MONOGRAPH OF THE NORTH AMERICAN PROCTOTRYPIDiE. 225 



vate, the club 5 or G jointed, snbsolid, iu $ filiform, siibinouiliform, the 

 second flagellar joint shorter than the first or third. 



Mandibles bifid at tips. 



Thorax ov^oid, the prothorax rounded before, not, or scarcely, visible 

 from above, except the lateral angles; mesonotum broader than long, 

 with two distinct furrows; scutellum semicircular, subconvex, with a 

 punctate frenum behind; metathcn-ax short, carinated at apex. 



Front wings with the submarginal vein reaching the costa a little 

 beyond the middle of the wing, the marginal vein usually a little thick- 

 ened, although linear and scarcely as long as the short stigmal, the lat- 

 ter knobbed at tip, the postmarginal vein very long; basal nervure 

 wanting or subobsolete. 



Abdomen oval or oblong oval, the first three segments nearly equal, 

 the third, usually a little the longest. 



Legs with all femora and the anterior tibiae clavate, tibial spurs 1, 1, 1, 

 the basal joint of hind tarsi thrice, or a little more than thrice, as long 

 as the second. 



The distinct parapsidal furrows, transverse head, short or puncti- 

 form marginal vein, and absence of the horn at base of abdomen dis- 

 tinguish the genus. 



Two species iu our fauna can be thus tabulated: 



Thorax and abdomen, except sometimes tlio tip, brownish-yellow 2 



Mostly black, the collar, jdeura, and base of abdomen pale. 



Scutellum smooth, highly jiolished A. virginiensis. 



2. Head black or fuscous. 



Scape, mandibles, and legs yellowish A. nigriceps. 



Anteris virginiensis, sp. nov. 



$. Length, 1.20'""\ Black, shining; head transverse; mesonotum 

 very faintly punctate, in marked contrast to the highly polished scu- 

 tellum; collar, pleura, and base of abdomen rufous or yellowish; man- 

 dibles rufous. Antennie 12-joiuted, filiform ; scape as long as the first 

 three flagellar joints united; pedicel small, round; first funiclar joint 

 the longest, about twice as long as the second; the following joints 

 about equal, longer than the second, but not quite as long as the first. 

 Mesonotum with two distinct furrows. Scutellum semicircular, smooth , 

 polished. Metathorax very short, polished, its posterior margin cari- 

 nated. Legs, including coxie, honey-yellow. Wings hyaline, iridescent, 

 the marginal vein thick, as long as the stigmal, the latter oblique, end- 

 ing in a knob, the postmarginal about three times as long as the mar- 

 ginal, the basal vein subobsolete. Abdomen long-oval, as long as the 

 head and thorax together, smooth, polished, the first segment and the 

 second, at base, striated ; the first segment is yellowish, the third the 

 largest, about one-third longer than the second, or a little more than 

 twice as long as the fourth. 

 21899— No. 45 15 



