190 The Ohio Journal of Science [Vol. XX, No. 6, 



Tabanus trivittatus Fabricius. 



Length 12 millimeters. A dark colored rather slender species. 

 Thorax without stripes but with more or less greenish irridescent 

 vestiture. Abdomen dorsally with a little reddish on the sides of the 

 first two segments and with three narrow pale longitudinal stripes, one 

 on the middorsum and one on either side of it. Ventrally abdomen quite 

 broadly red basally. Front narrow, narrower below than at the vertex, 

 frontal callosity nearly as wide as the front and nearly twice as high as 

 wide and without or with only an obscure line above it; subcallus 

 denuded and shining dark brown. Antenna yellow, first segment darker 

 slightly enlarged and produced anteriorly above, third segment with a 

 small tooth near the base above, annulate portion short, only about 

 half as long as the basal portion. Palpi robust nearly as long as the 

 proboscis which is shorter than usual. Wings uniform fuliginous all 

 over, first posterior cell wide open, no stump on the anterior branch of 

 the third vein. Femora and tarsi all black, front tibia white on basal 

 three-fifths, black beyond; middle and hind tibia pale, black only at 

 the extreme apex of each. 



_I have more than a score of specimens of this species from 

 Bartica, British Guiana, and from other adjacent localities, 

 many of them collected by H. S. Parish. The species answers 

 the description of trivittatus almost in detail. 



Tabanus curtus n. sp. 



Total length 9 millimeters. Front gray, of medium width, very 

 slightly narrowed below, frontal callosity shining dark brown, nearly 

 square, a disconnected fine line above continued for a short distance 

 only. Antenna yellow, first segment somewhat enlarged, gray pollinose, 

 black haired above; third segment rather wide with a basal angle above, 

 annulate portion shorter than the basal portion; palpi white, robust, 

 with scattering black hairs. Thorax dark dorsally without stripes, 

 clothed with gray vestiture especially laterally and ventrally. Femora 

 black basally, more or less reddish apically, front tibia white on basal 

 three-fifths, otherwise black, middle and hind tibiae red, tarsi all dark, 

 front ones black. Wings hyaline, first posterior cell wide open, no 

 stump on the anterior branch of the third vein. Abdomen with a 

 prominent middorsal gray stripe and one on either side of it of the same 

 color and of equal width, intervals dark brown, venter fuscous with 

 reddish showing through in places and with red hind margins to the 

 segments. 



Holotype female from Pedernales, Venezuela, January 25, 

 1911, collected by S. Brown. In the collection of the Philadel- 

 phia Academy of Natural Sciences. Paratype in my collection. 



Tabanus tantulus n. sp. 



Total length 10 millimeters. Thorax dark with four gray stripes, the 

 lateral ones just above the attachment of the wings, the median ones 

 located one on either side of the middorsal line, pleiura and below white 



