280 M. W. R. de V. GRAHAM 



24 (23) Fore and mid coxae fulvous, or with at most a dark spot basally ; hind coxa 



usually with its distal third or more fulvous, occasionally almost entirely 

 metallic ; femora fulvous, or at most very slightly brownish proximally. 

 Antennal scape at most infuscate at apex dorsally. Malar space about two 

 thirds the length of an eye ; breadth of oral fossa 1 -47 to 1 -7 times the malar 

 space ; clypeus at most 1-5 times as broad as long. Head in dorsal view 

 (Text-fig. 234) only i-8 to 2 times as broad as long ; temples not obviously 

 convergent behind eyes. Head and thorax with strong sculpture, rather 

 dull ; bristles of scutellum short . . . . .... 25 



- All coxae most often entirely metallic, occasionally the fore coxae fulvous 



distally, femora at least slightly infuscate at base, most often their proximal 

 one third to three quarters fuscous with a metallic tinge. Antennal scape 

 often more heavily infuscate, sometimes entirely so. Except in longigena 

 the malar space is at most slightly more than half the length of an eye, and 

 the breadth of the oral fossa is i-q to 2-5 times the malar space. If the 

 head is similar in shape to the above, then the head and thorax are less 

 strongly sculptured and relatively shiny, the propodeum is more or less 

 shiny, and the scutellar bristles are longer ...... 26 



25 (24) Anterior margin of clypeus moderately curved. Thorax relatively longer, 



1-7 to i-8 times as long as broad ; dorsellum strongly reticulate and 

 relatively dull. Speculum of fore wing open below. 



Head, Text-fig. 234 ...... fulvicoxis sp. n. (p. 304) 



- Anterior margin of clypeus almost angulate medially. Thorax relatively 



shorter, about 1-65 times as long as broad ; dorsellum delicately reticulate 

 and moderately shiny. Speculum of fore wing partly or completely closed 

 below ........ triandrae sp. n. (p. 305) 



26 (24) Breadth of oral fossa only 1-5 to 1-7 times the malar space ; the latter nearly or 



quite two thirds the length of an eye. Clypeus only about 1 -6 times as broad 

 as long, alutaceous except sometimes its anterior edge. Speculum, on 

 upperside of wing, open below except sometimes at apex. Eyes almost 

 circular ........ longigena sp. n. (p. 306) 



- Breadth of oral fossa i-8 to 2-5 times the malar space ; the latter from 



slightly less than half, to slightly more than half, the length of an eye. 

 Clypeus nearly or quite twice as broad as long, sometimes partly to almost 

 entirely smooth. Speculum closed or nearly closed below . . . 27 



27 (26) Head in dorsal view (Text-fig. 237) more transverse, 2-1 to 2-3 times as broad as 



its maximum length ; eyes separated by 1 -3 to 1 -55 times their own length ; 

 temples converging fairly strongly. Malar space half the length of an eye or 

 slightly more. Antennal clava usually slightly shorter than the combined 

 length of the three preceding funicular segments. Scutellum with 10 to 24 

 bristles. Larger species, 2-0 to 3-1 mm. . . . salicis (Nees) (p. 303) 



- Head in dorsal view (Text-figs. 236, 238) less transverse, i-8 to 2 times as 



broad as its maximum length ; eyes usually separated by 1 -15 to 1 -25 times 

 their own length, if by rather more, then head of characteristic shape (Text- 

 fig. 236). Malar space usually slightly less than half the length of an eye. 

 Antennal clava as long as the combined length of the three or four preceding 

 funicular segments. Scutellum with 6 to 10 bristles. Smaller species, i-6 

 to 2-3 mm. ........... 28 



28 (27) Head in dorsal view (Text-fig. 236) with temples hardly narrowed behind eyes 



coactus sp. n. (p. 307) 



- Head in dorsal view (Text-fig. 238) with temples more or less narrowed behind 



eyes ............. 29 



