3 o G. E. J. NIXON 



22 Ocelli in a higher triangle, the distance between the posterior pair slightly less than 



twice the diameter of the median ocellus ; hind femur bright yellow on about basal 

 quarter ; tergite (2 + 3) yellow, apart from the median field which is darker ; 

 stigma dark throughout. Philippines ..... niceppe sp. n. (p. 45) 



- Ocelli in a lower triangle, the distance between the posterior pair being fully twice the 



diameter of the median ocellus ; hind femur infuscate right to base ; tergite 

 (2 + 3) infuscate virtually all over ; stigma with pale basal spot, not very distinct. 

 Indo-oriental region ...... signiflcans Walker (p. 45) 



23 Hind femur entirely bright reddish yellow. 



Hairs of the ovipositor sheath short, not upstanding ..... 24 



- Hind femur infuscate at least on apical half ....... 26 



24 Hind tarsus infuscate, except the basitarsus which is sharply pale at base ; segment 4 



of the hind tarsus, measured below, hardly shorter than 5. 



Ovipositor sheath about as long as the hind tibia. Indo-oriental region 



diodes sp. n. (p. 48) 



- Hind tarsus yellowish, with at most the apex of the hind basitarsus infuscate ; 



segment 4 of the hind tarsus, thus measured, distinctly shorter than 5. 



Horizontal surface of tergite 1 with broad, more or less smooth, medial trough . 25 



25 Tergite 1 markedly narrowed behind ; ovipositor sheath hardly longer than the hind 



tibia ; sculpture of the mesopleurum consisting of coarse rugosity ; frons and 

 vertex with much coarse sculpture . Philippines . . . dores sp. n. (p. 49) 



- Tergite 1 virtually not narrowed behind ; ovipositor sheath fully one and one third 



times longer than the hind tibia ; sculpture of mesopleurum becoming simple 

 punctation posteriorly ; at least the space between the posterior ocellus and the 

 eye-margin almost smooth and polished. Indo-oriental region 



salutifer Wilkinson (p. 48) 



26 Disc of scutellum dull, closely reticulate-punctate, without any indication of 



striation, its sculpture exactly like that of the posterior part of the mesoscutum ; 

 very narrow behind and here almost conically raised. 



Ovipositor sheath hardly as long as the hind tibia. Africa . antilla sp. n. (p. 54) 



- Disc of the scutellum shiny, feebly punctate or vaguely striate-punctate and its 



appearance, on the whole, in sharp contrast with the sculpture of the posterior part 



of the mesoscutum ........... 27 



27 Ovipositor sheath not or hardly longer than the hind tibia . . . . . 28 



- Ovipositor sheath distinctly longer than the hind tibia ..... 30 



28 Tergite 1 dull, coarsely, evenly reticulate-rugose ; median field of tergite (2 + 3) 



equally rugose ; abscissa 1 of the radius very obliquely placed on the stigma (Text- 

 fig. 21). Africa ........ abdera sp. n. (p. 50) 



- Tergite 1 much more weakly sculptured, shiny and with a more or less clearly defined, 



longitudinal smooth trough on its horizontal part ; abscissa 1 of the radius placed 



at right angles to the stigma . . . . . . . . .29 



29 Length about 3 mm. without ovipositor ; wings clear hyaline ; hind wing markedly 



broad (Text-fig. 18). Africa ..... syleptae Ferriere (p. 59) 



- Length about 2 mm. without ovipositor ; wings faintly brownish ; hind wing 



decidedly narrow. Philippines ..... coedicius sp. n. (p. 46) 



30 Hind tibia yellow on basal half and more or less in sharp contrast with the infuscate 



apical part ; hind trochanters yellow. 



Disc of scutellum polished and with hardly a trace of punctation ; ovipositor 

 sheath hardly one and a quarter times longer than the hind tibia . . . 31 



- Hind tibia less sharply yellow on basal half or clearly paler only at extreme base ; 



hind trochanters dark . . . . . . . . . .32 



31 Hind femur infuscate throughout ; tergite 1 narrow but parallel-sided ; median 



