Ixxv 



irregular white centre formed by the replacement of blue scales 

 by white, and it was surrounded by a broad zone of darkly 

 pigmented scales, differing from those of the general surface 

 of the wing in that they also gave a deep blue colour by inter- 

 ference of light. These constituents were greatly modified 

 in the females. In (2), (4) and (5) the only element remaining 

 was the deep blue of the outer zone, which, invading the 

 centre, formed a single continuous patch, evanescent in (2). 

 In (1) and (3) the blue of the outer zone was barely visible, 

 while the inner area, lacking the white centre, spread out- 

 wards, especially in (1), invading the area of the zone. The 

 red scales of (1) were more abundant than in the male and 

 therefore the lilac tint more pronounced. The patch of (3) 

 was smaller and irregular in outline, its tint cobalt blue due 

 to a mixture of pale and dark blue scales. 



In the Tahiti female the marking was nearer to that of the 

 male than any of the Rarotonga females, the white central 

 scales being present and the outer zone better developed than 

 in (1) and (3). 



The relations illustrated in Mr. Simmonds' specimens of 

 bolina, required to be studied in larger numbers of examples 

 from the same and other localities, but it was hoped that the 

 above account would be of some use as a guide. The com- 

 parisons here drawn had been greatly facilitated by Dr. 

 Eltringham's kindly help in the rather difficult analysis of 

 the colour effects. 



East African Danaine butterflies resting, crowded 

 IN a bamboo clump, during the hot hours of the day. — 

 Prof. PouLTON said that he had received only that morning 

 a letter from one of their Fellows — Mr. C. F. M. Swynnerton, 

 Game Warden of the Tanganyika Territory; and he wished 

 to call the attention of the meeting to the following interesting 

 observations recorded by the writer : — ■ 



" September 19, 1920. Dar es Salaam. 



" Here, for some weeks, Amauris ochlea, Boisd., and, in 



association with it but in smaller numbers, A. niavius, L., 



subsp. dominicanus. Trim., have been present in (literally) 



enormous numbers in the public gardens. They are completely 



