MONOGKAPH OF THE NORTH AMEKICAN PKOCTOTRYPID^. 121 



Thorax oblong, compressed at sides, sub«!onvox above, the eolhirnot 

 apparent, the mesonotuni witli a delicate impressed median line, scu- 

 tellum small, metathorax very short. 



Wings wanting. 



Abdomen pointed ovate, subpetiolate, twice the length of the thorax 

 and much wider, beneath sti(mgly convex, above snbconvex, the sec 

 tmd segment very large, occupying about two-thirds of the whole sur- 

 face. 



Legs pilose, the last joint of ]»osterior tarsi twi<!e as long as the sec- 

 ond, claws small, simple. 



The small eyes, absence of ocelli, and the form of the thorax, suf- 

 ficiently separate this genus from all the others in the tribe M<'f/(t- 

 sjiiUni. The male is readily distinguished by having an acute spine 

 between the antenna!. 



Only a single species has been recognized in our fauna, as follows: 



Lagynodes miuutus, sii. nov. 

 (PI. VI, Fig. 10, 9.) 



9. Length, 1 to 1.5""". Honey-yellow to reddish yeHow, polished, 

 impunctured, sparsely lulose; the antenine basally and the legs ]>ale 

 or whitish. Antennte 11-jointed, thickened toward tips, the apical joints 

 brown; the flagellar joints, except the last, which is oblong, are not 

 longer than thick. The mesonotal line is only indicated posteriorly, or 

 entirely wanting. Abdomen with a few raised lines at base, the sec- 

 ond segment at apex ti ged with fuscous or brown. 



Habitat. — Washington, D, C, and Arlington, Va. 



Types in Coll. Ashmead and National Museum. 



Described from many specimens taken by myself and Schwarz. 



The species is much smaller, more slender, and paler colored than 

 the European i. rw/tts Forster (=X.pai/«Z«s Boh.). 



ATRrrOMXTS Forster. 



Kl. Mou., p. 56 (1878). 



(Type A. eoccophagus Forst.) 



Head transverse, stout, wider than the thorax, when viewed from in 

 front, wider than long; eyes large, rounded, prominent, bare; ocelli 3, 

 triangularly arranged. ■. v .»"^ - 



Antennse inscrtetl at the elypeus, 11-jointed, in $ serrate, in 9 fili- 

 form, the first three flagellar joints small. . ^ 



Maxillary palpi 4 jointed ; labial palpi 2-jointed. 



Mandibles bidentate. 



Thorax subovoid, the prothorax not visible irom above; mesonotum 

 with a single central impressed line or without impressed lines; the 

 scutellum large, h>nger than wide, the axilhe usually, but not always, 

 separated; metathorax very short, the angles rounded.- 



Front wings as in Lifgocerus, with a large semicircular stigma. 



