512 M. W. R. de V. GRAHAM 



77 (76) Malar space virtually, or fully, half the length of an eye 



Propodeum, text-fig. 387 . . . . H. altus (Walker) (p. 537) 



- Malar space slightly less than half the length of an eye. (Slovakia) 



H. sp. indet. G (p. 538) 



78 (74) Fore wing (Text-fig. 404) with parastigma notably thickened, its breadth 



about equal to the greatest breadth of the marginal vein ; marginal vein 

 i-6 to 1-7 times as long as the stigmal vein. Antennal scape reaching only 

 to about middle of median ocellus 



Propodeum, Text-fig. 388 ; head, Text-fig. 415 



H. crassinervis Thomson (p. 537) 



- Fore wing with parastigma not notably thickened ; marginal vein sometimes 



shorter relative to the stigmal vein. Antennal scape sometimes reaching 



level of vertex ........... 79 



79 (78) Antennae with scape much shorter than an eye, reaching at most to level of 



middle of median ocellus ; combined length of pedicellus and flagellum at 



least slightly less than breadth of head ....... 80 



- Antennae with scape nearly as long as an eye, reaching to level of vertex or 



even above it ; combined length of pedicellus and flagellum most often 

 equal to, occasionally slightly less than, the breadth of the head ... 84 



80 (79) Scutellum in profile appearing weakly convex or virtually flat. Marginal vein 



only 1-15 to 1-35 times as long as the stigmal vein. Mandibular formula 4.4. 



Body dark bluish or bluish bronze . . .P. venustus Walker (p. 491) 



Scutellum in profile appearing moderately to strongly convex. Marginal vein 

 1-3 to 1-7 times as long as the stigmal vein. Mandibular formula almost 

 always 3.4 (4.4 only in rare aberrations) . . . . . . 81 



81 (80) Genae much compressed, though not sharp-edged ; temples posteriorly 



appearing angulate, much as in $, cf. Text-fig. 419, and converging only 

 slightly. Head and thorax bronze- or olive-green. Propodeum (Text-fig. 

 375) with nucha with areoles lengthened in the transverse axis ; posterior 

 part of plicae extending only a little way on to sides of nucha. POL not or 

 hardly greater than OOL . . . . . H. cioni Thomson (p. 526) 



- Genae at most slightly compressed ; temples usually less angulate and converg- 



ing more distinctly, but if approaching the shape seen in cioni then head and 

 thorax green to blue-green and nucha with more isodiametric areoles. 

 Propodeal plicae usually extending farther along sides of nucha. POL 

 slightly greater than OOL . . . . . . . . .82 



82 (81) Propodeum medially half or slightly less than half as long as scutellum ; med- 



ian area i-6 to 1-7 times as broad as long. Head in dorsal view (Text-fig. 

 413) 2-2 to 2-3 times as broad as long. Marginal vein 1-3 to 1-55 times as 

 long as the stigmal vein. Head and thorax, and gaster mainly, bronze 



H. isarchus (Walker) (p. 527) 



- Propodeum medially slightly more than half as long as scutellum ; median area 



1 -3 to 1 -5 times as broad as long. Head in dorsal view 2 to 2-15 times as 

 broad as long. Marginal vein 1-5 to 1-7 times as long as the stigmal vein. 

 Head and thorax, and gaster mainly, dull to bright green or blue . 83 



83 (82) Head in dorsal view with temples fully, or even slightly more than, one third as 



long as the eyes. Upper triangular area of mesepisternum polished and 

 smooth. All femora, at least proximally, infuscate or black. Flagellum 

 brown or subtestaceous .... H. hieracii Thomson (p. 536) 



- Head in dorsal view with temples hardly one third as long as eyes. Upper 



triangular area of mesepisternum having its dorsal part delicately aluta- 

 ceous. Femora reddish, or slightly infuscate proximally. Flagellum 

 blackish ..... Sceptrothelys parviclava sp. n. (p. 487) 



