the charina Group of Pinacopteryx. 203 



is long and slender, shaped like a surgeon's curved bistoury. 

 That of the gerda-\ike specimen (fig. 18) is of similar charac- 

 ter, but slightly sharper at the tip. The scent-scale is of 

 the remarkable shape described on p. 196, and is charac- 

 terised by the presence of a dark granular patch at the 

 junction of the narrow portion of the lamina with its 

 expanded base (fig. 8, p). 



(4) P. gerda, Grose Smith and Kirby. — The type described 

 and figured under this name,* from Mombasa, is probably 

 a dry-season male of P. liliana; but there is a form, as 



Fig. 17. — P. liliana, Gr. Smith. Uncus :•; 54. 



already mentioned, occurring at Voi, Mlegwa and Maranga 

 (all in British East Africa), the male of which is identical 

 in appearance with gerda as figured and described, and 

 to which the same name may perhaps be applied, at all 

 events provisionally. The upperside of the male in this 

 form appears to be always free from dark veining, and the 

 dark margin of the fore-wing is somewhat further prolonged 



FlQ. 18. — /'. liliana, Gr. Smith. Uncus X 54. 



towards the anal angle than in P. liliana $. There is 

 usually an indication of a discocellular spot on the fore- 

 wing, but not on the hind-wing. Beneath, the general 

 surface of both wings may be white, as in a specimen Erom 

 Mlegwa (January) and one from Voi (May) ; or the hind- 

 wing and apex of fore-wing may be -yellow; pale, as in 

 another specimen from Voi (May), or deeper, as in two 

 from Voi (October). The discocellular spots are present 

 on both wings, but very taint on the hind-wing in both 



* Rhop, Ivvol.. Pinacopteryx, PI, I, figs. 10, 11. 



