HORSEFLIES OF THE SUBFAMILY TABANINAE 157 
Female.—Length 13-16 mm. Eye with short, fine pile. Frons gray tinged 
with yellow brown, two and three-fourths to three and three-fourths times as 
high as width at base, widened to about middle and then slightly narrowed; 
basal callus chestnut brown, nearly square; median callus a dark-brown to 
black, usually depressed line attached to basal callus and of about equal 
length; a bare, vertical, oblong spot at vertex bearing an indistinct ocellar 
tubercle; subcallus slightly swollen, pollinose, concolorous with frons. Antenna 
orange brown, the annulate portion black and basal portion outwardly dark- 
ened ; first two segments with black hair, the first rather short but not greatly 
enlarged above; third slender, the dorsal angle either very indistinct or 
distinct but short; annulate portion stout, somewhat shorter than basal por- 
tion. Clypeus and genae gray, with white hair. Second palpal segment yel- 
lowish brown, with black hair, stout at base, but tapering to a slender apex. 
Proboscis short. 
Mesonotum, including prescutal lobe, black, with gray lines in usual pattern. 
Pleura, sternum, and coxae gray, with white hair. Wing hyaline, the costal 
cell and vein margins often faintly washed with yellowish; veins dark brown, 
Figur 76.—Antenna, front view of head, and palpus of (A) Tabanus microcephalus 
and (B) T. brennani. 
the venation normal. Legs almost uniformly dull orange brown, the fore 
tibia with some white hair on basal two-thirds and black hair apically; other 
tibiae with mixed black and white hair, but no pronounced tibial fringe. 
Abdomen above black tinged with brown laterally and with three rows of 
gray spots; these spots rarely touch anterior margin of tergites, are largest on 
second tergite where the sublateral spots broadly join hind margin, and are 
progressively smaller behind this; venter reddish brown to nearly black. 
Male.—Hye with dense, short pile, the facets of nearly uniform size. Colora- 
tion essentially as in female. 
Type.—A female from the White Mountains collected by S. H. 
Scudder, one of four female and one male cotypes in the Museum of 
Comparative Zoology, No. 4028, herein designated as the lectotype. 
Type locality—White Mountains, N. H. 
Distribution.—Minnesota and Maine to Ohio and North Carolina. 
July 6 (Big Indian Valley, Catskill Mountains, N. Y.) to September 
15 (Rostrevor, Ontario). In the United States National Museum, 
21 females, 2 males. 
TABANUS BRENNANI, new species 
(Fig. 76, B) 
Rather small; grayish, with three rows of spots on abdomen, the sublateral 
spots surrounded by yellowish brown; legs dull reddish brown; antenna pre- 
dominantly orange; subeallus pollinose. 
Female.—Length 14 mm. Eye with dense, long pile. Frons gray, about three 
times as high as basal width, slightly widened above; basal callus dark brown, 
about one and one-half times as wide as high, touching eyes; median callus 
black, lancevlate, narrowly joined to basal callus; ocellar tubercle small, yellow- 
ish brown; subeallus concolorous with frons. First two antennal segments 
yellow brown, with black hair; third orange, the upper margin beyond dorsal 
angle blackened and annulate portion slightly darker; basal portion rather 
stout, the dorsal angle distinct but obtuse, the excision slight. Clypeus and 
genae gray, with white hair, the upper genae tinged with yellowish, and with a 
few black hairs. Palpus yellowish brown, with mixed black and white hair; first 
segment somewhat larger than usual; second stout basally, tapering to rather 
