60 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.63. 



together into a compact mass which sometimes is quite globular, mostly, however, 

 each gall is quite distinct. They are of a soft, white spongy texture inside and con- 

 tain several cylindrical elongated cells. When fresh the color of the galls externally 

 is purplish and pale yellowish green. The larvae are white and dorsally and ventrally 

 beset with stiff bristles which enables them to move back and forward in their cell 

 quite easily. Some larvae are mounted on slide 3/1/105; the rest are placed in jar 

 to breed. Coll. Dec. 12, '82. Jan. 6, '83, one Proctotrypid issued to-day. Jan 20, 

 '83 two Proctotrypids issued to-day. 



18. PLATYGASTER WEBSTERI, new species. 



Female. — Length 2 mm. Head twice as wide as long, oblong, exca- 

 vated behind, slightly wider than the thorax, full behind the eyes, 

 entirely shagreened and shining (except immediately above the an- 

 tennae where it is strongly transversely striate) ; cheeks strongly 

 convex, as wide as the eyes; pedicel slightly over twice as long as 

 wide, as wide as joint five, a little wider than four, shorter than three 

 and four united; three longer than wide, half as long as two, nar- 

 rower than four; four three-fourths as long as two, as long as five; 

 joints six to nine a little longer than wide, wider than five; ten blunt 

 at apex, the sides parallel; thorax two-thirds as wide as long, sub- 

 convex above, a little higher than wide; pronotum finely shagreened 

 laterally; mesonotum strongly shagreened, the lateral lobes polished 

 outwardly; notauli complete, deeply marked; median lobe sharply 

 pointed apically; scutellum circular seen from above, convex, sha- 

 greened, sparsely pubescent; metapleurae, propodeum, hind coxae, 

 first tergite laterally and apically, first sternite, second basally, and 

 second tergite in the basal foveae, densely covered with white pubes- 

 cence; abdomen broadly elliptical, twice as long as \vide, a little 

 wider than the thorax, as long as the head and thorax united, pointed 

 apically; first tergite excavated on the sides, the median area longer 

 than wide, with an incomplete median carina; second a little longer 

 than wide, not much narrowed basally, the sides nearly straight; 

 basal foveae deep and v/ide, unsculptured, with long pubescence at 

 their bases; median area with raised border, unsculptured; tergites 

 three to six polished, united half as long as the second; three and 

 four equal in length, five longer; six as long as five, wider than long, 

 pointed apically; wings slightly tinged with brown, extending three- 

 fifths the length of the second tergite past the apex of the abdomen; 

 ovipositor sometimes slightly exserted. Shining black; antennae 

 piceous, hind coxae black; legs uniformly dark brown. 



Type locality. — Wooster, Ohio (?). . 



Type.— Cvit. No. 25434, U.S.N.M. Two paratj-pes in Collection 

 Fonts. Described from four females labeled, "On grass, Webster ,^ 

 May 19, 1*886." No locality is mentioned and I doubtfully suggest 

 the above. Professor Webster having been in Wooster working on 

 entomology about that time 



