PTEROMALIDAE OF N.W. EUROPE 651 



of head ; third flagellar segment most often transverse, rarely longer than 

 broad ............ 11 



11 (10) Marginal vein strongly inflated, convex, hardly five times as long as its 



maximum breadth. 



Antennae with three anelli and five funicular segments. Head and 

 thorax green ; antennal scape, and legs except coxae yellow. Plicae of 

 propodeum usually sharp only posteriorly . . morys (Walker) (p. 653) 



Marginal vein not inflated, relatively thinner, at least six times as long as its 



maximum breadth .......... 12 



12 (11) Antennal flagellum yellow with its sixth segment, occasionally also the fifth 



or seventh, brown to black ; clava extensively infuscate, sometimes mainly 

 dark. 



Gaster often with a pale transverse band or spot . . . . . 13 



Antennal flagellum differently coloured ; never with one or more of its middle 



segments alone dark ; clava sometimes less extensively infuscate . . 14 



13 (12) Pronotal collar longer, medially from slightly more than one sixth, to nearly 



one quarter, as long as mesoscutum. Antennae with shiny boss on front 

 edge of scape extending at most half way down ; third flagellar segment 

 often similar to the fourth, in such cases the funicle has six segments. 

 Anterior margin of clypeus rather deeply emarginate. Fore femora often 

 with a dark spot at the base beneath . . amaenus (Walker) (p. 676) 



Pronotal collar shorter, medially from hardly one seventh, to one sixth, as long 

 as the mesoscutum. Antennae with shiny boss on front edge of scape 

 extending more than half way down ; third flagellar segment anelliform, at 

 most slightly more than half as long as the fourth segment, without sensilla. 

 Anterior margin of clypeus less deeply emarginate. Fore femora wholly 

 yellow ........ dubius (Walker) (p. 674) 



14 (12) Pronotal collar unusually long, medially from slightly more than one sixth, 



to nearly one quarter, as long as the mesoscutum. Anterior margin of 

 clypeus (Text-fig. 526) rather deeply emarginate amaenus (Walker) (p. 676) 

 Pronotal collar usually relatively shorter medially, if approaching the above 



then the anterior margin of the clypeus is shallowly emarginate. . . 15 



15 (14) Gaster with a yellowish transverse band, or a distinct yellowish spot . . 16 



Gaster nearly always immaculate, rarely with an extremely small and faint 



spot visible by transmitted light . . . . . . . .21 



16 (15) Antennal clava large, only a little longer than broad, obtuse apically, black 



or blue-black. Length of mid tibial spur not greater than the maximum 

 breadth of the tibia ..... mediterraneus (Mayr) (p. 668) 

 Antennal clava smaller, 1-7 to 2 times as long as broad, more or less pointed 

 apically, usually only partly black or brown. Length of mid tibial spur, 

 except in aspilus, greater than the maximum breadth of the tibia . . 17 



17 (16) Length of mid tibial spur hardly as great as the maximum breadth of the tibia. 



Marginal vein at most 1-5 times as long as the stigmal vein. Antennal fun- 

 icle yellowish, usually slightly infuscate proximally aspilus (Walker) (p. 669) 

 Length of mid tibial spur slightly greater than the maximum breadth of the 

 tibia. Marginal vein usually 1 -7 to 1 -g (occasionally only 1 -6) times as long 

 as the stigmal vein. Antennal funicle entirely yellow . . . . 18 



18 (17) Antennae with third flagellar segment quadrate or distinctly longer than 



broad, often provided with sensilla, the funicle therefore six- or virtually 

 six-segmented ; distal segments of funicle quadrate ; some of the other 

 proximal segments of the funicle usually longer than broad . . . 19 



Antennae with third flagellar segment anelliform, distinctly transverse, 



