PTEROMALIDAE OF N.W. EUROPE 357 



propodeum with at least some trace of a transverse costula ; body bluish 

 or bronze-black ; mandibles similar, both with three acute teeth 



PSILOCERA Walker (p. 462) 

 Either at most the first gastral tergite is incised posteriorly ; or if the hind 

 margin of some of the following tergites is slightly emarginate, then the 

 antennal clava has only a small area of micropilosity, and the other 

 characters do not all agree with the above . . . . . . 22 



22 (21) Second flagellar segment large, quadrate, only slightly shorter than the third, 



usually provided with sensilla ; marginal vein of fore wing thickened in its 

 proximal half (Text- fig. 291) ; head protuberant at level of antennal 

 toruli, face receding almost horizontally ; antennal scape very long, much 

 longer than an eye . . MUSCIDIFURAX Girault & Saunders (p. 822) 



Second flagellar segment usually small and anelliform without sensilla ; if 

 approaching the third segment in size, then the marginal vein of the fore- 

 wing is not thickened ......... 23 



23 (22) Antennae with two anelli and six funicular segments .... 24 

 - Antennae with three anelli and five funicular segments . . . .168 



24 (23) Postmarginal vein of fore wing (Text-figs. 293, 294, 296) approximately 



equal in length to, or even slightly shorter than, the stigmal vein. In 

 most species either the gaster is subcircular, or else the apical margin of the 

 fore wing lacks cilia at least over a short space between the postmarginal 

 vein and the tip of the wing ........ 25 



Postmarginal vein of fore wing at least slightly longer than the stigmal vein 38 



25 (24) Head compressed antero-posteriorly, hence appearing very transverse in 



dorsal view (2-2 to 2-3 times as broad as long ) ; thorax flattened, distinctly 

 broader than high, hardly arched dorsally ; scutellum virtually flat in the 

 longitudinal axis, broader than long, very shiny discally where its sculpture 



is obsolescent PLATNEPTIS Boucek (p. 800) 



Head not so compressed, in dorsal view at most about twice as broad as 

 long ; thorax more or less distinctly arched dorsally, if only weakly so 

 then the scutellum is distinctly reticulate all over ..... 26 



26 (25) Propodeum with a distinct, strongly reticulate nucha ; mesoscutum and 



scutellum with delicate, for the most part engraved, reticulation 



cf. NASONIA (p. 799) 

 Propodeal nucha represented by a sublunate strip which is weakly sculptured, 

 transversely aciculate, or with reticulation having areoles elongated in the 

 transverse axis ; mesoscutum and scutellum having reticulation at least 

 slightly raised above the general surface . . . . . . 27 



27 (26) Marginal vein of fore wing (Text-fig. 292) 3-5 to 4 times as long as the stigmal 



vein ; wing beyond the speculum, and especially below the marginal vein, 

 densely pilose ; POL about twice OOL ; hind corners of propodeum pro- 

 minent, almost dentiform. Antennae inserted below level of ventral edge 

 of eyes ; flagellum slender, hardly stouter than the pedicellus. Gaster 

 broad, subcircular .... STICHOCREPIS Forster (p. 822) 



Marginal vein of fore wing at most three times as long as the stigmal vein ; 

 if as much as three times, then the wing is less densely pilose below the 

 marginal vein, POL is distinctly less than twice OOL, and the hind 

 corners of the propodeum are not prominent, often also the gaster is ovate 28 



28 (27) Eyes with rather long and conspicuous hairs. Antennal flagellum strongly 



clavate ; clava ventrally with a large area of micropilosity which extends 

 nearly to its base . Fore wing with basal cell more or less extensively pilose ; 

 speculum rather small, closed below ; apical margin of wing ciliate. 

 Occiput margined. Gaster subcircular . DIGLOCHIS Forster (p. 782) 



