some Britislh East African Butterjlies. 519 



of Amauris lohenjnla, E. M. Sharpe, when upon the wing. 

 It occurs plentifully in British East Africa in localities 

 where Amauris ccheria and alhimacvlata are dominant. 

 Thus I have received many from the neighbourhood of 

 Fort Hall captured by my kind friends Mr. and Mrs. 

 S. L. Hinde. Colonel Manders, who captured it with one 

 of the Amauris models at Delagoa Bay, informs me that 

 he thought it a good mimic on the wing, but when the 

 set species were compared the very different jDatterns led 

 him to conclude that he had made a mistake. The whole 

 Geometrid genus Alctis is undoubtedly highly distaste- 

 ful. Its ordinary pattern, e. g., that of A. hdcita, Linn., of 

 the West Coast and A. lihyssa, Hopff., of the East, is pro- 

 bably the centre of an important combination (see p. 522) 

 associated with that which surrounds Danaida chrysippus, 

 but possessing strongly-marked independent aposematic 

 elements of its own. In spite of these latter, the associa- 

 tion with chrysippus has always been looked upon as 

 synaposematic — a conclusion now strongly confirmed by 

 this undoubted resemblance upon the wing of another 

 species of Aletis to another Danaine model. 



Aletis monteironis only differs from A. lihyssa in the tint 

 of the ground colour, a peculiar ochreous in the former, a 

 brilliant fulvous in the latter. A. monteironis is probably 

 a form of A. lihyssa which has undergone a change in the 

 tint of the ground colour in areas where the ccheria (or 

 lohenguki) and alhimaculata models are dominant. In spite 

 of the special resemblance to A. lohcngula observed by Mr. 

 Marshall the distribution of the moth clearly indicates 

 association with both the other allied forms of Amauris, 

 viz. ccheria and alhimaculata. E. B. P. 



III. Danaidct {Limnas) chrysippus- centred Goriihination in 

 British East Africa. 



1. The Primary Danaine model. In East Africa gener- 

 ally the form dorippus, Klug (klugii, But!.), is far more 

 common than the type form, probably in the proportion 

 of ten to one. 



D. chrysippus seems very subject to the attacks of 

 Dipterous parasites. Out of 10 pupse which I bred from 

 larvjB at Weithaga no less than 9 were destroyed by the 

 larvae of a fly, which has been identified by Mr. E. E. 

 Austen as belonging to the genus Blepharipoda, of the 

 Tachinidm. These emerged on various dates in April, 



