ART. 15». EEVISION OF SUBFAMILY PLATYGASTEEINAE FOUTS. 105 



ond tergito elevated anteriorly, with a short median carina, and sev- 

 veral inconspicuous striae to either side of it; last four tergites united 

 three-fourths as long as the second, slightly shorter than the width 

 of the third; sixth tergite broader than long, distinctly shorter than 

 three and four united, subacute apically; wings hyaline, extending 

 beyond the apex of the abdomen. Coloration as in astericola Ashmead. 



Type locality. — Holderness, New Hampshire. 



Type.— Cat. No. 25445, U.S.N.M. Two paratypes in Collection 

 Fouts. 



Described from four female specimens originally included by Ash- 

 mead in the type series of Platygaster astericola and with the same 

 ecological data. 



This species differs from variabilis and vernoniae in not having the 

 abdomen longer the head and thorax united, and from ruhi in having 

 the striae on the second tergite faint and not extending beyond the 

 the middle of the segment. This character seems to be the only one 

 separating relativa from ruhi and it may be that they are synony- 

 mous in spite of their different host records. 



The relative length of the wings and abdomen varies somewhat. 

 The wings may extend the length of the last four segments or only 

 the length of segment six past the apex of the abdomen. 



71. PLATYGASTER VERNONIAE (Ashmead). 



Polygnotus vernoniae Ashmead, Bull. 45, U. S. Nat. Mus., 1893, p. 317.— Brues, 

 Bull. 22, Conn. Geol. Nat. Hist. Surv., 1916 (1917), p. 539. 



Female. — Length 1 mm. Closely related to rohweri Fouts, but 

 the abdomen not so elongate; head distinctly less than twice as wide 

 as long, not emarginate behind; occiput transversely aciculate; cheeks 

 subconvex, shagreened above; interocellar area finely aciculate; space 

 around lateral ocelli indistinctly aciculate; frons mostly polished, 

 with a few faint diagonally directed aciculae below; antennae short, 

 the fiagellum (including pedicel) distinctly shorter than the thorax ; 

 pedicel twice as long as wide, about as ^\^lde as joint six; joint three 

 much narrower and less than half as long as two, two-thirds as long 

 and a little narrower than four; four a little longer than six. not quite 

 as wide, slightly longer and wider than five; joints seven to nine as 

 wide as long, slightly widened apically; ten shorter than three and 

 four united; thorax as in rohweri, higher than wide, strongly convex 

 above; pronotum aciculate laterally, polished posteriorly; mesono.tum 

 mostly unsculptured, shagreened anteriorly; notauli distinct on basal 

 half of mesonotum, mdely separated behind, the median lobe broadly 

 rounded posteriorly; scutellum transverse, strongly convex, margined 

 laterally, polished, sparsely covered with Avliite pubescence on the 

 sides and above; abdomen shaped as in rohweri but not so elongate, 

 a little longer than the head and thorax united, narrower than the 



