80 D. S. FLETCHER 



gnathus, in which the arms are tapered and fuse medially to form a weakly sclerotized 

 band in place of a ventral plate. The uncus is pyriform, modified in oxybeles and 

 setosa, where the apical half is more slender, and in melpomene, where the base is less 

 dilate. The dorsal margin of the valve is usually sclerotized and the apical part 

 scobinate; in setosa and incompta the valves are weakly sclerotized and setose, 

 without scobination; the dorsal surface of the valves is not densely clothed with 

 hair-scales; the hair-scales of the coremata are light buff, greyish yellow or black. 

 The aedeagus is usually well sclerotized and tapered in the apical half, except in 

 oxybeles and melpomene where the apex is rounded, with one or more processes 

 arising at about two-thirds of its length. Vesica with or without cornuti. The 

 hind tibia in the male is simple in some species, dilate and ornamented with a pencil 

 of long hair-scales in others. 



In the female genitalia the sterigma usuaUy bears spiculate-edged folds and one 

 or more digitate projections or dilations extending anteriorly; the projections are 

 wanting in melpomene, subinterrupta and fibulata; the posterior region of the corpus 

 bursae is sclerotized. 



Key to Species and Subspecies 



i Apical half of valve wholly membranous or very weakly sclerotized, ventral 



and dorsal margins parallel, setose but never scobinate; apex evenly rounded; 

 basal half of dorsal margin weakly sclerotized, smooth, minutely scobinate 

 or with a coarsely scobinate ridge ........ 2 



- Apical half of valve not so ornamented ; if so shaped, then one margin scobinate 



to apex ............ 4 



2 (1) Basal half of dorsal margin of valve with a coarsely scobinate ridge. Digitate 



projection from aedeagus longer than width of aedeagus . dasysceles (p. 88) 



- Basal half of dorsal margin of valve weakly sclerotized, smooth or minutely 



scobinate. Projection from aedeagus shorter than width of aedeagus . 3 



3 (2) Fulcrum weakly sclerotized and straight, not extending to apex of aedeagus, 



which is blade-like apicad. Male hind femur short-scaled; hind tibia 

 simple and short-scaled ...... incompta (p. 100) 



- Fulcrum well sclerotized in apical half and curved dorsad over apex of aedeagus, 



which is digitate and finely tapered. Male hind femur fringed with long, 



buff hair-scales; hind tibia dilate and similarly scaled . . setosa (p. 101) 



4 (1) Valve weakly sclerotized; ventral and dorsal margins parallel; apex rounded; 



apical three-fourths of dorsal margin weakly but densely scobinate. Fulcrum 

 longer than aedeagus, apex rounded; two large, asymmetrical, tapered 

 projections at one-half ....... subinterrupta (p. 103) 



- Valve and fulcrum not so formed ........ 5 



5 (4) Valve finely tapered apicad, apex straight or curved towards uncus; width 



of tip of valve similar to width of tip of uncus ..... 6 



- Valve rounded or truncate at apex. Apex of dorsal margin sometimes with 



beak-like projection inclined towards uncus . . . . . . 11 



6 (5) Valve curved through 90-120 degrees towards uncus in apical fourth . . 7 



- Valve not so formed ........ 



7 (6) Apex of valve acicular. Apex of fulcrum bifurcate 



- Valve and fulcrum not so formed ...... 



8 (7) Depth of cleft in apex of fulcrum equal to greatest width of fulcrum. Digitate 



projection from aedeagus smooth and tapered, equal in length to greatest 



