AMERICAN HYMENOPTERA. 215 



nx to summit, and the back of head black ; remainder pale; a slender 

 ridge runs through the groove on anterior lobe of thorax ; the teguloe, 

 anterior angle, pleura and whole body beneath whitish, except two 

 black spots on pleura, the anterior one large and lunulate; seutel black, 

 sutures of abdomen indistinctly pale; legs pale, with the apical half of 

 hinder femora and tibifB and their tarsi blackish; inner tooth of claws 

 large and near the tip ; wings hyaline, stigma full, nervures and stig- 

 ma piceous, base of stigma and costa pale. 



S . Antennae fulvous beneath, third joint shorter than fourth, curv- 

 ed at base; a straight black line under the anterior wings, tips of pos- 

 terior tibife blackish, their femora pale, stigma color of costa. 



la., (^Say,) Conn., New York, Penn. Great Slave Lake, Hudson's 



Bay Territory. 



;J8. Nematus trilineatus, n. sp. 



Testacedus ; spot on vertex, three vittce on thorax, spot on pleura, bands on 

 tergum, hinder tibiae and tarsi black. Length 0.26. Br. wings 0.50 inch. 



$ . Resembles N. lonfftdicm-nix. Body long and not very stout. 

 Antenna) long and slender; head testaceous, with a black spot about 

 ocelli and the enclosed square behind it ; back of head pale. Body tes- 

 taceous; seutel pale, its hinder third black; three vitt;B ou mesotho- 

 rax ; part of metathorax, basal plates, a band covering most of each 

 segment of tergum, and a small spot on pleura below the anterior 

 wings black; a large, clear waxen spot covering pleura; breast testa- 

 ceous ; venter almost white; coxa3, trochanters and base of femora 

 white, the tarsi of four anterior legs above, the hinder tibia and tarsi 

 wholly black; remainder of legs testaceous ; inner claw tooth large and 

 near the tip. Wings hyaline, stigma testaceous, costa and nervures 

 blackish. 



Canada, (Coll. Am. Ent. Soc.) Newburgh, N. Y., (W. H. Edwards). 

 Three 9 . 



39. N. vertebratus. 



JVematus vei-tebratus, Say, Bost. Jour, i, \i?>b, 218, 9 • 

 Norton, Bost. Proc. viii, 158, 1. 

 "Green; antennee and sj^ots above blackish. Length one-quarter of an inch. 

 9 • Body pale green ; vertex with a black spot ; antennfe black, 

 fuscous toward the tip; second and third joints subequal; nasus white, 

 somewhat bilobate ; labrum not very obtusely rounded before, a little 

 indented on the disk, white; mandibles piceous at the tip; thorax tri- 

 lineate with black, seutel black; wings hyaline, nervures blackish, cos- 

 tal nervure and caipus pale greenish ; tergum with a vitta of blackish 

 spots, almost obsolete toward the tip, tarsi dusky." 

 Indiana. 



