312 E. T. CRESSON. 



I. quadriceps. — J. Elongate, narrow, suboylindrie ; honey-yellow: liead 

 large, quadrate, or somewhat subglobose, deeply emarginate behind, entirely 

 black, polished; antennae short, thickened at tip, the joints short, the basal 

 third fulvous, the rest black, with a broad yellow annulus about the middle; 

 thorax long, narrowed anteriorly, the region about the scutellum blackish: me- 

 tathorax long, feebly sculptured, with a long central area; wings short and nar- 

 row, hyaline, iiidesceiit, areolet broad, 5-angular, nearly quadrate, nervures 

 brown; legs short and stout, honey-yellow, the four posterior femora, except 

 base, and their tibise entirely black; abdomen subcylindric, thickened towards 

 the apex, first segment smooth above, gradually dilated to the tij); the fifth and 

 following segments black. Length .>i lines. 



%. Colored like the 9> but the antennae are much longer, filiform, fulvous, 

 dusky above and at tips beneath ; only the tips of the middle femora and tibiae 

 are black, and the abdomen has the sixth and following segments black. 



Mab. — Canada, Connecticut. One 9> one 'J,, specimens. This has much the 

 appearance of an Alomya. 



I. helvus. — 9- Ferruginous, very densely punctured, slightly pubescent; 

 head broad, transversely quadrate, eyes small, mandibles brownish; antennae 

 short, with short, thick-set joints, apical joints blackish; mesothorax, scutellum 

 and base of metathorax shining; scutellar region sometimes blackish ; tegulai 

 yellowish; wings shorter than usual, subhyaline, tinged with pale fuscous, ner- 

 vures and stigma brown, areolet broad, 6-angular ; legs rather slender, entirely 

 ferruginous; abdomen elongate, depressed, shining, slender at base, the first 

 segment not suddenly dilated at tip, the upper surface of which is very finely 

 aciculate. Length .3 — 'ih lines. 



Hab. — Connecticut, Pennsylvania, Illinois. Fourteen 9 specimens. 



I. helvolus. — 9- Elongate, narrow, ferruginous, somewhat shining, very deli- 

 cately sculptured; eyes smaller than usual; antennse moderate, dusky, with a 

 narrow whitish annulus about the middle, basal joints ferruginous, .short, not 

 so thick set as in helvua ; scutellum polished, the region on each side more or 

 less blackish; metathorax with the elevated lines indistinctly defined; tegulae 

 pale; wings shorter than usual, subhyaline, nervures pale, areolet broad, 5-an- 

 gular; legs stout, tir)s of posterior femora and of their tibiae dusky, posterior 

 coxae with a short, blunt tubercle beneath near the tip ; abdomen elongate, sub- 

 cylindric, subconvex, first segment eon vex at tip, smooth and shining; the two 

 or three apical segnaents blackish. Length 3 — 3^ lines. 



Hab. — Conneciicut, Pennsylvania, Illinois. Four 9 specimens. Closely al- 

 lied to vincibilis, but has the joints of the antennae shorter, the legs stouter and 

 the posterior coxae armed beneath; the abdomen is differently formed. 



I. vincibilis. — 9- Small, ferruginous, head large subt^uadrate; antennae rather 

 long, filiform, dull ferruginous, the incisures of the joints dusky, a narrow yel- 

 lowish annulus a little beyond the middle, joints three and four long, subequal, 

 five — seven a little shorter; metathorax with an elongate central area; teguhe 

 whitish; wings shorter than usual, subhyaline, iridescent, nervures pale, areo- 

 let 5-angular; legs slender, entirely pale ferruginous, tips of tarsi dusky; abdo- 

 men elongate, slender at base, broadest a little before the apex; first segment 

 minutely aciculate at tip; three apical segments black, shining, sometimes the 

 fourth segment is more or less blackish. Length 3 lines. 



Hub. — Illinois, (Dr. Lewis.) Two 9 specimens. 



