MONO(JRAPII OF THK NORTH AMKRff'AN IMfOcTOTUYPIDE. 1^5 



Tlunax with (\v<» impressed lines subobsolct*- posU'iioily; sciitclliiinroii- 

 vex, separated from the mesonotnm by a transverse line; metaseiitel 

 hini armed with a small iuxitv tooth. VVinjjs hyaline, <iliat«'d. Lejxs 

 pale brownish-yellow, the coxa* iliisky basally. Abdomen lonjjer than 

 the head and thorax together, narrowed basally into a petiole and in- 

 serted far up on the metathorax behin<l the pt>stsentellnm, black and 

 polisheil. 



Habitat. — Ailington, Va. 



Type in ('oil. Ashmead. 



Deseribed from a single speeimen. 



The insect des«Tibed by me, in the beginning of my studies on this 

 family, under the name X. nihirola. is a 3 I'teromalid belonging to a 

 genus unknown to me. 



PROSACANTHA N.es. 



Mou., II, 11. 294 (18ai); Forster. Ilyiii. Stiul., ir, \k \0:\ (isr.6). 



( /'. loiifiiroriiiH Nt'cs. ) 



Head transverse, the occiput slightly emarginated and delicately 

 margined; ocelli .S, in a triangle, rather close together, the lateral 

 very distant from the margin of the eye; eyes oval, pubescent. 



Antenna; inserted on a clypeal prominence, 12-jointed, in 9 termina- 

 ting in a long, fusiform, (J-.jointed club; the funiclar Joints thicker than 

 the pedicel, the first two Joints longer than wide; in i long, filiform, 

 the joints long, cylindrical, the third angulated or emarginated from 

 near the middle towards the base. 



Ma^^iUary ]»ali)i .3 Jointed. 



Mandibles curved, bidentate at tips, the teeth in the left mandible 

 equal, in the right with the outer tooth the longer. 



Tiiorax ovoi<l, the prothorax scarcely visible from above, narrowed 

 into a slight neck anteriorly; mesonotnm broader than long, without 

 furrows, seldom occasionally with Indications of furrows posteriorly. 

 Scutellum large, semicircular, subconvex; metathorax armed with a 

 large sharj* spine or thorn ; nu'tathorax very short, the posterior angles 

 usually acute or spine<l. 



Front wings pubescent, ciliated, with a very long marginal vein that 

 ends at two-thinls the length of the wing and is <l or 7 tinu's longer 

 than the sh(U't stigmal vein, the postmarginal never developed. 



Abdomen long-oval, depressed, longer than the head and thorax 

 together, inserted high up on the metathorax, the first segment i)etio- 

 liform, nuich longer than wide, finted or striated, the third segment 

 always large and occupying more than half the rest of the abdomen, 

 either smooth or striated, the following segments very short. 



Legs long, slender, pubescent; the femora not especially thick; the 

 tibial spurs weak; the tarsi long, slender, cylindrical, claw\s simple. 



A genus most frecjuently confused with Telea^s^ but easily separated 

 by the much slenderer hind legs and the weaker tibial spurs. 



