AKT. 15". KEVISIOX OF SUBFAMILY PLATYGASTERINAE FOUTS. 45 



more finely so posteriorly, pointed at apex; lateral lobes shagreened 

 except laterally on posterior two-thirds; scutellum subconvex, sha- 

 greened, indistinctly transverse, margined laterally; metapleurae, 

 propodeum, first sternite, first tergite in apical angles, and second 

 tergite in basal foveae, densely covered with white hairs; abdomen 

 shaped much as in vancouverensis Ashmead, distinctly less than twice 

 as long as the head and thorax united; median area on first tergite 

 longer than wide, with a delicate median carina basally; second ter- 

 gite one and one-half times as long as wide at apex, nearly twice as 

 wide apically as basally; basal foveae deep, smooth except on interior 

 edges where there are a few striae, these not extending posteriorly 

 beyond their apices; third tergite twice as wide at apex as long, wider 

 basally, the sides oblique, straight; fourth as wide at base as long, 

 narrower apically, the sides not quite so oblique as those of the third; 

 fifth twice as long and half as wide as the third, twice as long as wide, 

 the sides parallel ; sixth two-thirds as long as the fifth, sharply pointed 

 apically, slightly less than twice as long as wide, shining and unsculp- 

 tured; abdomen (with exceptions noted above) polished; wings 

 extending to apical third of fifth tergite, faintly infuscated, the 

 pubescence short but densely distributed. Black ; legs golden yellow, 

 the coxae reddish-broAvn ; last joint of each tarsus inconspicuously 

 darker; basal six antennal joints golden yellow, the apical joints 

 dark brown; mandibles rufous, yellowish at tips. 



Male. — Length 2 mm. Characters common to both sexes are not 

 referred to in the description of the allotype. Pedicel slightly less 

 than twice as long, as wide as the scape at apex; third joint button- 

 shaped, wider than long, closely joined to the fourth and much nar- 

 rower than the fourth; fourth thicker than the scape at its widest 

 part, extraordinarily thickened, recalling the males in the genus Erit- 

 rissomerus; fifth joint very slightly longer than wide; following joints 

 longer than wide, becoming a little more elongated toward the apex of 

 the antenna; tenth joint narrower, three times as long as wide, as long 

 as the fifth and sixth united, sharply pointed apically; abdomen 

 spatulate, blunt posteriorly, as long as the head and thorax united, 

 wider at the apex of the second segment than the thorax across the 

 tegulae; wings extending half the length of the abdomen past its 

 apex. Antennae uniformly golden yellow. 



Type locality. — Greeley, Colorado. 



Type.~C&t. No. 2122, U.S.N.M. 



Redescribed from the type material in the United States Nationa 

 Museum. Ashmead's original type series consisted of four females 

 and two males. One of these males is not confusa, having (among 

 other differences) the legs and antennae dark brown. I have identi- 

 fied one of the male types of Platygaster nigrifemur Ashmead as 

 belonging to this species. 



