278 M. W. R. de V. GRAHAM 



19 (17) Scutello-axillar sutures (Text-figs. 202, 204) converging strongly so as to meet 



the hind margin of the mesoscutum well mesad of the notauli, sometimes 

 curving round and meeting, in which case the scutellum is separated from 

 the mesoscutum by a deep, often more or less punctate, groove. Propodeum 

 of female usually as long as or longer than the scutellar frenum . . 20 



- Scutello-axillar sutures (Text-figs. 253, 255) converging less strongly, so as to 



meet the hind margin of the mesoscutum only slightly mesad of the notauli. 

 Propodeum of female often relatively shorter, sometimes extremely short . 31 



20 (19) Postmarginal vein of fore wing (Text-fig. 228) nearly or quite as long as the 



marginal vein ; lower part of speculum, on underside of wing, more or less 

 effaced by scattered hairs or hair-bases ; on the upperside of the wing the 

 speculum is closed below ; distal two thirds or more of the basal cell pilose. 

 Female propodeum broadly emarginate posteriorly, medially shorter than the 

 scutellar frenum ; callus with at most four bristles ; fiagellum very short, 

 strongly clavate, with all funicular segments transverse acutus Walker (p. 295) 



- Postmarginal vein of fore wing (Text-figs. 230-233) slightly to very distinctly 



shorter than the marginal vein ; if only slightly so, then the speculum, on 

 upperside of wing, is more or less open below and at most the distal 

 quarter of the basal cell is pilose. Propodeum of female not broadly emar- 

 ginate posteriorly, medially as long as or longer than the frenum ; callus 

 nearly always with more numerous bristles, often quite thickly clothed with 

 them ............. 21 



21 (20) Mesepimeron (Text-fig. 207) broad, as strongly reticulate as the metapleuron 



and relatively dull ; at least the lower angle of the triangular area of the 

 mesepisternum reticulate. Mesoscutum (Text-fig. 204) with notauli rela- 

 tively shallow ; mesoscutum, axillae, and scutellum relatively dull, with very 

 fine dense sculpture and very weak short bristles, the piliferous punctures 

 extremely small and hardly visible. Prosternum strongly reticulate and 

 relatively dull. Propodeum of female medially somewhat more than one 

 third as long as scutellum, finely densely reticulate and dull 



vernalis sp. n. (p. 300) 



- Mesepimeron (Text-fig. 206) more elongate, more weakly reticulate, and more 



or less shiny ; upper triangular area of mesepisternum wholly smooth. 

 Mesoscutum (Text-fig. 202) with notauli deep ; mesoscutum, axillae, and 

 scutellum with longer and stronger bristles ; at least the mesoscutum has 

 distinct piliferous punctures, or small tubercles. Prosternum less strongly 

 sculptured, more or less shiny ........ 22 



22 (21) Base of scutellum separated from the mesoscutum by a deep and broad groove 



(Text-fig. 202) ; the surfaces of both the mesoscutum and the scutellum dip 

 more or less towards this groove. Fore wing (Text-figs. 230-233) : marginal 

 vein 2-2 to 3 times as long as the stigmal vein ; postmarginal vein distinctly 

 shorter than the marginal vein ; basal cell with scattered hairs over its 

 distal half to two thirds, except in clavatus, which has a large stigma, few 

 hairs on the propodeal callus, and none above the supracoxal flange. 

 Mesoscutum, except in clavatus, tending to have its reticulation more or less 

 raised above the general surface, and often more or less strigose transversely 

 in front ............ 23 



- Base of scutellum separated from mesoscutum by a relatively shallow, and not 



always very broad, groove ; in profile the surfaces of the two sclerites 

 therefore form an almost straight line. Fore wing with marginal vein 

 1 -8 to 2-1 times as long as the stigmal vein ; postmarginal vein usually only 

 slightly shorter than the marginal vein ; basal cell bare or with scattered 

 hairs over at most its distal quarter ; stigma (Text-figs. 249, 250) small or 



