ART. 15». REVISION OF SUBFAMILY PLATYGASTERINAE FOUTS. 71 



36. PLATYG ASTER VITICOLA (Ashmead). 



Polygnotus viticola Ashmead, Bull. 45, U. S. Nat. Mus., 1893, p. .31.3.— Brues, 

 Bull. 22, Conn. Geol. Nat. Hist. Surv., 1916 (1917), p. 527. 



Female. — Length 1.9 mm. Head twice as wide as long, not at all 

 excavated behind, the cheeks straight, oblique; occiput strongly stri- 

 ate, the striae curved; cheeks striate (except narrowly anteriorly 

 where they arc unsculptured) ; vertex subacute, striate on the sides 

 and smooth medially; interocellar area finely shagreened; frons cov- 

 ered with extremely closely placed obliquely directed aciculae; anten- 

 nae stout, the flagellum (including the pedicel) a little shorter than 

 the thorax; club joints wider than long; thorax about three-fourths 

 as wide as long; pronotum shagreened above on the sides, below 

 finely aciculate, polished posteriorly; median area wider than long, 

 narrowed posteriorly, finely shagreened in front and polished behind; 

 mesonotum convex, finely shagreened all over, less distinctly so on 

 lateral lobes medially; notauli distinct, not sharply indicated on 

 anterior half of mesonotum ; median lobe broadly rounded posteriorly ; 

 metapleurae, propodeum, first sternite, and second sternite basally, 

 are all covered very densely with beautiful silver hairs; first and 

 second tergites not pubescent; abdomen as long as the head and 

 thorax united, as long as in atriplicis, a little over three-fourths as wide 

 as the thorax, convex above and below; first and second tergites highly 

 polished; first very slightly elevated anteriorly, the median area flat- 

 tened, traversed longitudinally by three low carinae; basal foveae on 

 second tergite narrow and rather shallow; striae extending to the 

 middle of the segment; no striae between foveae; tergites three and 

 four each with a row of pits across their center from every one of 

 which projects a short white hair ; fifth tergite very strongly shagreened 

 except on extreme apex, with scattered punctures medially near the 

 base; sixth tergite more finely shagreened, not punctate; Avings hya- 

 line, extending a little beyond the apex of the abdomen. Black to 

 dark reddish-brown, shining; antennae piceous; legs brown, the tarsi 

 and tibiae lighter, touched with yellow; last joint of each tarsus 

 piceous. 



Male. — Length 1.3 mm. Antennae stout; pedicel twice as long as 

 wide; third joint wider than long, as wide as the pedicel ; fourth broad 

 and flattened, hardly narrowed basally, much wider than the pedicel; 

 joints five and six a little longer than wide, as wide as and slightly 

 longer than joints seven to nine (which are about as long as wide), 

 pilose; last joint as wide as the ninth, a little shorter than the third 

 and fourth united, conical, sharply pointed apically; abdomen long 

 and slender, slightly over twice as long as wide, a little shorter than 

 the head and thorax combined, narrower than the thorax, rounded 

 559&— 24— Proe.X.M.vol.G.3 23 



