MONOGRAPH OF THE NORTH AMERICAN PROCTOTRYPID^. 139 



circular ; post-scutellum armed with a short, stout spiue or tooth ; meta- 

 thorax short. 



Front wings fringed, with a marginal vein about half t lie length of the 

 stignial, the latter oblique, ending in a small knob. 



Abdomen oval, depressed, somewhat broader than the thorax ; the 

 first segment short, striate, the second very large, the following short. 



Legs rather long, slender, the femora subclavate, tarsi 5-jointed, the 

 basal joint of hind tarsi more than three times as long as the second. 



Distinguished by the spined scutellum. 



Trimorus americanus, sp. iiov 

 (PI. VII, Fij;. 4, ^.) 



S . Length, 1.2""". Polished black, impnnctured, sparsely pubes- 

 cent. Head transverse, not wider than the thorax; lateral ocelli on 

 the margin of the eye; eyes oval, pubescent. Antenu.e 12-jointed, tili- 

 form-moniliform, extending to the middle of the abdomen; the scape 

 scarcely reaches to the middle ocellus, brownish-yellow; the flagellum 

 rust-brown, the pedicel very small, the first and third funicle joints 

 equal, twice as long as the pedicel, the second slightly smaller than 

 the first, the fourth and the following to the last about equal, monili- 

 form, the last oval. 



Thorax ovoid, the mesonotum with 2 furrows abbreviated anteriorly; 

 scutellum semicircular; the post-scutellum produced into a small tri- 

 angular tooth ; metathorax very short. Abdomen oval, black, not longer 

 than the thorax, the first segment striated. Wings hyaline, pubescent, 

 the venation brown; the marginal vein is rather thick, the length of 

 the shaft of the stigmal, the latter terminating in a small knob. 



Habitat. — Arlington, Va. 



Described from a single specimen. 



PHANT7RnS Thouisou. 



Ofv., 1860, p. 169. 

 {P. angiisfatus Thoiii.) 



Head quadrate or subquadrate, the frons smooth, shining, the occiput 

 usually but slightly emarginate, not margined. Ocelli 3, triangularly 

 arranged, the lateral touching the margin of the eyes. Eyes large, 

 oval, sometimes slightly pubescent. 



Antennje in 9 11-jointed, subclavate, rarely distinctly clavate, from 

 the last two funicle joints being widened ; in S 12-jointed, snbmonili- 

 form, shorter than the body; the pedicel longer than the first funicle 

 joint, the second funicle joint about twice as long as the first, the third 

 shorter, joints beyond raoniliform or submoniliform, the last ovate. 



Maxillary palpi 2-jointed. 



Mandibles bifid. 



Thorax ovate or long ovate, the mesonotum longer than wide, with- 

 out furrows, the metathorax not especially shortened. 



