some British East African Butterflies. 495 



on Dabida Hill, although I was unable to capture any of 

 them. 



I. Black-and-white Eastern Amauris-centred Combinations 

 from the Coast District of British East Africa. 



This striking series of conspicuous butterflies contains 

 two well-marked combinations, respectively grouped around 

 Amauris niavius, L., sub-sp. dominicanuSy Trim., and round 

 A. ochlea, Boisd. It also includes a number of outlying 

 mimetic forms which have evidently been influenced by 

 the dominant species of black and white Amauris, but do 

 not resemble the pattern of any particular model. 



Although the two combinations are well marked, there 

 is a species, Eiwanthe wakcficldi, Ward, $, which possesses 

 a pattern of the ochlea type and yet upon the wing more 

 closely resembles the dominicanus association. It is pro- 

 bable that the outlying species also serve to hold both 

 combinations together and to weld them into a single 

 complex association of black white-marked species. For 

 this reason, the time relationships of the whole of the 

 members of both combinations at Rabai are recorded in a 

 single table, which shows that many of the species fly 

 together. This diary of captures extends over the eleven 

 months from the beginning of March 1906 to the end of 

 January 1907. 



It must be remembered that, with the exception of the 

 specimens taken on May 12 and on September 15, no 

 special attempt was made to capture as complete a series 

 as possible on a single day. Furthermore, the abundant 

 models were avoided, while rarer species, such as the 

 Euxanthes, were especially sought. Hence the following 

 diary gives a wrong idea of the proportionate abundance 

 of the constituent species. 



Allowing for this, the solid fact of the occurrence of the 

 various members of the two combinations in the same 

 place and at the same time is proved over and over again 

 in the following table : — 



