252 D. S. FLETCHER 



Key to Species 



i Apex of valve incurved towards uncus and finely tapered; dorsal process 



with broad, setose projection near base. Fulcrum one-half as long as 

 aedeagus, apex scobinate ....... sagitta (p. 253) 



- Apex of ventral margin of valve produced in slender, digitate form, not 



incurved towards uncus; dorsal process without setose basal projection. 

 Fulcrum vestigial. ........ tullia (p. 253) 



Zamarada tullia Oberthur 

 (Text-figs 425, 426; PI. 89, figs 812, 813; PI. 122, fig. 1093) 



Zamarada thalia Oberthur, 1912 : 260, 351, pi. 153, fig. 1470 nee fig. 1471; nee 1912 : 258, 



pi. 152, fig. 1459. LECTOTYPE $, Cameroun (BMNH), here designated [examined]. 



[Primary homonym of Zamarada thalia Oberthur, 1912 : 258.] 

 Zamarada tullia Oberthur, 1913 : 237. [Replacement name for Zamarada thalia Oberthur, 



1912 : 260.] 

 Zamarada tullia Strand, 1915 : 178. [Replacement name for Zamarada thalia Oberthiir, 



1912 : 260. Primary homonym of Zamarada tullia Oberthur, 1913 : 237.] 

 Zamarada thalysia Gaede, 1915 : 116. [Replacement name for Zamarada thalia Oberthur, 



1912 : 260.] 



<J genitalia (Text-figs 425, 426). Uncus tapered to blunt apex; base with a pair of slight, 

 lateral processes. Ventral plate of gnathus broadly rounded apicad and scobinate. Juxta 

 weakly sclerotized, with two longitudinal, parallel ridges. Valves symmetrical, apices 

 minutely scobinate; ventral margin produced in slender, digitate form; dorsal process without 

 setose projection near base. Aedeagus and fulcrum similar to those of emaciata. Coremata 

 bright buff. 



§ genitalia (PI. 89, figs 812, 813). Lamella antevaginalis slender and weakly sclerotized, 

 anterior margin narrowly incised medially. Lamella postvaginalis consisting of a broad 

 transverse band convexly curved, posterior margin minutely but densely scobinate. Posterior 

 tip of corpus bursae sclerotized with transverse, medial ridge. 



Measurements. Fore wing: $ 16-5— 17-5 mm; § 16-5 mm. Antennal pectinations: 06. 

 $ 3 X diameter of shaft. 



Externally closely similar to emaciata; distinguished by the denser, finer grey 

 striation of the hyaline area concentrated in the posterior half of each wing, by 

 the presence of a minute discal spot on the hind wing and by the duller, matt-grey 

 of the non-hyaline terminal area (PI. 122, fig. 1093). The male may be further 

 distinguished from emaciata by the bright buff colour of the coremata. 



In the male genitalia the form of the valves and in the female genitalia the 

 form of the lamella postvaginalis are diagnostic. 



Distribution. Cameroun, Gabon. 



Material examined. 



Zamarada thalia Oberthur, lectotype $ here designated, Cameroun ('Kamerun'): 

 Lolodorf, 1894-1895 (L. Conradt): 'Zamarada thalia <$ Obthr. figurer la patte pour 

 montrer les 2 epines de l'article median: Tullia Obthr., Thalia ex error' [both 

 labels in Oberthiir's hand- writing] : black and white copy of fig. 1470: Geometridae 

 genitalia slide no. 5616, in BMNH. 



