152 M. W. R. de V. GRAHAM 



transverse ridge anteriorly. Other characters as in Lamprotatus (see 

 below) except that stigma of fore wing is sometimes large 



SKELOCERAS Delucchi (p. 241) 



— Antennal formula 11263, the three claval segments closely approximated, 



separated by at most shallow constrictions ...... 20 



20 (19) Fore wing with speculum, at least on upper surface of wing, moderately broad 



and extending to the basal vein ; basal cell sometimes mainly bare . . 21 



— Fore wing with speculum either absent, or represented only by a narrow bare 



line outside the basal vein, or reduced to a small oval patch which lies 

 below the parastigma but does not reach the basal vein ; basal cell mainly 

 or wholly pilose ........... 26 



21 (20) Lower edge of mandible (Text-fig. 123) rather deeply excised ; stigma of 



fore wing rather large, subcircular (as in Text-fig. 164) ; gastral petiole as 

 long as or longer than broad, reticulate. 



Anterior margin of clypeus (Text-fig. 170) bidentate 



GLYPHOGNATHUS Graham (p. 208) 



— Lower edge of mandible usually at most weakly sinuate, if excised (Seladerma 



scaea, Text-fig. 147) then the stigma of the fore wing is smaller and more 



oval, whilst the gastral petiole is slightly transverse and nearly smooth . 22 



22 (21) Petiole of gaster as long as or longer than the median length of the propodeum ; 



usually longer than (occasionally only as long as) broad . . . . 23 



— Petiole of gaster at least slightly shorter than the propodeum, rarely longer 



than broad and often more or less transverse . . . . . . 25 



23 (22) Basal tergite of gaster (Text-fig. 122) slightly emarginate in the middle of its 



hind margin ........... 24 



— Hind margin of basal tergite of gaster entire . . . . . . 25 



24 (23) Basal vein of fore wing (Text-fig. 124) very distinct, pigmented throughout 



from the level of the bottom of the speculum to its junction with the 

 parastigma ; costal cell of hind wing nearly always with some hairs basad of 

 the level of the basal cross-vein (as in Text-fig. 125) ; scutellar frenum most 

 often relatively shiny and with some longitudinal costulae, rarely almost 

 uniformly reticulate ; both mandibles with four teeth 



MISCOGASTER Walker (p. 226) 



— Basal vein of fore wing distinctly coloured only in about its lower half ; costal 



cell of hind wing bare as far as the level of the basal cross-vein (Text-fig. 

 126) ; scutellar frenum uniformly reticulate ; left mandible, or both 

 mandibles, with three teeth ......... 25 



25 (24) Stigma of fore wing (Text-fig. 164) relatively large, separated by less than 



twice its height from the costal edge of the wing. Either the gastral petiole 

 is finely and relatively uniformly reticulate ; or else the petiole is at least 

 slightly longer than broad and the scutellar frenum is uniformly reticulate. 

 Notauli sometimes superficial posteriorly GITOGNATHUS Thomson (p. 209) 



— Stigma of fore wing (Text-figs. 152-155, 158) smaller, separated by at least 



twice its height from the costal edge of the wing. Gastral petiole not 

 longer than broad and most often transverse, usually smooth or weakly and 

 irregularly sculptured ; if uniformly reticulate then the scutellar frenum has 

 some longitudinal costulae. Notauli sharply impressed throughout . . 28 



26 (20) Petiole of gaster reticulate, at most slightly transverse and usually as long as or 



longer than broad ; stigma of fore wing large or moderately large ; hind 

 margins of gastral tergites not excised medially ; postspiracular sclerite 

 most often with an oblique carina . . STICTOMISCHUS Thomson (p. 216) 



— Either the gastral petiole is virtually smooth, and obviously transverse ; or 



the stigma of the fore wing is smaller ; or the hind margin of at least the 



