5 o8 M. W. R. de V. GRAHAM 



48 (47) Head in dorsal view (Text-fig. 412) 2-17 to 2-33 times as broad as long. Host 



on Centaurea scabiosa . . . . . H. ochrocerus Thomson (p. 526) 



Head in dorsal view 2-1 to 2-15 times as broad as long. Host on Papaver 



H. ? papaveris (Forster) (p. 526) 



49 (14) The striations of the clypeus extend well up the genae, nearly to the lower 



corners of the eyes, and as far as the malar sulcus. Costal cell of fore wing 

 with upper surface with a row of short hairs in the distal half, lower surface 

 with two or three complete lines of hairs. Antennae with all funicular 

 segments, except sometimes the first, slightly transverse ; scape not reach- 

 ing the median ocellus. Hypopygium extending at least slightly more than 

 half way along the gaster. Propodeum, medially, more than half as long as 

 the scutellum, with a large reticulate nucha ...... 93 



The striations of the clypeus extend at most slightly up the genae. Costal 

 cell of fore wing with upper surface bare or with at most one or two hairs 

 distally, lower surface usually with only one complete line, rarely two 

 complete lines, of hairs. Antennae sometimes otherwise. Hypopygium 

 extending at most about half way along the gaster. Propodeum often 

 relatively shorter, or with a poorly-developed nucha . . . . 52 



50 (10) Gaster 2-5 to 3-2 times as long as broad, average about three times ; last 



tergite 1-5 to 2 times as long as its basal breadth 



H. vibulenus (Walker) (p. 525) 

 Gaster 2-3 to 2-5 times as long as broad ; last tergite from hardly as long, to 



1 '3 times as long, as its basal breadth . . . . . . .51 



51 (50) Mesoscutum and scutellum more glittering. Propodeum (Text-fig. 382) with 



costula absent, or sharp only at the sides of the median area 



H. chlorospilus (Walker) (p. 524) 

 Mesoscutum and scutellum rather dull. Propodeum with costula complete and 



sharp ........ H. sp. indet. A (p. 525) 



52 (49) Propodeum (Text-fig. 378) with a strong costula ; panels of median area 



irregularly sculptured, with some wrinkles or longitudinal carinulae. Pro- 

 notal collar long, medially nearly or quite one fifth as long as mesoscutum. 

 Marginal vein of fore wing 1-35 to 1-4 times as long as the stigmal vein. 

 Gaster lanceolate, 2-5 to 2-7 times as long as broad, slightly longer than 

 head plus thorax ; last tergite longer than its basal breadth. Head and 

 thorax bright to dark blue or greenish blue . H. berylli (Walker) (p. 544) 



- Propodeum (Text-figs. 375, 383-389) nearly always without a costula, but if 



one is at all distinctly indicated then the panels of the median area are nearly 

 uniformly reticulate, or the pronotal collar is relatively shorter, or the 

 marginal vein is at least 1 -5 times as long as the stigmal vein 53 



53 (5 2 ) Fore wing with distal quarter to one third of basal cell pilose ; marginal vein 



about i-6 times as long as the stigmal vein. Gaster slightly longer than 

 head plus thorax. Pronotal collar short medially, only about one ninth as 

 long as mesoscutum. (Sweden : on Picea) . . . H. sp. indet. B (p. 531) 



Basal cell of fore wing with at most one to three isolated hairs, not counting 



any hairs which may be present on the basal vein ..... 54 



54 (53) Gaster usually obviously longer than head plus thorax, only slightly longer in 



some aberrant specimens. Fore wing with speculum, on upper surface of 

 wing, extending only about as far as the beginning of the marginal vein, the 

 latter only 1-15 to 1 -35 times as long as the stigmal vein ; postmarginal vein 

 distinctly longer than the marginal vein ; disc of wing beyond the speculum 

 densely pilose, with fuscous hairs . . . H. bedeguaris Thomson (p. 527) 



If the gaster is longer than head plus thorax, then the speculum of the fore wing 

 extends beneath at least the proximal half of the marginal vein ; in most 



