REVISION OF LEUCOSPIDAE 35 



- First tergite in both sexes black but epipygium in $ with yellow streaks; sides of 



thorax mostly black, pronotum posteriorly with narrow yellow band reduced at 

 sides; hind femur apart from upper pale line mainly black but often reddish 

 brown above teeth and at base; puncturation on disc of gaster dense, interspaces 

 usually narrow, fourth tergite in $ with punctures medially in about 6 cross-rows; 

 hairs on black part of pronotum black and on anterior part of gaster brown; 

 wings brownish; in <$ apex of gaster laterad of median depression broadly yellow, 

 scapus black ........ rileyi Schletterer (p. 40) 



4 Lower tooth of mandibles long, separated from upper edge by a broad semicircular 



gap (Text-figs no, 111, 116, 119; visible even when mandibles closed) ; propodeum 

 often unusually densely pilose, body often with vivid metallic tinge; pronotum 

 without premarginal cross-carina ......... 5 



- Lower tooth of mandibles mostly short and broad, always separated from the upper 



edge by a triangular excision (Text-figs 53, 73, 81) which is usually shallow (excep- 

 tion: L. bulbiventris, Text-fig. 42) ; propodeum mostly not very densely pubescent 

 (exception: stimichrastii (Text-figs 100, 101)); body with or without metallic 

 tinge ; premarginal carina of pronotum present or absent . . . . 11 



5 Upper part of depression of hind coxa with broad smooth area which extends to 



base and upper edge (Text-fig. 106); ovipositor long; dorsellum not carinate . 6 



- Hind coxa punctured in depression, or, if partly smooth, the impunctate area not 



reaching base of coxa; ovipositor often short; dorsellum posteriorly more or less 

 carinate ............. 7 



6 Apex of gaster brown-golden, with unusually thick long pilosity; smooth area of 



hind coxa confined to upper half of depression; dorsellum weakly convex; hind 

 femur near ventral edge rather densely punctured . . mexicana Walker (p. 93) 



- Apex of gaster dark, obscure metallic, with mainly greyish pilosity which is not 



thicker than elsewhere on gaster; smooth area of hind coxa extending over two- 

 thirds of depression; dorsellum short but strongly convex; hind femur beneath 

 coarsely and sparsely punctate (Text-fig. 107). . cayennensis Wcstwood (p. 92) 



7 Dorsellum flat, thickly covered with rather adpressed white pubescence; hind tibia 



(Text-fig. 113) mainly whitish, externally smooth, sparsely beset with coarse 

 punctures; ovipositor reaching middle of first tergite; posterior tergites dark 

 metallic ($) ........ metatibialis sp. n. (p. 97) 



- Dorsellum bare or with a few inconspicuous hairs, often not flat; hind tibia either not 



whitish or with dense puncturation externally; ovipositor shorter than above (in 

 species where 9 known) .......... 8 



8 Hind femur unusually slender (Text-fig. 112), together with hind tibia externally 



coarsely punctured; malar space virtually as long as scapus (Text-fig. in); 

 depression of hind coxa with distinct impunctate (but finely reticulate) area; 

 first tergite in both sexes virtually as broad as rest of gaster genalis sp. n. (p. 94) 



- Hind femur broader (cf. Text-fig. 118), puncturation of femur and tibia not coarse; 



malar space distinctly shorter than scapus (Text-fig. 116); hind coxa punctured 

 in depression, sometimes with small smooth space which is not well delimited; 

 first tergite often narrow .......... 9 



9 Propodeum in both sexes with very dense silvery pubescence covering the flat 



finely punctured surface; in $ ovipositor not reaching base of fifth tergite, in <$ 

 first tergite broader than long but only about o-6 as broad as gaster posteriorly 



ignota Walker (p. 99) 



- Propodeum not very densely hairy, its surface very uneven, coarsely punctured and 



at least anteriorly with some coarse rugae ; § unknown, in <§ gaster otherwise . . 10 



10 First tergite in <J elongate, less than half as broad as gaster posteriorly which has no 

 unusual pubescence (Text-fig. 114); indicated hind margins of tergites straight; 

 sixth tergite without median keel, spiracles minute . clavigastersp. n. (p. 100) 



- First tergite in ^ strongly transverse, only slightly narrower (0-75) than gaster 



