4 oo M. W. R. de V. GRAHAM 



- Mesoscutum without evident piliferous punctures ; irons and face not 



rugulosely reticulate. Propodeum usually with some trace of a costula, 

 medially at least slightly more than one third as long as the scutellum . 93 



93 (92) Either the distal half or more of the basal cell of the fore wing is pilose ; or 



the median area of the propodeum has a strong costula and some irregular 

 wrinkles, but little fine reticulation . . . CAENACIS Forster (p. 569) 



- Basal cell of fore wing, not counting the basal vein, bare or nearly so ; 



median area of propodeum nearly uniformly reticulate, the costula weak 



DINOTOIDES Boucek (p. 571) 



94 (86) Postspiracular sclerite (Text-fig. 318) visible only as a small subequilateral 



triangle lying against the tegula ; pronotum (Text-fig. 317) as wide or 

 virtually as wide as the mesoscutum, the surface in front of the pronotal 

 collar descending vertically to the very short neck ; head and thorax most 

 often with whitish hairs . . . . . . . . 153 



- Postspiracular sclerite often large ; if narrow (Text-fig. 336) then visible as 



an elongate triangle which descends well ventrad, and the pronotum (Text- 

 figs. 316, 333) at least slightly less wide than the mesoscutum ; head, 

 mesoscutum, and scutellum usually with at least most of their hairs dark . 95 



95 (94) External edge of hind tibia (Text-fig. 322) with several short spines in addition 



to the ordinary hairs ; fore femur more or less swollen ; clypeus mainly 

 reticulate ; fore wing usually with two fuscous clouds, one below the 

 parastigma, the other around the stigmal vein 



CHEIROPACHUS Westwood (p. 416) 



- External edge of hind tibia without spines. Fore femur usually not 



swollen. Clypeus usually striate. Fore wing usually immaculate, occa- 

 sionally with a fuscous cloud below the marginal vein, rarely with a cloud 

 around the stigmal vein ......... 96 



96 (95) Face below level of antennal toruli, and clypeus, with several conspicuous 



piliferous punctures ; the clypeus otherwise mainly reticulate. Pronotal 

 collar not margined. 



Propodeal nucha represented only by a narrow, weakly-sculptured 

 transverse strip, or a ridge . . . ROPTROCERUS Ratzeburg (p. 423) 



- Face and clypeus nearly always without piliferous punctures ; if with a few, 



then either the clypeus is mainly striate, or the pronotal collar is margined 97 



97 (96) Clypeus (Text-fig. 572) abnormal, bent under anteriorly, its front margin 



angularly produced ; in a frontal view of the head, the anterior edge of the 

 clypeus appears to lie at least slightly farther dorsad than the lower edge of 

 the genae. 



Propodeum with a distinct, reticulate nucha. Pronotal collar sharply 

 margined ROHATINA Bou6ek (p. 700) 



- Anterior part of clypeus not bent under, its front margin not angularly 



produced ; anterior edge of clypeus rarely lying farther dorsad than the 



lower edge of the genae ......... 98 



98 (97) Propodeum with a more or less developed costula ..... 99 



- Propodeum without a costula ........ 102 



99 (98) Propodeum medially half or more than half as long as the scutellum, and 



produced well beyond the bases of the hind coxae. Pronotal collar sharply 

 margined almost throughout ........ 100 



- Either the propodeum (medially) is less than half as long as the scutellum ; or 



the pronotal collar is at most margined in the middle . . . .102 



100 (99) Median area of propodeum shiny, its panels with some irregular wrinkles but 

 little or no fine reticulation ; costula not straight, usually irregular ; 



