the charina Group of Pinacopteryx. 



197 



that these Voi River specimens may be regarded as 

 a slightly divergent form of P. liliana. Whether Smith 

 and Kirby's name of gerda may properly be applied to 

 them is perhaps open to question. The character of the 

 scent-scale just alluded to is the occurrence, 

 at or near the junction of the neck with 

 the body of the flask, of a rough-looking 

 granular patch, dark by transmitted light, 

 most conspicuous in liliana from Mombasa, 

 but easily recognisable in the gerda-Yike 

 specimens above mentioned (figs. 8, 9, j>). 

 This appearance is not seen in the scent- 

 scales of charina, simana or venata; a 

 diffused shading, but no definite granular 

 patch, being the nearest approach visible 

 in the corresponding situation. 



When I first investigated the scent- 

 scales in this group, working with some- 

 what limited material, I formed the 

 opinion that P. venata could be easily distinguished from 

 P. simana by the shorter and broader character of its 

 scent-scales.* This was the case with the specimens from 

 which my preparations were made; but the examination 

 of additional examples has shown that the distinction does 



Fig. 9. — P. gerda, 

 Gr. Sm. and 

 Kirb. Scent- 

 scale X 310. 

 p, granular 

 patch. 



Fig. 10. 



Fig. 11. 



Fig. 10. — P. charina. Boisd. Scent-scale x 310. 

 Fig. 11. — P. simana, Hopff. Scent-scale X 310. 

 Fig. 12.— -P. venafa, Butl. Scent-scale X 310. 



not universally hold good. It occasionally, though rarely, 

 happens that a scent-scale from an undoubted specimen 

 of P. venata (as in one from Hagarat in South Kordofan) 

 is as long as an exceptionally short scale from P. simana; 

 and similarly, a scale here and there from P. venata (as 



* Proc. Ent, ttoc. Lond., 1912, p. cxiii. 



