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Show 252 DR. A. G. BUTLER ON BUTTERFLIES [FEB. 18, 15. IOLAUS GLAUCUS. Iolaus glaucus, Butler, P. Z. S. 1885, p. 766. d 2 i zaila, Somaliland, 23rd and 28th May, 1895 (Capt. Nurse). 16. TERACOLUS CALAIS, var. DYNAMENE. Pontia dynamene, Klug, Symb. Phys. pi. vi. figs. 15, 16 (1829). 2 , Aden, 8th March, 1895 ; rf $ , 8th and 12th May, 3rd and 7th June, 1894 (Capt. Nurse). 17. TERACOLUS PHISADIA, var. ARNE. (Plate X. fig. 13.) Pontia arne, Klug, Symb. Phys. pi. 7. figs. 1-4 (1829). 2 2, 12th February; Lahej, 6th March; Haithalhim, 23rd March, 1895 (Col. Yerbury). In m y paper on Lepidoptera from Somaliland (P. Z. S. 1885), when describing T. ocellatus, a species the existence of which I had previously suspected, I observed, " I have also no doubt that a species intermediate between T. phisadia and T. vestalis will ere long be discovered." In Staudinger's ' Exotische Schmetterlinge' an African species was subsequently described and figured under the name of Idmais castalis, which scarcely differs from the Indian /. vestalis, and which, as I have since discovered, exhibits similar slight variations. In m y paper on Lepidoptera from Aden (P. Z. S. 1884, p. 478) I pointed out that several species of Butterflies presented simple variations, which had become fixed as local races in various parts of Africa and Asia; and it struck m e that in the case of T. phisadia, the female of which is extremely variable, we might still expect to find evidence of its derivation from a black and white type similar to those of India ; I therefore asked Col. Terbury to look out for females of T. phisadia having this character. In this he was perfectly successful, the two females obtained at Lahej and Haithalhim being indistinguishable from females of Teracolus ochreipennis (a species only doubtfully distinct from T. vestalis). In this species, therefore, we still have evidence of descent from the black and white forms of India. 18. TERACOLUS VI. Teracolus vi, Swiuhoe, P. Z. S. 1884, p. 435, pi. xxxix. figs. 6, 7. d, Aden, 20th February, 1895 (Col. Yerbury). 19. TERACOLUS CHRYSONOME. Pontia chrysonome, Klug, Symb. Phys. pi. 7. figs. 9-11 (1829). 2 , Zaila, Somaliland, 28th May, 1895 (Capt. Nurse). 20. TERACOLUS HELIOCAUSTUS. Teracolus heliocaustus, Butler, P. Z. S. 1885, p. 768, pi. xlvii. figs. 8, 9. 2 , Zaila, Somaliland, 6th June, 1895 (Capt. Nurse). A much faded example. |