Colorado. May 
30 (Mount Lehman, British Columbia) to August 15 (Kaslo, British 
Columbia). In the United States National Museum, 20 females. 
TABANUS AFFINIS Kirby 
(Fig. 66, 4) 
Tabanus affinis Kirby, Fauna Boreali-Americana, v. 4, pp. 3138-314, 1887; Osten 
Sacken, Mem. Boston Soe. Nat. Hist. 2 (pt. 4, No. 4) : 466, 1876; Bethune, 
Canad. Ent. 13: 166-167, 1881 (compiled from Kirby) ; Hine, Ohio Nat. 5: 
234, 1904; McDunnough, Canad. Ent. 58: 141, 1921; Philip, Minn. Agr. 
Expt. Sta. Tech. Bull. 80: 102, 19381. 
Tabanus triligatus Walker, List of the Dipterous Insects in the Collection of 
the British Museum, pt. 5, sup. 1, pp. 183-184, 1854. 
Largest species, in our fauna, of the group with eye pilose and ocellar tubercle 
present ; abdomen with orange laterally ; wing hyaline. 
Female.—Length 16-19 mm. Eye with dense, short pile, deep purple, with 
four blue-green diagonal bands. Frons about three and one-half times as 
high ag width at base, somewhat widened above, yellowish brown, with short 
black hair; basal callus black or dark reddish, subquadrate, not quite touch- 
