ART. 15». REVISION OF SUBFAMILY PLATYGASTERINAE FOUTS. 63 



about twice as long as wide, the last ovalo-conical; thorax short, 

 thick, about as wide as high, approximately two-thirds as wide as 

 long, moderately convex ; pronotum as in comjjressiventris , but the 

 median area wider above than below, not sculptured; notauli com- 

 plete, meeting in a rounded tip posteriorly; median lobe shagreened, 

 polished posteriorly, without the two anterior ridges; lateral lobes 

 mostly pohshed, with a narrow shagreened band inwardly; scutellum 

 transverse, strongly convex, margined laterally, polished, the anterior 

 angles finely shagreened ; abdomen about as long as the head and 

 thorax united, as wide as the thorax, broadly elliptical, about twice 

 as long as wide, flattened above, convex below; first tergite about 

 twice as wide as long, slightly elevated anteriorly, rounded above, 

 the median area narrow and not well defined; second tergite about 

 a fourth longer than wide, a little over half as wide anteriorly as 

 posteriorly, the foveae distinct, deep, without pubescence at base, 

 the striae numerous, moderately fine, and extending slightly beyond 

 the apices of the foveae; tergites three and four about equal in length, 

 the former wider, the sides of both oblique ; fifth half as long as the 

 fourth, narrower; sixth triangular, pointed apically, as long as the 

 third; wings subhyaline, extending slightly beyond the apex of the 

 abdomen. Black; antennae and legs shining brown, the tibiae and 

 tarsi a little lighter. 



Male. — Length 1.5 mm. Abdomen distinctly longer and narrower 

 than the thorax, subconvex above, more highly convex below, 

 obvate, broadly rounded posteriorly, a little over twice as long as 

 wide; last tergite perpendicular; wings extending about half the 

 length of the abdomen past its apex. 



Type locality. — District of Columbia. 



Type.— C&t. No. 24605, U.S.N.M. Type female and allotype male 

 selected. 



Redescribed from the type series, three females and one male. 

 The females are in good condition. The male, however, has the head 

 and most of the legs missing. Ashmead merely mentioned the male 

 in his description so I am unable to give any further particulars in 

 regard to its missing parts. The distinguishing features of this 

 species are the short thorax in both sexes and the long antennae in 

 the female. 



29. PLATYGASTER COLORADENSIS (Ashmead). 



Poly gnotv^ coloradensis AsnuEAu, Bull. 45, U. S. Nat. Mus., 1893, p. 320. 



Female. — Length 1.2 mm. Head shaped as in filicornis; occiput, 

 vertex (more finely medially), and cheeks behind, shagreened; frons 

 finely aciculate above on the sides, finely diagonally striate to the 

 sides of the antennal sockets, otherwise polished; interocellar area 

 very finely shagreened ; thorax shaped as in filicornis, more finely 



