132 JOURNAL, BOMBAY NATURAL HISTORY SOCIETY, 1890. 



greenish of a duller and less rich shade than in S. nourmahal. 

 Female differs in precisely the same way as the male, and in addition 

 has the white spot at the apex of the foremng on the upperside more 

 than twice as large. 



Described from numerous examples captured during the last three 

 or four years in Bhutan by the native collectors of the late Mr. Otto 

 Moller and Mr. A. V. Knyvett. Having lately had an opportunity 

 of examining the true S. nourmahal in the latter gentleman's col- 

 lection, I am able to describe the Bhutan species. The differencee 

 given above in the coloration and markings of the two species 

 appear to be perfectly constant. 



For the benefit of those who do not understand Arabic, I may 

 note that Nur-mahal means "Light of the House" and that Nur-i- 

 Nissa is " Light of Women. " 



PREHISTORIC BOMBAY.* 

 By W. E. Hart. 



Those who have walked about Bombay with their eyes open 

 during the last twenty years must be struck with the changes which 

 have taken place during even that short period, and which are tend- 

 ing entirely to alter the physical aspect of the island. As more 

 houses are built, and more roads constructed in a space limited by 

 the waters of the sea, what is closest at hand will be taken to furnish 

 the materials of which they are to be made, and the ground on which 

 they are to stand. So it is that we now see on all sides our hills 

 being levelled, our hollows raised, and our foreshores reclaimed, till 



* This paper was originally read by Mr. W. B. Hart, as a popular lecture, at the 

 Sassoon Mechanics' Institute, Bombay, on the 10th March 1890. It is republished, 

 here, as it is likely to be of interest to many members of the Society, inasmuch as 

 it gives, in a convenient form, the result of the researches of such men as Buist, 

 Clark, Wynne, Medlicott, and Blanford, collected from a large number of technical 

 and scientific publications. — Editor. 



