ART. 15». REVISION OF SUBFAMILY PLAT YGASTERINAE FOUTS. 85 



longer than wide at base, abruptly subacute at the apex; thorax 

 distinctly less than twice as long as wide, broadly rounded anteriorly, 

 abruptly narrowed behind the tegulae; notauli complete; mcsonotum 

 a little longer than wide, with two short subobsolete carinae anteriorly ; 

 middle lobe and upper part of lateral lobes strongly shagreened ; upper 

 part of pronotum rather finely shagreened; legs stout, femora and 

 tibiae strongly^ clavate; wings covered with brown pubescence, 

 extending about to the apex of the fifth abdominal segment; abdomen 

 about twice as long as the thorax; first tergite twice as wide as 

 long, not striate, the dorso-lateral carinae prominent, the space 

 between them about twice as long as wide; second sternite, meta- 

 pleurae, propodeum laterally, hind coxae below, and foveae basally 

 (on second tergite) densely covered with long grayish- white hairs; 

 second segment almost as wide at the apex as long, very closely 

 joined to the first, as wide at the apex as the thorax across the 

 tegulae, widest at the apex and narrowing gradually to the base, the 

 sides continuous with those of the first tergite; basal foveae on second 

 tergite deep and rather broad, with six or seven striae extending pos- 

 teriorly from their inner margins to the middle of the segment; 

 abdomen from the apex of the second segment narrowing gradually to 

 an acute point at tip; third segment about one and one-half times 

 as wide as long, without pubescence, the sides oblique; fourth as 

 wide .at the apex as long, wider basally than apically, nearly twice 

 as long as the third, with a few scattered hairs laterally; fifth tergite 

 one and three-fifths times as long as wide, with scattered white 

 hairs laterally, about twice as long as the third and considerably nar- 

 rower than that segment, the sides parallel; sixth tergite triangular, 

 one and one-half times longer than wide at the base, acute at tip, 

 two-thirds as long as the fifth. Shining black, legs (except last tar- 

 sal joints which are fuscous), and scape, rufous; fiagellum fuscous. 



Type locality. — Washington, District of Columbia. 



Type.— C^i. No. 24596,^U.S.N.M. 



Redescribed from the type specimen. 



6. PLATYGASTER LAEVICOLLI9 (Ashmead). 



Polygnotus laevicollis Ashmead, Bull. 45, U. S. Nat. Mus., 1893, p. 320. 



Male. — Length 1 mm. Head seen from above two and one- 

 half times as long as wide, not excavated posteriorly, slightly 

 convex anteriorly; occiput moderately shagreened; cheeks for the 

 most part unsculpturod ; vertex shagreened on the sides, transversely 

 striate medially; ocellar space finely shagreened; upper part of frons 

 finel}^ shagreened, more delicately so medially; face above insertion 

 of antennae transversely striate; projection between antennae quad- 

 rate, truncate apically, with the lateral edges raised into ridges; 



