ART. 15». REVISION OF SUBFAMILY PLATYGASTERINAE FOUTS. 75 



unsculptured, united two-thirds as long as the second; six shghtly 

 wider than long, rounded posteriorly; wings hyaline, reaching to the 

 apex of the abdomen. Black; antennae piceous; pedicel brown; legs 

 dark brown; anterior tibiae apically, and all tarsi (except the last 

 joint of each), yellowish. 



Male. — Length 1.15 mm. Pedicel one and one-half times as long 

 as wide, as wide as joint three; three transverse, as wide as four; 

 four oblong, not enlarged apically, as long as two; following joints 

 a little longer than wide; abdomen ovate, slightly shorter than the 

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

 wide, rounded apically; tergites three to seven half as long as the 

 second; wings hyaline, extending the length of the last four segments 

 past the apex of the abdomen. 



Type locality. — ^Washington, District of Columbia. 



Type.—Q&t. No. 2297, U.S.N.M. Type female and allotype male 

 selected. 



Redescribed from the types, one female and two males, reared 

 April 23, 1884, from a Cecidomyid gall on Adinomeris squarrosa 

 Nuttall. One of the parat3'pes is off point and lost. 



The National Museum possesses several specimens of what I 

 take to be this species from Kirkwood, Missouri, reared from a 

 species of Lasioptera infesting honey locust. The Cecidomyid host 

 of these specimens and of the types of actinomerids are so different 

 that I hesitate to make any definite statement in regard to the 

 identity of the parasites. 



41. PLATYGASTER ARTIMESIAE (Ashmead). 



Polygnotus artimesiae Ashmead, Bull. 45, U. S. Nat. Mus., 1893, p. 309. 



Female. — Length L4 mm. Head twice as wide as long through 

 the middle, a little wider than the thorax across the tegulae, not 

 excavated behind; occiput and vertex rather finely striate, as in 

 asynaptae; ocellar triangle finely shagreened; frons finely diagonally 

 aciculate, more strongly so toward the malar space; pedicel twice as 

 long as wide, as long as joints three and four united; third joint 

 narrower than the second, two-thirds as long as the fourth; four a 

 little longer than wide, slightly wider than the pedicel; five spherical, 

 as wide as the pedicel; six as long as four, a little wider at apex 

 than four, narrowed basally; joints seven, eight, and nine subequal 

 in width and length, about as wide as long, a little wider than six; 

 last joint conical; thorax two-thirds as wide as- long; pronotum 

 fineh" shagreened; median area broadly transverse, polished, with a 

 few short, faint, transversely directed striae along the sides, wider 

 above than below, the sides curved above; mesonotum strongly con- 

 vex, rather strongly shagreened on anterior half, polished posteriorly; 

 notauli reaching to the middle of the sclerite, the median lobe 



