Dec., 1907.] 
New North American Tabanidae. 
227 
variation so that the brown of each side may be reduced to a 
row of rounded spots. Venter of the abdomen reddish brown 
at the base and infuscated toward the apex. 
Male. Eyes distinctly pilose, no evident separation into 
different sized facets. Easily associated with the other sex. 
Several specimens from Orono, Maine, collected in July, 1899, 
bv the late Professor F. L. Harvey. Other specimens from 
Oswego, N. Y.; Springfield, Mass., collected by Dr. George 
Dimmock; and one from Canada. 
Tabanus albocirculus n. sp. Length 17 millimeters. Nearly 
black with fumose wings, narrow front and a black spot sur¬ 
rounded by white on the scutellum. Furcation of the third vein 
with a long appendage. 
Front narrow, with a raised line which reaches from the loca¬ 
tion of the frontal collosity at least two thirds of the distance to 
the vertex. Antenna elongate, first segment slightly enlarged^ 
third with a prominent angle at base above, annulate portion 
not much more than half as long as the basal; palpi light colored 
and clothed with black hairs. Thorax dark brown, nearly black, 
scutellum with a round black spot which is margined with white; 
wings uriformly fumose, furcation of the third vein with a long 
appendage, first posterior cell slightly narrowed at the apex;, 
legs dark brown, almost black, base of each front tibia white 
and the entire legs thinly clothed with white hair. Abdomen 
almost entirely black, but each segment with a gray posterior 
border which on each of the second, third, fourth and fifth is 
expanded into a gray triangle at the middle of the dorsum. 
Female from Tueurrique, Costa Rica, collected by Schild 
and Burgdorf. The species suggests Tabanus melanocerus, but 
the narrow front and conspicuous black spot on the scutellum 
at once distinguish it. 
Tabanus littoreus n. sp. Length 9 to 11 millimeters. About 
the size of Tabanus pumilus and something like that species in 
general appearance, front very wide, with a shining black frontal 
callosity which has no denuded line of spot above it. General 
color chocolate brown, or a little lighter, the ground color of the 
thorax being partially obscured by a sparce coating of gray hairs. 
Female. Front wide, in the largest specimens nearly a milli¬ 
meter, scarcely narrowed before, frontal callosity as wide as the 
front, nearly square, shining black, with no denuded line or spot 
above; antenna light brown, annulate protion of third segment 
darker, first segment short and slender, third with no well de¬ 
fined angle above but widest near the base and gradually nar¬ 
rowed, with no evident curve toward the apex; palpi pale, thick 
at base, pointed at the apex and all but as long as the proboscis. 
Thorax brown, sparsely clothed with gray hairs; wings hyaline, 
stigma distinct, brown, first posterior cell wide open, furcation 
