720 M. W. R. de V. GRAHAM 



Trichomalus oxygyne sp. n. 



(Text-fig. (584)) 



$. Body greenish bronze or dark bluish ; disc of gaster bronze-black. Antennae fuscous ; 

 scape testaceous at base, or mainly so. Coxae concolorous with thorax ; trochanters testa- 

 ceous ; femora fuscous, their tips fairly broadly testaceous ; tibiae and tarsi testaceous, the 

 tibiae usually somewhat infuscate medially, tips of tarsi brown. Tegulae fuscous, or partly 

 testaceous. Wings slightly tinged with grey ; venation brownish testaceous, the stigma a 

 little darker. Length 2-5-2-8 mm. 



Head barely 1-2 times as broad as mesoscutum ; in dorsal view 2-1-2-2 times as broad as 

 long, with temples converging rather strongly and one quarter as long as eyes or slightly more ; 

 POL 1-5-1-65 OOL. Eyes separated by about 1-4 times their length. Malar space slightly 

 less than half the length of an eye. Clypeus strigose, its anterior margin truncate or very 

 weakly emarginate. Head moderately finely reticulate, the genae finely so. Antennae with 

 toruli about equidistant from the anterior margin of the clypeus and the median ocellus ; 

 scape almost reaching the vertex ; combined length of pedicellus and flagellum approximately 

 equal to breadth of head ; pedicellus virtually twice as long as broad, slightly longer than the 

 first funicular segment ; flagellum rather slender, subclavate ; funicle proximally only slightly 

 stouter than the pedicellus ; funicular segments subquadrate, or the proximal segments very 

 slightly longer than broad, the sixth, and sometimes the fifth, very slightly transverse ; sensilla 

 not very numerous, in one row on each segment. 



Thorax 1 -6-1-8 times as long as broad. Mesoscutum 1-6-1-7 times as broad as long, finely 

 reticulate laterally, rather more coarsely so on the disc. Scutellum slightly longer than broad ; 

 slightly more finely, or as coarsely, reticulate as the disc of the mesoscutum. Propodeum 

 medially about two thirds as long as the scutellum and produced well beyond the bases of the 

 hind coxae ; median area 1 -3-1 -4 times as broad as long ; median carina strong, often raised ; 

 panels of median area strongly though finely, nearly uniformly reticulate ; costula sometimes 

 slightly indicated ; nucha occupying about one third the median length of the propodeum, 

 convex, strongly and more coarsely reticulate than the panels of the median area ; callus, 

 except around the spiracle, thickly pilose. Hind coxa thickly pilose dorsally. Fore wing with 

 basal cell bare, or with a few hairs distally, open below ; basal vein pilose ; speculum open 

 below ; surface beyond the speculum moderately thickly pilose ; marginal vein 1-6-1-9 times 

 as long as the stigmal vein, and 1-2-1-35 times as long as the postmarginal vein. 



Gaster lanceolate, slightly longer than head plus thorax, 2-2-2-5 times as long as broad ; 

 last tergite as long as, or slightly longer than (up to 1-3 times) its basal breadth ; sides of basal 

 tergite with a conspicuous patch of whitish hairs at the base, the hind margin of the tergite 

 entire or hardly at all emarginate medially. 



o*. Unknown. 



Holotype $. England : Berkshire, Wytham, 22.ix.1951 (Graham), in Hope 

 Department, University Museum, Oxford. 



Paratypes. Same locality as holotype, 1 $, 31. v. 1952 (Graham), in Graham 

 collection. 



Scotland : Mid Perth, Lawers, 1 $, 19.vii.1952 (Graham), in Graham collection. 



Closely resembles the female of posticus (Walker) but differs in its longer gaster ; 

 in posticus this is ovate, 1 -6-i -9 times as long as broad, at least slightly shorter 

 than head plus thorax. 



Biology. Unknown. 



