PTEROMALIDAE OF N.W. EUROPE 191 



10 (9) Propodeum medially hardly half as long as the scutellum, sloping at a steep 



angle (about 6o°) relative to the plane of the mesoscutum and scutellum ; 

 its hind margin virtually truncate, not counting the petiolar foramen. 

 Combined length of pedicellus and flagellum about 1-45 times breadth of 

 head. Marginal vein of fore wing 1-4 to 1-5 times as long as the stigmal 

 vein. Thorax in dorsal view about 1 -65 times as long as broad 



? parviclava (Thomson) (p. 199) 



- Propodeum medially from fully half, to nearly two-thirds, as long as the 



scutellum, sloping at an angle of 45 to 50 relative to the plane of the 

 mesoscutum and scutellum ; its hind margin very slightly produced in 

 the middle beyond the bases of the hind coxae. Combined length of 

 pedicellus and flagellum 1-35 to 1-4 times breadth of head . . . . 11 



11 (10) Marginal vein of fore wing 1 -4 to 1 -5 times as long as the stigmal vein. Thorax 



in dorsal view about 1-65 times as long as broad . ? genale (Thomson) (p. 197) 

 Marginal vein of fore wing 1 -65 to 1 -8 times as long as the stigmal vein. Thorax 



in dorsal view about 1-75 times as long as broad .... sp. indet. 



12 (8) Thorax short, in dorsal view barely i-6 times as long as broad. Malar space 



approximately one third the length of an eye. Antennal scape reaching the 

 median ocellus ; the smooth shiny area on the distal part of its outer 

 aspect poorly-defined and extending hardly half way down. Thorax, 

 excluding propodeum, dull bronze, varied with violet especially on the 

 mesoscutum and scutellum ..... aeneum (Walker) (p. 199) 

 Thorax longer, in dorsal view 1 -75 to 2 times as long as broad. Malar space at 

 least slightly more than one third the length of an eye. Antennal scape 

 sometimes not reaching the median ocellus, sometimes with a large shiny boss 

 on its outer surface. Thorax most often some tint of green or blue . . 13 



13 (12) Malar space nearly or quite half the length of an eye. Antennal scape (Text- 



fig. 162) 3-5 to 3-8 times as long as broad, reaching (unless the head is 

 distorted) to the middle or top of the median ocellus, only slightly ex- 

 panded above the middle, its external aspect with only a very small boss 

 (b) which extends at most half way down. Stigma of fore wing relatively 

 small, separated by 2-5 to 3 times its height from the costal edge of the 

 wing. Antennal flagellum slender, its hairs sparser and tending to stand 

 out less strongly than in the following species . tar sale (Walker) (p. 201) 



- Malar space two fifths the length of an eye or slightly less. Antennal scape 



(Text-figs. 156, 163) 2-5 to 3 times as long as broad, reaching at most to the 

 lower edge of the median ocellus, distinctly expanded above the middle, its 

 external aspect with a conspicuous shiny boss which often extends more 

 than half way down. Stigma of fore wing tending to be relatively larger. 

 Antennal flagellum with its hairs tending to be more numerous and standing 

 out more strongly .......... 14 



14 (13) Antenna : combined length of pedicellus and flagellum only 1-4 to 1-45 



times breadth of head ; first funicular segment at most twice, sixth at most 

 1-5 times, as long as broad. Head in dorsal view only 2-05 to 2-15 times 

 as broad as long. Mid tarsi with their first, and sometimes also the second, 

 segment wholly testaceous, the rest brownish ; mid tibia usually extensively 

 infuscate ........ sabbas (Walker) (p. 194) 



- Antenna : combined length of pedicellus and flagellum i-6 to 1-75 times 



breadth of head ; first funicular segment 2 to 2-5, sixth 1-5 to i-8 times, as 

 long as broad. Head sometimes relatively more transverse. Mid tarsi, 

 except in some alpestre, blackish with only the base of their first segment 

 pale ; mid tibiae usually brown or black at their tips, sometimes more 

 extensively infuscate . . . . . . . . . 15 



