148 MISC. PUBLICATION 305, U. S. DEPT. OF AGRICULTURE 
Abdomen black, with three rows of gray spots above and incisures, both 
above and below, narrowly grayish; spots rather’ indistinct, the median triangle 
or tergite 2 large, reaching nearly to anterior margin, the sublateral spots 
reaching about half way; venter with white hair. 
Male.—Unknown. 
T'ype.—A female, United States National Museum No. 519738. Para- 
types, females, United States National Museum No. 51973. 
Type locality —Longitude 141°, latitude 69°10’, Alaska. 
Both specimens were collected August 14-17, 1912, by J. M. Jessup. 
The paratype was determined by Hine as Vabanus osburni, from 
which it differs in its pollinose subcallus, yellowish ocellar tubercle, 
brownish basal callus, and entirely hyaline wing. 
FIGURE 71.—Antenna, front view of head, ane palpus of (A) Tabanus boreus and (B) 
. typhus. 
TABANUS TYPHUS Whitney 
(Fig. 71, B) 
Tabanus typhus Whitney, Canad. Ent. 36: 206, 1904; Bequaert, Boston Soc. Nat, 
Hist. Occas. Papers 8: 87, 1983; Philip, Canad. Ent. 68: 154, 1936. 
Rather small; black, with three rows of gray spots on abdomen, often tinged 
with reddish laterally; prescutal lobe reddish; antenna brownish or orange, 
the base of third segment rather stout; subcallus pollinose; palpus rather 
slender, with short hair. 
Female—Length 10-18 mm. Eye sparsely pilose, deep purple, with four 
green-blue bands, upper one slightly wider than others and two middle ones 
about equal in width to intervening- purple band. Frons gray tinged with 
yellowish brown, two and one-half to three times as high as width at base, 
slightly widened above; basal callus subquadrate, shiny, dark orange brown to 
black, and narrowly separated from eyes; median callus black, short, narrow, 
tapering at both ends and usually not connected with basal callus; ocellar 
tubercle orange brown, distinct; subcallus gray. Antenna orange brown, the 
annulate portion and apical part of basal portion of third segment darkened ; 
first segment small, with black hair; basal portion of third with a distinct dorsal 
angle, the dorsal excision slight, its width about four-fifths its height; annulate 
portion stout, slightly shorter than basal portion. Clypeus and genae gray, with 
white hair. Second palpal segment rather slender, creamy white, with short 
black and white hair. Proboscis slightly longer than palpus. 
Mesonotum black, dark grayish on sides and below, at least the prescutal 
lobe tinged with reddish and the mesoscutum with five slender gray lines; hair 
on pleura mixed black and white. Wing hyaline, the costal cell brownish 
and veins often margined basally with brown and a faint spot at fureation. 
Legs black, except for middle and hind tibiae and base of fore tibia, which 
are tinged with orange brown. 
Abdomen above black, with three rows of gray triangles, the median one on 
second tergite occasionally reaching anterior margin, the others not extending 
over half way; sublateral, oblique triangles often tinged with reddish; gray 
hind margins of tergites very narrow; venter dark gray, with narrow light- 
gray incisures. 
Male.—Eye densely pilose, the areas of large and small facets rather dis- 
tinctly differentiated; palpus slender, orange brown. Body coloration essen- 
tially as in female. 
Type.—Specimen collected July 8, one of two cotype females in 
the Museum of Comparative Zoology, No. 17060, herein designated 
