32 G. E. J. NIXON 



- Hind femur with infuscate cloud only on apical half, more extensive above ; tergite i 



markedly narrowed behind, almost wedge-shaped ; median field of tergite (2 + 3) 

 more transverse, more acutely angled laterally ; hind coxa in greater part polished, 

 shining. Africa ........ novatus sp. n. (fig. 57) 



32 Disc of scutellum superficially striate-punctate ; hairs of the median cell 



colourless. 



Wing glass-clear ; hind wing broad, the length of the 2nd abscissa of the mediella 

 clearly shorter than the distance between its distal extremity and the apex of the 

 vannal lobe as in syleptae (Text-fig. 18) ; hind coxa dull, with satin-like sheen. 

 Mauritius ......... faustina sp. n. (p. 58) 



- Disc of scutellum weakly punctate towards sides ; hairs of the median cell 



distinctly darkened . . . . . . . . . . -33 



33 Hind tibia pale only at extreme base ; hind tarsus not slender, the basitarsus 



somewhat wide with conspicuous ventral keel (Text-fig. 14) ; 1st abscissa of the dis- 

 coideus not at all shorter than the 2nd ; 2nd abscissa of the discoideus more 

 curved ; ovipositor sheath about one and a half times longer than the hind tibia. 

 Africa .......... isander sp. n. (p. 59) 



- Hind tibia less darkened, the paler basal suffusion extending almost halfway ; hind 



tarsus very slender, the basitarsus not at all widened and with quite inconspicuous 

 ventral keel ; 1st abscissa of the discoideus distinctly shorter than the 2nd ; 

 2nd abscissa of the discoideus less curved ; ovipositor sheath about one and a quar- 

 ter times longer than the hind tibia. 



Fore wing brownish ; hind wing rather narrow. Africa . raesus sp. n. (p. 59) 



34 Tergite 1 elongate, gradually narrowed from base to apex, hence wedge-shaped ; 



(Text-fig. 78) its horizontal part distinctly to considerably longer than wide ; claws 

 strongly developed, strongly curved (Text-fig. 77). 



Hind femur entirely or almost entirely yellow ; areolation of propodeum strong, 

 complete ............. 35 



- Tergite 1 rarely as long as this and then the claws are smaller and less well developed 37 



35 Mesoscutum shiny, with sharp punctation, but broadly along the middle the punc- 



tation is absent, leaving the surface more shiny and more polished. 



Disc of scutellum polished, impunctate. Philippines . vacillans sp. n. (p. 91) 



- Mesoscutum dull and with dense punctation that does not fade out along the middle 



line ............... 36 



36 Claws less well developed ; disc of scutellum virtually impunctate ; ovipositor 



sheath as long as the hind tibia. Philippines . . dissimile sp. n. (p. 93) 



- Claws more strongly developed (as in vacillans) ; disc of scutellum distinctly 



punctate, more conically raised behind than in dissimile ; ovipositor sheath fully 

 one and a quarter times longer than the hind tibia, appearing considerably 

 longer. Philippines ........ cestius sp. n. (p. 93) 



37 Median field of tergite (2 -f- 3) at most twice as wide as long. 



Stigma entirely dark .......... 38 



- Median field of tergite (2 + 3) always more transverse than this or, if not, then stigma 



pellucid ............. 40 



38 Disc of scutellum distinctly punctate or irregularly pitted, its posterior tip narrowed 



and with subtruncate posterior face ; hind femur yellow ; median field of tergite 



(2 + 3) about one and two thirds wider than long ; flagellum of ordinary form . 39 



- Disc of scutellum polished, posteriorly flattened and without a subtruncate, posterior 



face ; hind femur in greater part infuscate ; median field of tergite (2 + 3) about 

 one and one third times wider than long, polished ; antenna shorter than the body; 

 flagellum tapering towards apex, clothed with conspicuous, bristly pubescence. 

 Africa ........ chalcomelas sp. n. (p. 60) 



39 Hind coxa yellow ; median field of tergite (2 -f 3) very coarsely rugose ; disc of 



