PTEROMALIDAE OF N.W. EUROPE 361 



42 (41) One or two bristles of each pygostyle (Text-figs. 344, 349) much longer than 

 the others (only a few species have this character) . . . . .43 



Pygostylar bristles subequal in length, relatively shorter than in the above 



(the majority of species) ......... 44 



43 (42) Pronotal collar rounded off in front ; gaster not pale-marked ; hind corners 

 of propodeum in dorsal view appearing prominent, rectangular or acute, 

 the callus with a longitudinal ridge (Text-fig. 313). Fore wing immaculate. 

 Propodeum with a distinct, reticulate nucha, usually also with at least 

 some trace of a costula . . . LARIOPHAGUS Crawford (p. 823) 



Either the pronotal collar is sharply margined ; or the gaster is more or less 

 extensively red basally. Hind corners of propodeum in dorsal view 

 rounded, not prominent, callus without a longitudinal ridge. Fore wing 

 sometimes with fuscous markings ....... 44 



44 (43) Occiput finely to sharply margined at least medially (care is needed, as when 

 the margin is fine it might be overlooked) ...... 45 



- Occiput not margined . . . . . . . . . .51 



45 (44) Vertex curving over strongly into the occipital surface, the occipital carina at 

 least slightly nearer to the foramen magnum than to the hind ocelli. 

 Propodeum most often with a distinct and strongly reticulate nucha. . 46 



Vertex forming a rather abrupt edge with the occipital surface, the transverse 

 ridge which separates them (Text-figs. 437, 438, 440) quite near the hind 

 ocelli ; propodeal nucha represented merely by a narrow, weakly sculp- 

 tured, transverse strip (some Holcaeus) ....... 80 



46 (45) Antennal clava ventrally with a large area of micropilosity which extends 

 nearly to its base ; flagellum strongly clavate ; postmarginal vein of fore 

 wing at most slightly longer than the stigmal vein ; gaster subcircular, 

 obtuse apically ; propodeum with nucha not well developed ; eyes with 

 rather long and conspicuous hairs . . DIGLOCHIS Forster (p. 782) 



Antennal clava with only a small area of micropilosity on its third segment ; 

 postmarginal vein usually distinctly, rarely only slightly, longer than the 

 stigmal vein ; gaster ovate to sublanceolate, pointed apically ; propodeum 

 with a well-developed, often large, reticulate nucha .... 47 



47 (46) Fore wing almost wholly pilose, the speculum absent or small. Eyes with 

 rather long and conspicuous hairs . . UROLEPIS Walker (p. 780) 



— Fore wing with a large speculum ; basal cell at least partly bare. Eyes with 

 less conspicuous hairs, sometimes virtually bare ..... 48 



48 (47) Face receding strongly towards the oral cavity and forming an angle of only 

 about 110° with the frons, as seen in profile ; mesoscutum and scutellum, 

 at least mainly, with delicate engraved reticulation 



NASONIA Ashmead (p. 779) 

 Face receding less strongly and forming a more obtuse angle, usually about 

 130 with the frons ; reticulation of mesoscutum and scutellum at least 

 very slightly raised above the general surface ..... 49 



49 (48) Hind coxae with some hairs dorsally in the proximal half. Fore wing basally 

 with a band of fine hairs just above the anal margin, on lower surface of 

 wing. Anterior margin of clypeus virtually truncate 



GYRINOPHAGUS Ruschka (p. 777) 

 Hind coxae bare dorsally. Fore wing lacking the above band of hairs. 



Anterior margin of clypeus usually more or less emarginate ... 50 



50 (49) Thorax not or hardly broader than high, distinctly arched dorsally in the 

 long axis. Head in dorsal view with temples at least one fifth as long 

 as eyes EUPTEROMALUS Kurdjumov (p. 737) 



