lOG PROCEEDINGS OF THE NATIONAL MUSEUM. vol.63. 



thorax, two and one-half times as long as wide; first tergite hairless, 

 sculptured as in roliweri; second tergite about as wide as long, more 

 than half as wide anteriorl}^ as posteriorly; basal foveae finely striate, 

 four or five of the striae extending to the apical third of the segment; 

 interfoveal area with numerous closely placed striae about as long as 

 the foveae; last four tergites united shorter than the second, each 

 traversed by a row of hairs; tergites three and four equal; five a 

 little longer; six as long as three and four united, as wide as long, 

 narrowly rounded apically; wings hyaline, reaching to the apex of 

 the abdomen. Black; antennae and legs of a uniform brown color, 

 the flagellum darker. 



Male. — Length 0.8 mm. Antennae of a similar construction to 

 that found in rohweri Fonts; third joint wider than long; fourth 

 joint curved above and widened apically, wider than the pedicel; 

 following joints about as wide as long; ten as long as the pedicel, 

 hardly longer than wide, pointed apically, the sides rounded; abdo- 

 men more or less elliptical but rather broader basally than in related 

 species (roAt/;m, ^wi, etc.), a little longer than the thorax, slightly 

 more than twice as long as wide; tergites three to seven united half 

 as long as the second; wings hyaline, extending the length of the last 

 five segments past the apex of the abdomen. Color as a whole some- 

 what lighter than in the female. 



Type locality. — Arlington, Vu-ginia. 



r^/^e.— Cat. No. 2298, U.S.N.M. Type male and allotype female 

 selected. 



Redesoribed from the types, three females and one male. Accord- 

 ing to Ashmead these specimens were reared June 15 and 17, 1886, 

 from a Trypetid gall on Vernonia noveboracensis. 



72. PLATYGASTER VARIABILIS, new species. 



Female. — Length 1.3 mm. Head twice as wide as long, scarcely 

 excavated behind, wider than the thorax, flattened in front; occiput 

 finely striate; cheeks faintly shagreened above; interocellar area sha- 

 greened; frons polished, finely aciculate below; pedicel twice as long 

 as wide, as wide as joint six, longer than any of the flagellar joints 

 except the tenth; joints three to five, inclusive, subequal in width, 

 narrower than the pedicel; three two-thirds as long as four; four 

 longer than five, as long as six; joints seven to nine subequal in 

 length and width, as wide as long, wider than six; ten twice as long 

 as wide, conical, acute apically, longer than three and four united; 

 thorax as wide as high, three-fourths as wide as long, convex above; 

 pronotum finely shagreened laterally; mesonotum evenly convex, 

 shining, shagreened anteriorly ; notauli extremely short, much shorter 

 than the scutellum, the median lobe narrow and truncated posteri- 

 orly; soutellum transverse, convex, broadly margined laterally, rather 



