ART. 15«. REVISION OF SUBFAMILY PLATYGASTERINAE FOUTS. 53 



with short ])iihescence. Black; antennae and last joint of each tar- 

 sus uniformly dark brown; legs reddish brown, the front tibiae, mid- 

 dle and hind tibiae at base, and tarsi, tinged with yellow. 



Male. — Length 1.70 mm. Pedicel twice as long as wide, narrowed 

 proximally ; third joint one-third as long as the second and much nar- 

 rower, closely jointed to the fourth; fourth a little shorter than, but 

 conspicusly thicker than the second, not as thick as in pallipes, 

 indistinctly emarginate proximally; joints four to nine, inclusive, seen 

 laterally slightly but distinctly longer than wide ; ten conical, pointed, 

 distinctly longer than the second; abdomen slightly shorter than 

 the head and thorax united, about as wide as the thorax, twice as 

 long as w^ide, broadly rounded apically, not much narrowed basally; 

 front legs a little lighter than in the female, yellowish, the femora 

 medially brownish ; antennae dark brown. 



Type locality. — District of Columbia. 



Type.— Cat. No. 24602, U.S.N.M. 



Redescribed from the types in the United States National Museum. 

 They were reared April 30 and May 1, 1884, from a Cecidomyid gall, 

 Cecixlomyia serrulata Osten vSacken found on alder. This species with 

 its moderately short abdomen in the female is intermediate between 

 such forms as Vancouver ensis Ashmead and herriclcii Paskard. 



21. PLATYGASTER SHASTENSIS, new species. 



Female. — Length 2.50 mm. Body flattened, rather broad seen 

 from above; head viewed dorsally a little over twice as wide as long, 

 emarginate behind, the cheeks rather full; frons feebly convex; occiput, 

 cheeks (except near the eyes), and vertex (with the exception of a 

 feebly striate area just behind the ocelli), strongly shagreened, much 

 as in vaTicouverensis; upper part of frons more finely shagreened, 

 traversed longitudinally by a median unsculptured furrow; face below- 

 middle of eyes finely transversely striate, the striae rather distant 

 from one another; antennae long and slender; scape long, slightly 

 curved basally, shagreened dorsally, not quite as long as the next 

 four joints united; pedicel thrice as long as wide, not much narrowed 

 basally; fourth joint equal in width to the third, one and one-half 

 times as long as the third, narrower than the second, about four times 

 as long as wide, the sides parallel; joints five to nine, inclusive, equally 

 long, five narrower, a little wider than the fourth; joints six to nine 

 about three times as long as wide, equally wide; joint ten three times 

 as long as wide, acutely pointed, widest proximally, the sides oblique; 

 thorax more or less flattened above, a little wider than high; anterior 

 face of pronotum perpendicular, hardly visible above, distinctly sha- 

 greened along the upper edge; pronotum polished laterally, unsculp- 

 tured; mesopleurae unsculptured, with the median furrow rather deep; 

 uotauli complete, meeting in a rounded point which touches the 



