ART. 15». REVISION OF SUBFAMILY PLATYGASTERINAE FOUTS. 99 



as the thorax, twice as long as wide, rounded posteriorly; wings 

 hyaline, extending the length of the last four segments past the apex 

 of the abdomen. Color lighter than in the female, the legs often 

 bright yellow; antennae brownish. 



Type locality. — Milwaukee, Wisconsin. 



Type.— Cat. No. 2274, U.S.N.M. Type male and allotype female 

 selected. 



Host. — Cecidomyia antennaria Wheeler. 



Redescribed from the types, fifteen females, and ten males. It 

 seems likely that the specimens were killed too soon after emerging 

 to attain their normal color. The shrinkage of the male antenna 

 lends support to this veiw. The sculpture on the second tergite is 

 subject to variation, the striae being more numerous and stronger in 

 some individuals than in others. 



64. PLATYGASTER PFNI, new species. 



Female. — Length 1.5 mm. Shape of the body somewhat as in 

 antennariae but the thorax not so flattened, higher than wide seen 

 from the side. Head twice as wide as long, slightly emarginate 

 behind, the cheeks suboonvex viewed from above; occiput trans- 

 versely striate, more coarsely so than in antennariae; cheeks finely 

 shagreened; interrooellar area and space around lateral ocelli indis- 

 tinctly shagreened ; frons mostly polished, unsculptured, below and on 

 the sides finely shagreened; flagellum as long as the thorax; antennal 

 joints two to five, inclusive, equally wide; joint six a little wider; seven 

 to ten subequal in Avidth, slightly wider than six ; pedicel two and one- 

 half times as long as wide, about as long as joints three and four 

 united; three half as long as two; four and five equally long; six 

 a little longer; seven to nine slightly longer than six; ten as long 

 as the pedicel, acute apically, the sides rounded; thorax nearly twice 

 as long as wide, strongly convex above, distinctly narrower than the 

 head; pronotum finely longitudinally aciculate below, polished behind; 

 mesonotum polished; notauli widely separated and extending to the 

 anterior third of the mesonotum the median lobe broadly rounded; 

 scutellum transverse, very highly elevated, narrowly margined later- 

 ally, polished and without pubescence above; abdomen elliptical, of 

 a similar form to that found in antennariae, twice as long as wide, as 

 wide as the thorax; median area on first tergite about as wide as long, 

 longitudinally carinate; second tergite as long as wide; basal foveae 

 feebly striate, the striae reaching about the middle of the segment ; 

 tergites three to five equally long, unsculptured, with a row of hairs 

 across each; six longer, broadly rounded apically, with a row of hairs 

 around its edge; last four tergites united as long as the second; wings 

 hyaline, extending the length of the last segment past the apex of 

 the abdomen. Shining-black; antennae and legs piceous, the tarsi 

 (except the last joint of each) paler.. 



