16 D. S. FLETCHER 



— Aedeagus scobinate or smooth, but without tapered projection. Ventral plate 



of gnathus well developed. Dorsal process of valve not so formed . . 9 



9 (8) Dorsal process of each valve with serrate edge or with serrate-edged projection, 

 the two processes symmetrical or asymmetrical (Text-figs 47, 61); or with 

 triangular or spatulate projection at about three-fourths (Text-figs 63, 71). 

 Ventral plate of gnathus produced ventrad, tongue-like in shape, rounded 

 at tip. Aedeagus coarsely scobinate at one side in apical fourth (except 

 ochrata) . Fulcrum scobinate at tip, longer than aedeagus (except melasma) ; 

 vesica always with one thorn-like cornutus . pulverosa-group (part) (p. 40) 



— Dorsal process with spine-like (Text-fig. 21) or with smooth-, never serrate- 



edged, angular projection (Text-fig. 35) at about three-fourths. Ventral plate 

 of gnathus sclerotized and well developed, but not produced ventrad in 

 tongue-like form. Aedeagus smooth, or with one surface scobinate; cornuti 

 always multiple, consisting of a cluster of short spines equal in length to 

 width of aedeagus ..... mimimaria-group (part) (p. 26) 



10 (6) Fulcrum bifid, the twin parallel arms blade-like, symmetrical or asymmetrical; 



or tapered to points and asymmetrical . . . . . . . 11 



— Fulcrum not so formed .......... 13 



11 (10) Arms of fulcrum tapered to points and asymmetrical. Tenth sternite and 



tergite spirally twisted so that uncus is situate ventrally and ventral plate 



of gnathus situate dorsally ..... acosmeta-group (p. 193) 



— Arms of fulcrum blade-like ......... 12 



12 (11) Arms of fulcrum symmetrical, ventral margin of each serrate in basal two- 



thirds. Inner surface of each valve with inwardly-pointing, peg-like 

 projection at apex ....... paxilla-gxonp (p. 254) 



— Ventral margin of each arm of fulcrum smooth. Valve simple vu/pina-group (p. 150) 



13 (10) Uncus hood-like or bilobate with a pair of pointed processes, symmetrical or 



asymmetrical, extending from dorsal surface. Valves symmetrical or 

 asymmetrical. Oriental region .... eogenaria-group (p. 70) 



— Uncus not so formed and never with processes extending from dorsal surface . 14 



14 (13) Uncus cowl-like with minute, tapered projection from mid-apical margin. 



Aedeagus scobinate or serrate on one lateral surface. Fulcrum very weakly 

 developed. Vesica with one or more cornuti. Oriental region 



scriptifasciata-group (p. 64) 



— Uncus not so formed .......... 15 



15 (14) Valves symmetrical ........... 16 



— Valves asymmetrical .......... 18 



16 (15) Uncus bilobate or shallowly and narrowly excavate at apex . . . . 17 



— Uncus not so formed .......... 27 



17 (16) Uncus broadly and asymmetrically bilobate. Ventral plate of gnathus 



asymmetrical. Dorsal and ventral margins of each valve slenderly produced, 

 dorsal extension simple and straight, ventral extension scobinate and finely 

 tapered (Text-fig. 445) . . . euc harts-group (part, mimesis) (p. 259) 



— Uncus tapered to shallowly and narrowly excavate apex, ventrad of which 



projects a blunt, rectangular process. Ventral plate of gnathus symmetrical, 

 narrowly rounded at apex. Ventral margin of valve minutely produced, 

 dorsal margin strongly produced, scobinate and tapered and inclined towards 

 uncus ....... principis-group (part, lima) (p. 209) 



18 (15) Valves incurved and tapered, each to a point, that on left side finely and 



sharply; dorsal margin of left valve usually scobinate, that of right valve 

 serrate in part. Apex of uncus excavate medially or short and tapered. 

 Fulcrum not scobinate. Third abdominal sternite with transverse band 

 of spines ........ aurolineata-group (p. 221) 



— Valves not so formed .......... 19 



