NO. 2197. NEW PARASITIC HYMENOPTERA—OAHAN. 217 



Superfamily PROCTOTRYPOIDEA. 

 Family PLATYGASTERIDAE. 



POLYMECUS LASIOPTERAE, new species. 



Female. — Length 1.1 mm. Head polished, impunctate; antenna! 

 scape somewhat swollen, pedicel nearly twice as long as thick, about 

 equal in length to the two first funicle joints combined; first funicle 

 joint smaller than the second; the second, third, and fourth funicle 

 joints subequal; club not strongly differentiated from the funicle, 

 4- jointed, the joints, except the last, subequal and very slightly 

 longer than broad, the apical joint conic-ovate and about one and 

 one-half times as long as thick; mesoscutum and mesopleura pol- 

 ished impunctate, the parapsidal grooves absent; mesoscutellum 

 polished, convex, without an apical spine ; metapleura longitudinally 

 aciculate-striate ; propodeum short, apparently with a carina each 

 side of the median line; abdomen strongly compressed dorso-ven- 

 trally, nearly twice as long as the head and thorax, broadest at apex 

 of the second segment, beyond gradually and evenly tapering to a 

 point at apex ; first tergite longitudinally striate, the tergites beyond 

 the first perfectly smooth and polished; second tergite the longest, 

 about twice the length of the third; tergites beyond the second sub- 

 equal in length. Whole insect black except base of scape, the tro- 

 chanters, all tibiae at base, and all tarsi which are more or less tes- 

 taceous; wings hyaline. 



Male. — Agrees with the female, except that the second funicle joint 

 is more swollen, being much broader and twice as long as the third 

 joint, the first funicle joint is very small, and the abdomen is barely 

 longer than the head and thorax combined, spatulate in outline as 

 seen from above, the apex rounded. 



Type-locality. — Elk Point, South Dakota, 



Type.— Csit. 20397, U.S.N.M. 



Six females and one male reared by C. N. Ainslie from Lasiopfera, 

 species infesting Muhlenbergia and recorded in the Bureau of Ento- 

 mology under Webster No. 11838. 



