ART. 15". REVISION OF SUBFAMILY PLATYGASTERINAE FOUTS. 65 



second tergite about as long as wide; basal foveae as in coloradensis, 

 with or without faint striae on their inner slopes, with a few hairs 

 basalh' ; area between foveae with or without a few fine striae ; abdo- 

 men about two and one-half times as long as wide, a little longer 

 than the head and thorax united; segments three to six inclusive 

 about of e([ual length, narrowing to the sixth, the sides of all straight 

 and continuous; last tergite about as long as wide, pointed apically, 

 with a row of short white hairs laterally; each of the tergites three 

 to five traversed by a row of short white hairs; wings subhyaline 

 sometimes brownish, extending slightly beyond the apex of the abdo- 

 men. Black; appendages colored as in coloradensis Ashmead. 



Male. — Length 1.3 mm. Pedicel about twice as long as wide, twice 

 as long and considerably wider than the third joint seen from the 

 side; joint three a little longer than wide, closely joined to and about 

 half as wide as the fourth; fourth joint a little shorter than the 

 second, much wider, twice as wide apically as basally, slightly em- 

 arginate: joints five to nine, inclusive, equal in length and width, 

 about one and one-third times as long as wide, a little wider than the 

 pedicel; last joint as long as the third and fourth united, shaped as 

 in coloradensis; abdomen shaped as in coloradensis but wider, dis- 

 tinctly wider than the thorax; wings infuscated, extending the length 

 of the last six segments past the apex of the abdomen. 



Type locality. — San Francisco and Alameda, California. 



Type.— Cat. No. 2302, U.S.N.M. Type female and allotype male 

 selected. 



Redescribed from the type series, five females and eight males. 

 These specimens were reared by A. Koebele, January 10 and 23, 1883, 

 and July 16 and December 17 and 19, 1885, from a Cecidomyid gall 

 found on Baccharis pilularis. 



31. PLATYGASTER SOUDAGINIS (Ashmead). 



Pohjgnotus solidagimsAsB.UEAnCaji.I!,nt.,\ol.l9, 1887, p. 131. — Oresson, Syn. 



of Hyra., 1887, p. 250.— Ashmead, Bull. 45, U. S. Nat. Mus., 1893," p. 



307. 

 Polygnotus angulatus Ashmead, Bull. 45, U. S. Nat. Mus., 1893, p. 319. — 



Brues, Bull. 22, Conn. Geol. Nat. Hist. Surv., 1916 (1917), p. 540. 



Female. — Length 1.40 mm. Head twice as wide as long, not 

 emarginate behind, flattened in front, more or less oblong seen from 

 above, distinctly wider than the thorax; occiput and vertex striate 

 as in striaticeps but usually more finely so; cheeks convex, nearly as 

 wide as the eyes, aciculate-shagreened ; projection of vertex broadly 

 rounded, rather sharp, not extending far over the margin of the eye, 

 its edge raised and the upper surface roughened; interocellar area 

 finely shagreened; frons aciculate on the sides and below, with several 



