MONOGKAPH OF THE NORTH AMERICAN PROCTOTRYPID.E. 121 



Thorax oblong, compressed at sides, siibc^oiivex above, the collar not 

 apparent, the mesouotum with a delicate impressed median line, scu- 

 tellum small, metathorax very short. 



Wings wanting. 



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

 and much wider, beneath strongly convex, above subconvex, the sec- 

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

 face. 



Legs pilose, the last joint of jiosterior tarsi twice 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 Me(/a- 

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

 between the antennae 



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



Lagyuodes minutus, sp. iiov. 

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



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

 impunctured, sparsely pilose; the antennae basally and the legs pale 

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

 brown; the tiagellar 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 vsec- 

 ond segment at apex ti:ged with fuscous or brown. 



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



Types in Coll. Ashmead and !Natioual Museum. 



Described from many specimens taken by myself and Schwarz. 



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

 the European L. rufus Forster {=L. paWulm Boh.). 



ATRITOMUS Forster. 



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



(Type A. cocropJuigus Fiirst.) 



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

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

 triangularly arranged. 



Antennie inserted at the clypeus, 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 from above; mesouotum 

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

 scutellum large, longer than wide, the axilltE usually, but not always, 

 separated; metathorax very short, the angles rounded. 



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



