5 04 M. W. R. de V. GRAHAM 



bright testaceous beneath. Head and thorax bright green to blue-green. 

 Head in dorsal view with temples nearly half as long as eyes 



H. parietinae sp. n. (p. 553) 



- Antennal flagellum less slender, proximally distinctly stouter than the pedicel- 



lus, fuscous or at most obscurely testaceous beneath. Head and thorax 

 sometimes bronze-green. Temples sometimes appearing shorter in dorsal 

 view of head ........... 28 



28 (27) Median area of propodeum (Text-fig. 374) 1-5 to i-6 times as broad as long ; 



propodeum, medially, about half as long as the scutellum. Head in dorsal 

 view with temples half or practically half as long as eyes. Head and thorax 

 a rather dull green to blue-green. 



Head, Text-fig. 411 . . . . H. glabriculus Thomson (p. 542) 



- Median area of propodeum 1-7 to 1-9 times as broad as long ; propodeum, 



medially, slightly less than half as long as the scutellum. Head in dorsal 

 view with temples somewhat less than half as long as eyes. Head and 

 thorax tending to be bronze-green . . . . H. sp. indet. H (p. 542) 



29 (26) Propodeum (Text-figs. 375, 381) without a costula ; panels of the median area 



uniformly or almost uniformly reticulate or strigose-reticulate ... 30 



- Propodeum (Text-figs. 376-380) with a costula ; panels of the median area often 



irregularly sculptured . . . . . . . . . -35 



30 (29) POL hardly greater than OOL. Propodeum (Text-fig. 375) half as long as the 



scutellum ; posterior part of the plicae not reaching the hind edge of the 

 nucha, somewhat convergent . . . H. cioni Thomson (p. 526) 



- POL distinctly greater than OOL except in a few species, which have the 



posterior part of the plicae extending to the hind edge of the nucha, and the 

 propodeum itself less than half as long as the scutellum . . . . 31 



31 (30) Antennae with proximal segments of funicle subquadrate, distal segments 



slightly transverse ; scape reaching at most to level of lower edge of median 

 ocellus ............ 32 



- Antennae with proximal segments of funicle distinctly longer than broad, 



distal segments usually not transverse ; scape sometimes reaching level 



with middle or top of median ocellus . . . . . . . 33 



32 (31) Antennae with flagellum stout, proximally very distinctly stouter than the 



pedicellus when the latter is seen in dorsal view, cylindrical or only weakly 

 clavate ; sensilla numerous, usually in two rows, rarely one row, on each 

 funicular segment. Head in dorsal view (Text-fig. 412) with temples one 

 third as long as eyes or slightly more, not converging very strongly . . 46 



- Antennae with flagellum slightly to very distinctly clavate, proximally not or 



hardly stouter than the pedicellus when the latter is seen in dorsal view ; 

 sensilla in one, sometimes slightly irregular, row on each funicular segment. 

 Head in dorsal view with temples one quarter as long as eyes or slightly more 33 



33 (32) Propodeum, medially, virtually half as long as the scutellum ... 34 



- Propodeum, medially, at most slightly more than one third as long as the 



scutellum ............ 35 



34 (33) Gaster about as long as, or slightly longer than, head plus thorax. Either the 



pronotal collar medially is only about one eighth as long as the mesoscutum ; 



or its front edge is somewhat obtuse ....... 78 



Gaster distinctly shorter than head plus thorax. Pronotal collar one sixth 

 to one fifth as long as the mesoscutum, its front edge abrupt, the dorsal 

 surface of the collar forming about a right angle with the pronotal neck, and 

 sometimes slightly margined ........ 35 



35 (34) Gaster at least slightly shorter than head plus thorax, 1-2 to 1-9 times as long 



as broad ............ 36 



