646 M. W. R. de V. GRAHAM 



31 (30) Sculpture of median area of propodeum about as strong as that on the disc of 



the scutellum. Pronotal collar often sharply margined except at the sides 32 



- Sculpture of median area of propodeum distinctly weaker than that on the 



disc of the scutellum. Pronotal collar sometimes weakly margined, occa- 

 sionally margined in the middle only . . . . . . . 33 



32 (31) Plicae, in their posterior half, straight or slightly sinuate inwards. Fore wing 



usually with a small brownish cloud on, or below but touching, the stigmal 



vein ........ subfumatus (Thomson) (p. 678) 



- Plicae of propodeum almost evenly curved. Fore wing immaculate 



sp. indet. B (p. 673) 



33 (31) Mesoscutum with some shallow though distinct piliferous punctures, most 



clearly visible on its front part ........ 34 



- Mesoscutum without piliferous punctures ....... 36 



34 (33) Mesoscutum with several piliferous punctures, i-6 to i-8 times as broad as 



long. Median area of propodeum with moderately strong, reticulate or 

 obliquely strigose-reticulate sculpture. Species associated with Cynipid 

 galls on Quercus ........... 35 



- Mesoscutum with only a few piliferous punctures in its front part ; either the 



mesoscutum is relatively less transverse, or the median area of the propo- 

 deum is shiny with very weak sculpture. Species not associated with 

 Cynipid galls on Quercus ......... 36 



35 (34) Tip of hypopygium situated at nearly two thirds the length of the gaster. 



Legs very dark, the femora mainly to entirely black, the tibiae heavily 

 infuscate. Median area of propodeum rather shiny, with delicate sculpture 



fuscipes (Walker) (p. 675) 



- Tip of hypopygium situated hardly beyond the middle of the gaster. Legs 



relatively paler. Median area of propodeum with relatively strong reticu- 

 late or strigose reticulate sculpture . . . dubius (Walker) (p. 674) 



36 (34) Pronotal collar (Text-fig. 532) long, medially one seventh to one sixth as long 



as the mesoscutum, coarsely reticulate. Squat species with gaster slightly 

 shorter than head plus thorax, and at least slightly less than twice as long 

 as broad. Head and thorax golden green to blue longicollis sp. n. (p. 671) 



- Either the pronotal collar, medially, is at most one eighth as long as the 



mesoscutum ; or the gaster is about as long as head plus thorax and at 

 least twice as long as broad, and the head and thorax are bronze-green to 

 bronze ............ 37 



37 (36) Marginal vein of fore wing 1-4 to i-6 (rarely 1-7) times as long as the stigmal 



vein. Thorax 1 -4 to 1 -5 times as long as broad ..... 38 



- Marginal vein usually 2 to 2-2 times as long as the stigmal vein, rarely some- 



what less than 2 times, but then the thorax nearly 1 -7 times as long as broad 39 



38 (37) Mid tibia (Text-fig. 536) six to seven times as long as broad, usually with a dark 



stripe along its inner edge. Malar space from two fifths, to nearly half, 

 the length of an eye. Median area of propodeum slightly more than twice 

 as broad as long. Head in dorsal view usually 2-05 to 2-25 times as broad 

 as long (Text-fig. 534) ..... diffinis (Walker) (p. 669) 



Mid tibia (Text-fig. 535) eight to nine times as long as broad, without a distinct 

 dark stripe on its inner edge. Malar space two fifths the length of an eye or 

 slightly less. Median area of propodeum about twice as broad as long. 

 Head in dorsal view 1-95 to 2-05 times as broad as long 



mediterraneus (Mayr) (p. 668) 



39 (37) Malar space only about one third the length of an eye, the latter about i-6 



times as long as broad. Face with a prominent boss just below the antennal 

 toruli. Body greenish bronze to bronze ; legs brownish testaceous with 



