152 MISC. PUBLICATION 305, U. S. DEPT. OF AGRICULTURE 
base, gray or yellowish gray, with black hair; basal callus transverse, black, 
rather convex; median callus black, oval; ocellar tubercle indefinite, the whole 
vertex somewhat swollen; subcallus gray, with distinct black hair. Antenna 
black; first two segments with long black hair; basal portion of third rather 
slender, the dorsal angle very small; annulate portion rather stout, about three- 
fourths length of basal portion. Clypeus and genae gray, with black hair, and 
a strong fringe of yellow hair below. Palpus dark reddish, the first segment 
with long black and yellow hair, the second rather slender, with short black 
hair. 
Thorax entirely black, with long black hair and a few yellow hairs above and 
below wing base. Wing hyaline, the costal cell slightly tinged with brown; 
venation normal. Legs black, the tibiae slightly reddish ; hind tibial fringe long, 
black. 
Abdomen above black, a slight reddish or grayish spot on side of second 
segment; hind margins of segments with a thin line of yellowish-white hair 
which may form a median row of small triangles; venter black, with trace of a 
yellowish fringe on each sternite. 
Male—Facets of eye nearly uniform in size, with no distinct line of differen- 
tiation. Coloration essentially as in female but hair of head entirely black. 
Type.—A. female in the Canadian National Collection. Paratypes 
of both sexes in the Canadian National Collection; a paratype in the 
Museum of Comparative Zoology. 
Type locality —Banff, Alberta. 
Distribution—Mountains from Alaska to Colorado. June 12 
(Mount McLaine, British Columbia) to September 15 (Jasper Park, 
Alberta). Inthe United States National Museum, 31 females. 
TABANUS LATICALLUS Philip 
CHigs 74; A) 
Tabanus laticallus Philip, Canad. Ent. 68: 150-151, 1936. 
Small; blackish, the abdomen with three rows of gray spots; wing hyaline: 
prescutal lobe black; ocellar tubercle distinct: frons broad; basal callus trans- 
verse; subcallus pollinose; palpus stout, with black hair. 
FIGURE 74.—Antenna, front view of head, and paipus of (A) Tabanus laticallus, (B) 
T. rhombicus, and (C) 7. fretus. 
Female—Length 12 mm. Eye indistinctly pilose (probably rubbed), purple, 
with four green bands. Whole head gray, the clypeus and genae with white 
hair. Frons twice as high as wide, with parallel sides; basal callus dark 
brown, paler medianly, about two and one-half times as wide as median height 
but higher at sides, merging laterally with median callus and leaving a pollinose 
median patch between the two calli; ocellar tubercle distinct, orange brown}; 
subeallus somewhat swollen, with deep median sulcus. Antenna dark, the first 
two segments tinged with brownish and the third with some orange at extreme 
base; first segment short and stout; third short, with indistinct dorsal angle and 
no excision. Palpus creamy white, the second segment somewhat swollen 
basally, rather acute apically, with mixed white and black hairs. Proboscis 
short, the labellae large. 
Mesonotum blackish, with five gray lines in the usual pattern; prescutal lobe 
nearly black. Pleura, sternum, and coxae dark gray, with white hair and some 
black hair on upper pleura. Wing hyaline, the venation normal. Legs dark 
brown, the extreme base of fore tibia and all but apices of middle and hind 
tibiae yellowish brown; hind tibial fringe black. 
Abdomen black above, with three rows of prominent gray spots, the median 
triangles indistinct in type specimen; sublateral spots wth inner margins nearly 
