PTEROMALIDAE OF N.W. EUROPE 833 



smooth or virtually so, and marked off by a very distinct constriction. 

 Gaster of female generally 2-2-5 times, occasionally a little less than twice, 

 as long as broad ...... cremifaniae Delucchi (p. 838) 



Thorax moderately strongly arched dorsally, scutellum in profile appearing 

 more convex ; propodeum sloping at a relatively steeper angle, often 

 rather longer than in cremifaniae ; nucha mainly to entirely reticulate or 

 transversely aciculate. Gaster of female at least slightly less than twice as 

 long as broad, average about 1-5 times ....... 7 



(6) Lamina of gena ending, next to base of mandible, in an acute point (Text-fig. 



680). Costal cell of fore wing (upper surface) with a row of hairs extending 

 over its distal third to half ..... grande Thomson (p. 837) 

 Lamina of gena (Text-figs. 681-684) ending in a blunt or rounded lobe which 

 is sometimes not very prominent. Costal cell of fore wing (upper surface) 

 bare ............. 8 



(7) Fore wing with marginal vein a little shorter than the stigmal vein ; basal 



vein usually bare, rarely with 1-2 isolated hairs. Lamina of gena (Text- 

 figs. 681, 682) more prominent .... formosum Walker (p. 836) 



Fore wing with marginal vein approximately as long as, or slightly longer 

 than, the stigmal vein ; basal vein with 2-12 hairs. Lamina of gena 

 (Text-figs. 683, 684) less prominent . . umbratum Delucchi (p. 834) 



(3) Fore wing with marginal vein thick, only 2-7-3 times as long as its maximum 

 breadth ; speculum open below. Antennae of female with 3 strongly 

 transverse anelli and 5 funicular segments ; gaster short and broad. 

 Thorax very strongly arched dorsally ; propodeum sloping at an angle of 

 about 6o° relative to the tangential plane of the mesoscutum and scutellum. 

 Gastral petiole not longer than broad, virtually smooth 



aphidis (Bouche) (p. 842) 



Fore wing with marginal vein less thick, 4-5 times as long as its maximum 

 breadth ; speculum closed or nearly closed below. Antennae of female 

 with 2 anelli and 6 funicular segments, in small specimens the first funicular 

 segment may be somewhat shorter than the second and slightly transverse, 

 but it is never markedly anelliform. Female gaster relatively longer. 

 Thorax at least rather less strongly arched dorsally . . . . 10 



(9) Female with gastral petiole slightly less than half as long as the propodeum, 

 slightly broader than long, nearly or quite smooth ; gaster 2-2-4 times as 

 long as broad. Propodeal nucha weakly aciculate transversely, or nearly 

 smooth, its front edge distinctly defined. Thorax not very strongly 

 arched dorsally ...... vitodurense Delucchi (p. 841) 



Female with gastral petiole at least two thirds as long as the propodeum, 

 1-5-1-8 times as long as broad, its dorsal surface, not counting the basal 

 stalk, transversely aciculate or aciculate-reticulate ; gaster at least slightly 

 less than twice as long as broad. Propodeal nucha finely reticulate, its 

 front edge not distinctly defined. Thorax moderately strongly arched 

 dorsally ............ 11 



(10) Fore wing with upper surface of basal cell with 10-17 hairs. Female with 

 first funicular segment of antenna (Text-fig. 679) from virtually as long as, 

 to slightly longer than, the pedicellus, quadrate or slightly longer than 

 broad. 



Some specimens might run here if the clypeus is viewed from a rather 

 more dorsal direction ..... cf. solitarium (Hartig) (p. 838) 



Fore wing with upper surface of basal cell bare or with at most 5 hairs. 

 Female with first funicular segment at most three quarters as long as the 



