i 94 D - s - FLETCHER 



Characterized in the male genitalia by the asymmetrical, bifid, spine-tipped 

 fulcrum; by the spirally twisted tenth tergite and sternite with the uncus situate 

 ventrally and the ventral plate of the gnathus dorsally; by the greatly reduced 

 and tapered membranous valve and its densely setose dorsal process, broad at 

 base, thence straight to a narrowly rounded unspined apex. 



Characterized in the female genitalia by the presence of a hollow-stemmed, 

 leaf-like process with a serrate posterior margin, which extends posteriorly from 

 the sterigma. 



In addition to the two named species included in the group, two further species 

 await description when adequate material is available; one is represented by a 

 specimen collected at Bo in Sierra Leone, the other by a specimen from Jonga 

 at 5500 ft on Mt Cameroun. 



Key to Species 



1 Maximum width of non-hyaline terminal area at apex of fore wing 1 mm or 



less. (J. Left arm of fulcrum longer than right. $. Serrate posterior 

 margin of leaf-like process on sterigma four times width of base of its hollow 

 stem .......... acosmeta (p. 194) 



— Maximum width of non-hyaline terminal area at apex of fore wing 2-3 mm. £. 



Right arm of fulcrum longer than left. $. Serrate posterior margin of 

 leaf-like process on sterigma twice width of base of hollow stem pinheyi (p. 195) 



Zamarada acosmeta Prout 

 (Text-figs 320, 321; PL 69, figs 726, 727; PL 114, fig. 1036) 



Zamarada acosmeta Prout, 1921 : 157, text-fig. 16. Holotype $, Burundi (BMNH) 

 [examined] . 



(J § (PI. 114, fig. 1036). Wings almost entirely hyaline, weakly tinged with yellowish green 

 in fresh specimens and sparsely striate with brownish grey; discal spots minute; costa of fore 

 wing buff, striate with brownish grey. Non-hyaline terminal area very slender, not broader 

 than 1 mm, very finely brownish orange, then brownish grey (pi. 5, C2, birch grey) to termen. 

 Underside of non-hyaline terminal area uniformly brownish grey (pi. 5, E2-E3). 



^ genitalia (Text-figs 320, 321). Tenth tergite and sternite twisted through 180 degrees; 

 triangular uncus situate ventrally, scobinate medial plate of gnathus dorsally. Fulcrum 

 bifid, each arm spined apicad along its central core and each tipped with a stout spine, left 

 arm longer than right. 



§ genitalia (PI. 69, figs 726, 727). Serrate posterior margin of leaf-like process on sterigma 

 four times as wide as the base of its hollow stem. Operculum with a short, digitate process 

 at one side anteriorly. 



Measurements. Fore wing: £ 14-16 mm; $ i5-o-i6-5 mm. Antennal pectinations: 

 ^ 12 X , $ 3 X diameter of shaft. 



Distinguished externally by colour and pattern; unisona in the metrioscaphes- 

 group, the only species with which acosmeta might be confused, differs in lacking 

 the slender, grey terminal band. 



Distribution. Malawi, Zambia, N.W. Angola, Zaire, Burundi, Uganda. 



