Dec, 1907.] l^ew 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, 

 by the late Pi-ofessor 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 milhmeters. Nearl}^ 

 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 shghtly 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 upiformly fumose, fuixation 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 Tucurrique, 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 milhmeters. 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 hyahne, 

 stigma distinct, brown, first posterior .cell wide open, furcation 



