PROC. ENT. SOC. WASH., VOL. 22, NO. 4, APRIL, IQ2O 63 



broadly transverse, subtriangular; ninth as wide as the eighth, half as long 

 as the first club joint ; club 3-jointed, first as long as the pedicel but distinctly 

 wider, nearly circular in outline; second oblong, longer than wide, as wide as 

 the scape, as long and as wide as the last; last club joint ovate, bluntly pointed; 

 thorax oblong, truncate anteriorly, narrower than the head, slightly shorter 

 than the abdomen; pronotum rather prominent, bluntly angled laterally, 

 without pubescence; mesonotum wider than long, rounded anteriorly, trun- 

 cate posteriorly, polished and impunctate; notauli absent; scutellum circu- 

 lar, with a broad, shallow fovea at its base; pleura smooth, impunctate; pro- 

 podeum short, a little longer than the scutellum, covered with silvery hairs 

 only laterally, produced above into two broad, tongue-like plates which 

 extend entirely over the first tergite, the space between them twice as long 

 as wide, truncate anteriorly ; wings hyaline, subcostal nervure extending only 

 one-sixth of the length of the wings from the base ; abdomen oblong, abruptly 

 narrowed anteriorly and posteriorly; not quite twice as long as wide, feebly 

 convex above; first tergite scarcely visible under the propodeal lamellae, 

 transverse, covered with long silvery hairs; second tergite very large, as long 

 or nearly as the entire thorax, smooth and impunctate, with a few short white 

 hairs scattered over it and with a row of white hairs across it subapically; 

 third, fourth, and fifth tergites subequal, much wider than long; last tergites 

 triangular, bluntly pointed, as long as the fifth ; ovipositor exserted, the sheath 

 stout. Brown; head and abdomen fuscous, the legs yellowish. 



Male. -Length 1 mm. Differs from the female principally in sexual char- 

 acters. Antennae extending to the base of the abdomen, filiform and cov- 

 ered with short hairs; pedicel a little longer than wide, oblong; third antennal 

 joint slightly wider than pedicel, as wide as the scape, conical; fourth as long 

 as the third and the pedicel together, as thick as the scape, deeply emarginate 

 below; fifth quadrate, as long as, but slightly wider than the sixth; joints 

 7-14 moniliform, slightly transverse; last joint a little longer than the pre- 

 ceding, obconical; tongue-shaped processes of propodeum shorter than in the 

 female, reaching only to the middle of the first segment of the abdomen; 

 abdomen as long as the thorax, truncate apically; head and thorax darker 

 than in the female. 



Type locality. Hagerstown, Maryland. 



Type. Cat. No. 22795, U. S. N. M. 



Described from four specimens, three females and one male, 

 reared by Mr. H. L. Parker, July 31, 1915, from a dipterous pupa, 

 and recorded in the Bureau of Entomology under Accession No. 

 12003. One paratype retained by the author. 



The allotype presents a rather curious aberration in that the 

 antennae differ from one another. In the normal antenna, joints 

 seven and eight are separated as usual, but in the other, joints 

 seven and eight are united and only partially divided by a lateral 

 incision. It should also be mentioned that this is the first species 



