5 io M. W. R. de V. GRAHAM 



present. Gaster conical, clearly longer than head plus thorax. Basal 



vein of fore wing with about six hairs . . H. ? tereus (Walker) (p. 531) 



- Propodeum (Text-figs. 384, 385) with reticulation of nucha not coarser, and often 



finer, than that of the panels of the median area, with its areoles more or 

 less lengthened in the transverse axis ; costula absent. Basal vein of fore 

 wing sometimes bare or nearly so . . . . . . . .65 



65 (64) Gaster nearly to quite twice as long as the thorax, acuminate ; last tergite 



1 >7 to 2-5 times as long as its basal breadth. 



Pronotal collar very short medially, one ninth to one eighth as long as the 

 mesoscutum ........... 68 



- Gaster distinctly less than twice as long as the thorax, less acuminate, with last 



tergite relatively shorter ......... 66 



66 (65) Pronotal collar, medially, usually one seventh to one sixth as long as the 



mesoscutum ; if shorter then the gaster has well-defined purplish fasciae on 

 the middle tergites, the disc sometimes entirely purplish bronze. Body most 

 often dull or bronze- (occasionally bright) green ..... 67 



- Pronotal collar medially shorter, one ninth to one eighth as long as the meso- 



scutum. Gaster without, or with poorly-defined, purplish fasciae. Body 

 usually bright green to blue, sometimes brassy. Species associated with 

 sawfly galls on Salix .......... 69 



67 (66) Propodeum (Text-fig. 384) with median area only about 1 -5 times as broad as 



long ; the median length of the propodeum slightly more than half that of 

 the scutellum ; nucha occupying slightly more than one third the total 

 length of the propodeum ; plicae, on sides of nucha, hardly converging. 

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



H. grandis (Walker) (p. 528) 



- Propodeum (Text-fig. 385) with median area 1 -7 to 1 -8 times as broad as long ; 



the median length of the propodeum about half that of the scutellum ; 

 nucha occupying slightly more than one quarter the total length of the 

 propodeum ; plicae, on sides of nucha, converging somewhat. Marginal vein 

 of fore wing 1-35 to 1 -6 times as long as the stigmal vein 



H. semotus (Walker) (p. 529) 



68 (65) Gaster nearly to quite twice as long as the thorax, acuminate ; last tergite 



i-8 to 2-5 times as long as its basal breadth ; hypopygium extending one 

 third or slightly less than one third along the gaster. Median area of 

 propodeum only 1-5 to i-6 times as broad as long 



H. capreae (L.) Thomson (p. 533) 

 Gaster usually distinctly less than twice as long as the thorax ; if nearly twice 

 then the median area of the propodeum is nearly twice as broad as long. 

 Gaster with its last tergite 1-3 to i-8 times as long as basally broad ; 

 hypopygium extending somewhat more than one third along the gaster . 69 



69 (68) Gaster somewhat, to considerably, less than twice as long as the thorax ; last 



tergite 1-3 to i-6 times as long as its basal breadth. Median area of pro- 

 podeum 1-5 to 1-65 times as broad as long. Femora usually pale, rarely 

 all of them mainly dark . . . . H. dolichurus Thomson (p. 533) 



- Gaster nearly twice as long as thorax ; last tergite 1-7 to i-8 times as long 



as its basal breadth. Median area of propodeum 1 -8 to 2 times as broad as 



long. All femora mainly black . . . . . H. sp. indet. D (p. 533) 



70 (59) Pronotal collar sharply margined throughout, or except just at the sides. 



Propodeum much like that of altus (cf. Text-fig. 387), the nucha relatively 

 short and separated from the median area by a deep, longitudinally costate 

 constriction. Antennal scape reaching to or above the level of the vertex 71 



- Pronotal collar usually at most weakly margined in the middle ; but if at all 



