5 i6 M. W. R. de V. GRAHAM 



- Base of mandible in most species separated from gena by only a narrow lunate 



membranous area ; if this area is large and semicircular, then the breadth 

 of the oral fossa is only about twice the malar space, POL is greater than 

 OOL, and the ocelli are relatively larger ....... 7 



6 (5) Breadth of oral fossa 4 to 4-3 times the malar space. Mandibular formula 3.4. 



Eyes small, separated by about 1 -8 times their length. Propodeum less than 

 half as long as the scutellum ; plicae converging fairly strongly at sides of 

 nucha, the latter a narrow transversely-aciculate strip. Antenna with scape 

 not reaching above vertex ; funicular segments subquadrate 



H. microps sp. n. (p. 556) 

 Breadth of oral fossa 2-5 to 3 times the malar space. Mandibular formula 4.4. 

 Eyes separated by 1 -5 to 1 -6 times their length. Propodeum somewhat more 

 than half as long as the scutellum ; plicae subparallel posteriorly, on sides 

 of nucha ; nucha partly reticulate. Antenna with scape reaching slightly 

 above the vertex ; funicular segments tending to be slightly longer than 

 broad ........ P. procerus sp. n. (p. 492) 



7 (5) Anterior margin of clypeus (Text-fig. 393) incised medially .... 8 



Anterior margin of clypeus at most moderately emarginate, sometimes trun- 

 cate, medially (Text-figs. 394, 395) ....... 10 



8 (7) Propodeal spiracles small and subcircular. Fore wing with postmarginal vein 



longer than the marginal vein. Pronotal collar medially very short, its 

 front edge sharply margined. [No species as yet known, but the male of 

 janssoni sp. n. might be expected to have these characters] 

 Propodeal spiracles large, long-oval or sublinear. Fore wing with post- 

 marginal vein at most as long as the marginal vein. Pronotal collar 

 relatively longer medially, its front edge usually not sharply margined . 9 



9 (8) Pronotal collar, medially, from one-sixth, to nearly one-fifth, as long as the 



mesoscutum ...... H. sequester (Walker) (p. 554) 



- Pronotal collar, medially rather shorter than in the above 



H. ? cionobius (Erdos) (p 555) 



10 (7) Gena, near base of mandible, so strongly compressed that it forms a sharp edge 



Strigose sculpture of clypeus extending up the sides of the face to near the 

 eyes. Pronotal collar, medially, long, about one fifth as long as the meso- 

 scutum, its front margin raised and almost reflexed. Propodeum more than 

 half as long as the scutellum, with a fairly large nucha, uniformly reticulate, 

 without a costula. Antenna with combined length of pedicellus and 

 flagellum slightly greater than breadth of head H. chrysos (Walker) (p. 527) 



Gena, although sometimes moderately compressed, always rounded even 

 near the base of the mandible. Strigose sculpture usually extending less 

 far up the face. The other characters usually not all agreeing with the above 1 1 



11 (10) Anterior margin of clypeus (Text-fig. 395) truncate or even slightly curved 



forwards, without an impression in the middle . . . . . 12 



- Anterior margin of clypeus (Text-fig. 394) at least shghtly emarginate medi- 



ally, very often with an impression just above the emargination . . 14 



12 (11) Antenna with scape reaching the vertex, its length slightly greater than the 



transverse diameter of an eye ; combined length of pedicellus and flagellum 

 slightly greater than breadth of head ; all funicular segments, except some- 

 times the sixth, longer than broad. (Czechoslovakia) . H. sp. indet. E (p. 538) 



- Antenna with scape not reaching the vertex, its length barely or just equal to 



the transverse diameter of an eye ; combined length of pedicellus and 

 flagellum approximately equal to breadth of head ; at most segments one 

 to three of funicle slightly longer than broad, the distal segments quadrate 

 (or the sixth very slightly transverse) . . . . . . . 13 



