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Show 1891.] ON NEW BUTTERFLIES FROM EASTERN AFRICA. 187 The three species therefore form a gradational series, all extraordinarily 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 M r . 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 R. annectens has not the darker muzzle ordinarily present in R. splendens, that it has a paler tail, and that its bullae appear to be proportionally rather smaller. Specimens b 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 unlike the reddish-brown characteristic of the adult. In fact, without the skulls, one might have been excused for looking upon them as representing a totally distinct form. 2. Descriptions of N e w Butterflies collected by M r . F. J. Jackson, F.Z.S., in British East Africa, during his recent Expedition .-Part I. By E M I L Y M A R Y S H A R P E. [Received 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 M r. Jackson in these regions ; but as it contains a number of Lyccenidce, this project will take some little time to accomplish, as the working out of the last-named family is a very difficult matter. Subfam. PAPILIONIN^E. 1. P A P I L I O M A C K I N N O N I , sp. n. (Plate X V I . 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 |