HORSEFLIES OF THE SUBFAMILY TABANINAE 147 
Female.—Length 12-15 mm. Eye finely pilose, deep purple, with four green- 
blue bands, the two middle ones considerably narrower than other two or purple 
band between them. Frons about two and one-half times as high as width 
at base, slightly narrowed at basal callus, gray or yellowish gray, with black 
hair; basal callus square or slightly wider than high, convex, shiny black or 
dark brown, usually as wide as frons; median callus slender, about equal in 
height to basal callus and usually separated from it; ocellar tubercle prominent, 
orange brown to black; subcallus, clypeus, and genae gray tinged with yellow, 
the hair yellowish gray. First two antennal segments black, with gray pollen 
and black hair; third black to dark brown, more or less orange on basal por- 
tion, which is of medium width, only slightly excised above, the dorsal angle 
obtuse; annulate portion rather stout, shorter than basal portion. Second 
palpal segment rather slender, dark yellowish brown, with long black hair 
and a few scattered pale hairs near base. 
Mesoscutum nearly black, with longitudinal lines of gray pollen and yellowish 
hair; prescutal lobe and scutellum black. Pleura, sternum, and coxae gray, 
with grayish and black hair. Wing nearly hyaline; costal cell scarcely darker ; 
base of vein Rs occasionally with a short stump; furcation with a very faint 
spot. Legs dark brown to black; fore tibia at base and middle and hind femora 
and tibiae usually with some yellowish hair; hind tibial fringe black. 
Abdomen above black, with three distinct gray triangles on hind margin of 
each tergite; each sublateral spot oblique, with outer angle produced toward 
lateral margin and there widened; median triangles quite prominent; venter 
yellowish gray, with paler incisures. 
Male.—EKye densely pilose, the facets not sharply differentiated into two 
sizes. General coloration as in female but body somewhat darker and abdom- 
inal spots smaller and somewhat reddish. Costal cell of wing somewhat infus- 
cated and brown stigmal spot prominent. Abdomen rather peculiarly shaped, 
being parallel-sided for the first four segments and then coming rather sharply 
to a point. 
Type.—A female cotype labelled “White Mts.” in the Museum of 
Comparative Zoology, No. 4029, labelled and herein designated as 
lectotype. Of the other four cotypes, one from western New York is 
conspecific while the other three, two from Southington, Conn., and 
one from North Conway, N. H., are not the same, but are Z'abanus 
typhus Whitney. 
Type locahty—White Mountains, N. H. 
Distribution.—British Columbia to Labrador and New Hampshire. 
July 17 (Lake Nipigon, Ontario) to September 1 (base of Mount 
Tree, N. H.). In the United States National Museum, 17 
emales. 
TABANUS BOREUS, new species 
(igs tal vA) 
Medium sized; black, with three rows of gray spots on abdomen; antenna 
black; palpus rather slender. 
Female—Length 15 mm. Eye pilose. Frons gray, with black hair above, 
whitish hair below, nearly two and one-half times as high as width at base, 
with nearly parallel sides; basal callus chestnut brown, nearly twice as wide 
as high, not quite touching eyes; median callus small, irregular, connected 
with basal callus by narrow line; ocellar tubercle large, yellowish brown. 
Subeallus, clypeus, and genae concolorous with frons; clypeus and genae with 
white hair. First two antennal segments dark gray, with mixed black and 
white hair; third black, the basal portion slender, with low, obtuse dorsal 
angle and no dorsal excision. Palpus creamy white, with long white hair; 
second segment slender, with a few scattered black hairs. 
Mesonotum, including prescutal lobe, black, an indication of five gray lines on 
anterior margin; type specimen with humerus and region above wing base 
tinged with brownish; in paratype the humerus dark. Pleura, sternum, and 
coxae black, the hair mostly white. Wing entirely hyaline, with dark-brown 
veins; venation normal. Legs brownish black, the tibiae somewhat lighter than 
the femora; hind tibial fringe concolorous with tibia, the hairs long but 
irregular. 
