F. R. COLE 45 



The type was from Philadelphia, Pennsylvania (Osten Sacken). 

 I have not seen this species. 

 Opsebius sulphuripes (PI. VII, fig. 24.) 

 Opsebius sulphuripes Loew, Centuries, ix, p. 204. 



" Blackish, shining, halteres and legs whitish or pale yellowish, wings blackish 

 fuscous, first posterior cell divided Ijy a cross-vein, anal cell open. Length, 

 2^ lines. Wing, 2 ''/n Hues. 



"Black, shining. Eyes closely black pilose, however pile on lower part of 

 eyes paler than on upper part. Antennae yellowish. Prothoracic stigmata 

 liordered brown. Dorsum of thorax, scutellum and abdomen whitish pilose. 

 Legs whitish or pale yellowish, finely white pilose Tegulae moderate, hyaline. 

 Halteres pale yellow. Wings brownish, the tips and posterior margins paler; 

 veins browni.sh black; small cross-vein perpendicular; first posterior cell cut by 

 the other cross-vein, as in 0. gagatinus, between end of discal cell and base of 

 second submarginal; the third posterior cell, which in 0. gagaiinus goes beyond 

 the base of the fourth, in this species does not reach it, thus the third posterior 

 cell is shorter than the fourth; anal cell, in gagatinus and inflatus long and closed 

 in the margin, is open in sulphuripes." 



Habitat — ^Sharon Springs, New York (Osten Sacken). 



Prof. A. L. Melander in his notes on the Acroceridae (1902) 

 mentions a specimen of this species taken at Alameda County, 

 California, which answered the type description well. The 

 species is rare and I have seen only two specimens. 

 Opsebius pterodontinus (PI. VIII, fig. 26.) 

 Opsebius pterodontinus O. S., Berlin Ent. Zeit., xvii, p. 299, (188.3). 

 Opsebius agalenae Melander, Ent. News, xiii, p. 180, (1902). 



"Male. Brownish black, shining, clothed with dense, erect, fulvous hairs; 

 legs yellow; wings hyaline; costawith a conspicuous abrupt projection at the 

 end of the first vein. Length, 7 mm. 



"The dense hair on the eyes is brownish-fulvous; the antennae brown, arista 

 brownish-yellow; thorax and abdomen are clothed with a uniform covering of 

 erect fulvous hairs, through which the shining, apparently dark brown, ground 

 color is visible. Halteres whitish yellow; tegulae transparent, with a yellowish 

 tinge; veins yellow, anal cell open; third posterior cell much shorter than the 

 fourth, all the veins reach the margin; first posterior cell divided by a cross-vein 

 which is a little beyond the discal cell; posterior cross-vein nearly opposite (a 

 trifle beyond) the origin of the second vein; tip of the second vein opposite the 

 proximal end of the second submarginal cell, the costa, soon beyond the ending 

 of the auxiliary vein is thickened, and the thickening forms an abrupt jirojec- 

 tion, blunt at the tip; the terminal portion of the first vein, likewise cons])icu- 

 ously thickened, runs parallel to the costa, with a very small space between, 

 and coalesces with it under the projection. 



TRANS. AM. ENT. SOC, XLV. 



