1891.] ON NEW BUTTERFLIES FROM EASTERN AFRICA. 187 



The three species therefore form a gradational series, all extra- 

 ordinarily alike externally, and merely differing in the sizes of their 

 skulls. 



Mr. Jackson's discovery of this interesting connecting-link in the 

 genus is the more remarkable as R. splendens has been found both 

 to the north of its habitat, in Abyssinia, and to the south, on and 

 near Mt. Kilimanjaro, whence Mr. H. C. V. Hunter obtained four 

 specimens in 1888, which he was good enough to present to the 

 National Collection. These specimens are quite identical with 

 Abyssinian examples. 



It may just be mentioned, although probably of but little importance, 

 that U. annectens has not the darker muzzle ordinarily present in 

 R. splendens, that it has a paler tail, and that its bulls3 appear to 

 be proportionally rather smaller. 



Specimens h and c are too young to be determined with absolute 

 certainty, at least until the exact local ranges of R. annectens and 

 R. splendens are known. They are remarkable for their very long, 

 soft and silky hair, and their peculiar bluey-grey colour, utterly un- 

 like the reddish-brown characteristic of the adult. In fact, with- 

 out the skulls, one might have been excused for looking upon them 

 as representing a totally distinct form. 



2. Descriptions of New Butterflies collected by Mr. F. J. 

 Jackson^ F.Z.S., in British East Africa, during his recent 

 Expedition . — Part I. By Emily Mary Sharpe. 



[Eeceived March 3, 1891.] 



(Plates XVI. & XVII.) 



This paper records the names of some new species of Papilionidce, 

 Pieridce, and Acrceidce discovered by Mr. F. J. Jackson in the 

 Kikuyu and Sotik districts and on Mount Elgon. I shall hope, 

 later on, to give an account of the entire collection made by Mr. 

 Jackson in these regions ; but as it contains a number of Lyecenidce, 

 this project will take some little time to accomplisb, as the working 

 out of the last-named family is a very difficult matter. 



Subfam, Papilionin^. 

 1. Papilio mackinnoni, sp. n. (Plate XVI. fig. 1.) 



Nearest to P. constantinus of Ward, from Ribe (Afr. Lepid., 

 part i. pi. i. figs. 1, 2), but easily distinguished by the position of 

 the ochreous band across both wings, the absence of the submarginal 

 ■ row of yellow markings, and by the want of the large oval spot in 

 the discoidal cell. 



General colour rich brown, almost black, with all the spots and 

 markings ochreous. 



Fore wing. Hind margin scalloped with a half-circular edging of 



