II] BATESIAN AND MULLERIAN 17 



fresh instances of mimetic resemblance have been 

 recorded from all the great tropical areas of the world, 

 and the list is being added to continually. Most 

 active in this direction is the Oxford School under 

 Professor Poulton to whose untiring efforts are largely 

 due the substantial increases in our knowledge of 

 African butterflies contributed by various workers in 

 the field during the past few years. Whatever the 

 interpretation put upon them, there can be no question 

 as to the value of the facts brought together, more 

 especially those referring to the nature of the families 

 raised in captivity from various mimetic forms. With 

 the considerable additions from Africa^ during the 

 past few years several hundreds of cases of mimicry 

 must now have been recorded. Some of the best 

 known and most striking from among these will be 

 described briefly in the next two chapters. 



^ The African mimetic butterflies have been recently monographed 

 by Eltringham in a large and beautifully illustrated work — African 

 Mimetic Butterflies, Oxford, 1910. 



P. M. 



