PTEROMALIDAE OF N.W. EUROPE 377 



- Plicae present at hind margin of propodeum only ; or at least more or less 



effaced anteriorly and not reaching the base of the sclerite . . .142 



140 (139) Thorax not slender, in dorsal view 1-5 to 1-7 times as long as broad ; post- 



spiracular sclerite weakly and irregularly sculptured, usually more or less 

 smooth dorsally, with a curved impression in front. Spiracular sulci of 

 propodeum distinctly impressed, with some punctures or transverse 



costulae HABROCYTUS Thomson (p. 494) 



and PTEROMALUS Swederus (p. 488) 



- Either the thorax is slender, in dorsal view about twice as long as broad ; or 



the postspiracular sclerite is almost uniformly reticulate, without a distinct 

 impression in front. Spiracular sulci of propodeum sometimes shallow . 141 



141 (140) Antennal clava in profile appearing asymmetrical, its dorsal edge curved, its 



ventral edge nearly straight. Propodeum medially half or somewhat more 

 than half as long as scutellum . . CHLOROCYTUS Graham (p. 611) 



Antennal clava in profile appearing symmetrical or virtually so. Propodeum 



sometimes relatively shorter . . . . . . . .142 



142 (141) Antennal clava, unless abnormally collapsed, twice or somewhat more than 



twice as long as broad, at least as long as funicular segments 5 + 6. 

 Either the postmarginal vein of fore wing is not longer than the marginal 

 vein, or else the thorax is slender (length : breadth about 2:1) and the pro- 

 podeum is fully half as long as the scutellum. Body usually bright green to 

 blue, occasionally olive or bronze-green CHLOROCYTUS Graham (p. 611) 



- Antennal clava either less than twice as long as broad, or shorter than 



funicular segments 5+6. Postmarginal vein slightly longer than the 

 marginal vein. Thorax 1-65 to 1-75 times as long as broad. Propodeum 

 less than half as long as the scutellum except in violacea, which has a 

 notably transverse head (Text-fig. 428). Body sometimes olive-green, but 

 often with bronze to coppery or violet tinge . AGGELMA Delucchi (p. 580) 



x 43 ( J 33) Thorax depressed ; the mesoscutum, scutellum, and propodeum all lying in 

 the same or nearly the same plane ; scutellum in profile flat or virtually 

 so ; either the distal third or so of the basal cell in the fore wing pilose, or 

 else the antennae are inserted below the ventral edge of the eyes 



ANOGMUS Forster (p. 628) 



- Thorax distinctly arched dorsally ; dorsal surface of scutellum in profile at 



least slightly convex ; basal cell of fore wing often bare ; antennae inserted 



level with or above the ventral edge of the eyes . . . . .144 



144 (143) Antennae inserted distinctly above the level of the ventral edge of the eyes 145 



- Lower edge of antennal toruli level with or hardly above a line joining the 



ventral edges of the eyes . . . . . . . . • 153 



145 (144) Basal cell of fore wing, not counting a row of hairs which is sometimes 



present on the basal vein bare, or virtually bare . . . . .146 



- Basal cell of fore wing pilose over its distal quarter to half . . . 153 



146 (145) Marginal vein of fore wing about 1-5 times as long as the stigmal vein ; tip 



of hypopygium situated very distinctly beyond the middle of the gaster ; 

 eyes about 1 -5 times as long as broad ; both mandibles with four teeth 



SPINTHERUS Thomson (p. 480) 

 Either the marginal vein is nearly or quite twice as long as the stigmal vein ; 

 or the tip of the hypopygium is situated at most half way along the gaster. 

 Eyes usually less elongate. Left mandible often with three teeth . . 147 



147 (146) Antennal clava in profile appearing asymmetrical, its dorsal edge curved, its 



ventral edge nearly straight. 



Propodeum medially half or somewhat more than half as long as the 



