208 Mr. S. A. Neave : some hionomic 



number of specimens there are to be found many points 

 of interest. We can hardly fail to notice that nearly every 

 species which exists in large numbers (and has therefore 

 been successful in the struggle for existence) almost in- 

 variably forms the model for other species, or itself exhibits 

 Mlillerian mimicry with other abundant and distasteful 

 species. In some cases it is true a few models, viz. 

 certain species of Planema, were only taken in very small 

 numbers, but when we see that their mimics (spp. of 

 Psendacr.va) were also equally scarce, it is allowable to 

 suppose that either owing to their retiring habits or some 

 other such cause these species were overlooked, or that the 

 collection was made near the edge only of their area of 

 distribution. 



Association of Amauris erheo'ia jacksoni, Sharpe, and A. 

 albimaculata, Butler, with A. psj/ttalea f. damoclides, Stand. 



On examining a large series of both Amauris echcria 

 and A. albimaculata, which, as Messrs. Rothschild and 

 Jordan * have recently pointed out, are clearly distinct 

 species, I was much struck with the difference between the 

 Victoria Nyanza specimens and those from Southern Africa. 



The echcria specimens have long since been described by 

 Miss Sharpe as A. jacJcsoni,-f a distinct species, but are 

 doubtless not more than a geographical race of A. ccheria. 



The alhimacuhta specimens are extremely like, if not 

 identical with A. hanningtoni of Butler, J which is also 

 only a form of albimaculata. I shall endeavour to show 

 that both these forms differ from typical South African 

 ones in a common direction, and that these differences are 

 due to the presence of A. psytta/ea, bringing all three 

 species into a clearly marked synaposematic group. 



The Uganda specimens of both species, more especi- 

 ally the ^ ^, bear a marked general resemblance to 

 A. 2Jsyttcdca damoclides, Stand. The chief character by 

 which this resemblance is obtained seems to be the 

 markedly greater average size and roundness of the spot 

 within the discoidal cell of the fore wing. I have there- 

 fore measured both the length and breadth of this spot 

 in a number of specimens from South Africa, East Africa, 

 and Uganda. 



The results are appended in the following table: — 



* Nov. Zool. X, p. 504. t P- Z. S. 1891, p. 633. 



I P Z. S. 1888, p. 91. 



