PTEROMALIDAE OF N.W. EUROPE 389 



4 (2) Fore wing with fuscous markings, at least a dark cloud below the stigma ; 



occiput not margined ; antennae with two anelli and six funicular seg- 

 ments ARTHROLYTUS Thomson (p. 789) 



- Fore wings immaculate or, if slightly infumate discally, then the occiput is 



finely margined .......... 5 



5 (4) Propodeum with a large reticulate nucha which projects well behind the bases 



of the hind coxae ; all coxae, and gaster more or less, red to reddish yellow. 

 Antennae with three anelli and five funicular segments. Occiput not 

 margined ..... Callitula pyrrhogaster (Walker) (p. 462) 



- Propodeum with a relatively smaller nucha which projects less strongly ; 



coxae and gaster dark with a metallic tinge. Antennae usually with two 

 anelli and six funicular segments. Occiput usually at least slightly mar- 

 gined ............ 6 



6 (5) Thorax flattened, at least 1 -5 times as broad as high, weakly arched dorsally ; 



head in dorsal view strongly transverse, 2-25 to 2-3 times as broad as its 

 maximum length . PLATYPTEROMALUS Boucek (p. 737) 

 Thorax not or hardly broader than high, usually strongly arched dorsally ; 

 head rarely so strongly transverse, usually not more than twice as broad as 

 long 7 



7 (6) Face receding strongly below the antennal toruli, and forming an angle of at 



most about no° with the frons ; mesoscutum and scutellum shiny, their 

 reticulation hardly raised above the general surface, or even partly engraved 



NASONIA Ashmead (p. 779) 



- Face not receding strongly, forming an angle of about 130 with the frons ; 



mesoscutum and scutellum less shiny, their reticulation distinctly raised 

 above the general surface . EUPTEROMALUS Kurdjumov (p. 737) 



8 (1) Antennal formula 11353 ; flagellum very stout and short, combined length 



of pedicellus and flagellum hardly two-thirds the breadth of the head. 

 POL slightly less than OOL. Genae fringed with black bristly hairs which 

 point downwards. Mesepisternum wholly reticulate. Clypeus large, 

 reticulate, its anterior margin virtually truncate. Body, and legs (especi- 

 ally femora) stout ; hind tibia with two spurs HABRITYS Thomson (p. 427) 

 If the antennal formula is 11353, then POL is not less than OOL, and the 

 genae are not fringed with black bristly hairs ; usually also the mesepi- 

 sternum has a partly smooth area below the base of the hind wing, the 

 clypeus is of different form or sculpture, and the hind tibia has only one 

 spur ............ 9 



9 (8) Notauli traceable to hind margin of mesoscutum, and sometimes sharply 



impressed throughout, though more often superficial posteriorly . . 10 



Notauli not nearly reaching the hind margin of the mesoscutum ... 12 



10 (9) Clypeus (cf. Text-fig. 287) reticulate, its anterior margin with two rounded 



lobes separated by an incision ; POL distinctly less than OOL ; notauli 

 sharply impressed throughout ; marginal vein of fore wing thickening only 

 gradually towards its base .... PERNIPHORA Ruschka (p. 428) 



- Clypeus either mainly to entirely striate, or its anterior margin of different 



form ; POL equal to or greater than OOL ; notauli sometimes superficial 

 posteriorly ; marginal vein sometimes thickened throughout . . . 11 



11 (10) Postero-lateral angles of propodeum dentate or sharp ; notauli sharply 



impressed throughout ; marginal vein not conspicuously thickened 



DORCATOMOPHAGA Kryger (p. 828) 

 Postero-lateral angles of propodeum not sharp ; notauli sharp throughout 

 or superficial posteriorly ; marginal vein often conspicuously thickened, 

 at least in its basal half ......... 12 



