252 DR. A. G. BUTLER ON BUTTERFLIES [Feb. 18, 
15. IoLAUS GLAUCUS. 
Tolaus glaucus, Butler, P. Z. 8. 1885, p. 766. 
é 2, Zaila, Somaliland, 23rd and 28th May, 1895 (Capt. Nurse). 
16. TERACOLUS CALAIS, var, DYNAMENE. 
Pontia dynamene, Klug, Symb. Phys. pl. vi. figs. 15, 16 (1829), 
Q@, Aden, 8th March, 1895; ¢ 9, 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. pl. 7. figs. 1-4 (1829). 
@ 9, 12th February; Lahej, 6th March; Haithalhim, 23rd 
March, 1895 (Col. Yerbury). 
In my paper on Lepidoptera from Somaliland (P. Z. 8. 1885), 
when describing 7’. ocellatus, a species the existence of which I had 
previously suspected, I observed, ‘I have also no doubt that a 
species intermediate between 7. 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 Jdmais castalis, which scarcely differs from the Indian 
T, vestalis, and which, as I have since discovered, exhibits similar 
slight variations. 
In my paper on Lepidoptera from Aden (P. Z. S. 1884, p. 478) T 
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 me that in the case of 7. phi- 
sadia, 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. Yerbury to 
look out for females of 7’. phisadia having this character. In this 
he was perfectly successful, the two females obtained at Lalej and 
Haithalhim being indistinguishable from females of Teracolus 
ochreipennis (a species only doubtfully distinct from 7’. vestalis). 
In this species, therefore, we still have evidence ot descent from 
the black and white forms of India. 
18. TERACOLUS VI. 
Teracolus vi, Swinhoe, P. Z.8. 1884, p. 435, pl. xxxix. figs. 6, 7. 
g, Aden, 20th February, 1895 (Col. Yerbury). 
19. TERACOLUS CHRYSONOME. 
Pontia chrysonome, Klug, Symb. Phys. pl. 7. figs. 9-11 (1829). 
9, Zaila, Somaliland, 28th May, 1895 (Capt. Nurse). 
20. TERACOLUS HELIOCAUSTUS. 
_ Teracolus heliocaustus, Butler, P. Z. S. 1885, p. 768, pl. xlvii. 
figs. 8, 9. 
2, Zaila, Somaliland, 6th June, 1895 (Capt. Nurse). 
A much faded example. 
