154 M. W. R. de V. GRAHAM 



basal tergite of the gaster is excised medially. Postspiracular sclerite 

 without an oblique carina . . . . . . . . .27 



27 (26) Hind margin of basal tergite of gaster excised medially, sometimes also the 



hind margin of second and third tergites. Female gaster not or only slightly 

 longer than thorax, at most slightly more than twice as long as broad ; 

 antennal clava with micropilosity on third segment only 



XESTOMNASTER Delucchi (p. 232) 

 Hind margins of gastral tergites not excised. Female gaster as long as head 

 plus thorax, at least 2-5 times as long as broad ; antennal clava with 

 micropilosity on all the segments, or at least on the second and third 



THEKTOGASTER Delucchi (p. 207) 



28 (25) Scutellar frenum marked off by a strongly impressed line, and with some 



longitudinal costulae, which are often strong, but most often with little or 

 no fine reticulation. Petiole of gaster usually distinctly, even if irregularly, 

 sculptured, often with a transverse crest anteriorly. Antennal funicle 

 usually with numerous short sensilla arranged in two to four rows on each 

 segment, rarely in only one irregular row ...... 29 



Scutellar frenum marked off by a finer line, relatively uniformly and finely 

 reticulate. Petiole of gaster most often nearly smooth ; without a trans- 

 verse crest. Antennal funicle of female often with fewer and longer 

 sensilla arranged in only one row on each segment ..... 30 



29 (28) Either the gastral petiole has strong rugulosity or irregular sculpture, usually 



with a transverse crest anteriorly ; or else the basal cell of the fore wing is 

 open below. Basal vein of fore wing distinctly pigmented, nearly or quite to 

 its junction with the parastigma (as in Text-fig. 124) ; speculum most often 

 open below. Scutellum with at least some trace of a longitudinal impressed 

 line at its base. Left mandible with three or four teeth, right mandible 



with four LAMPROTATUS Westwood (p. 233) 



Gastral petiole with at most some very fine reticulation, or transverse 

 aciculation, without a transverse crest anteriorly ; basal cell of fore wing 

 closed below in at least the distal half ; speculum closed below. Basal vein 

 usually less distinctly pigmented. Scutellum usually without an impressed 

 line at its base. Left mandible, or both mandibles, with three teeth . . 30 



30 (29) Females with gaster as long as head plus thorax ; antennal clava with micro- 



pilosity on second and third segments ; sensilla arranged in two or three rows 

 on all segments of the funicle ; left mandible with three teeth, right mandible 

 with four ; basal vein of fore wing pigmented nearly or quite throughout. 

 Males not accurately known . THEKTOGASTER Delucchi (p. 207) 



- Females with gaster rarely as long as head plus thorax, if so then antennal 



clava has micropilosity on its third segment only, the sensilla are arranged 

 in one row on at least the distal segments of the funicle, and the basal vein 

 is not pigmented throughout. Both mandibles with three teeth, 6* 9 • • 3 1 



31 (30) Anterior margin of clypeus (Text-fig. 127) with a median lobe or tubercle, 



and usually a smaller one on either side of it. Combined length of pedi- 

 cellus and flagellum in female less than, in male at most equal to, the breadth 



of the head NODISOPLATA gen.n. (p. 180) 



Anterior margin of clypeus either bidentate, or with three asymmetric teeth 

 (Text-fig. 128). Combined length of pedicellus and flagellum nearly always 

 at least slightly greater than breadth of head, only about equal to it in some 

 females ............ 32 



32 (31) Females with antennal flagellum very stout proximally, nearly twice as broad 



as the pedicellus in profile, but tapering a little distad ; scape only about 

 half as long as an eye ; funicle with numerous short sensilla arranged in 



