THE TYPE 245 



tigations I must regard these insects as forms of only 

 one single species, Pseudacraea eurytus (Linnaeus, 1758)." 

 Along with these forms of one species are figured thirteen 

 different species of Planema, each a model for a form of 

 eurytus ; and on another plate " five white banded female 

 specimens of Pseudacraea eurytus, together with the 

 females of five species of Planema.'''' 



Pseudacraea eurytus ^ itself was named by Linnaeus in 

 1758. It is sexually dimorphic. The male is tawny 

 orange and blackish brown, the female black and 

 white, with the white areas roughly corresponding to 

 the pattern of the orange in the male, but being more 

 contracted on the hind wing. It is a West African form, 

 mimicking the West African dimorphic species Planema 

 epaea. 1 have, however, taken on Bugalla Island a single 

 female closely approximating to the typical eurytus ; 

 it is intermediate between two forms described below, 

 namely tirikensis and terra, having the fore wing pattern 

 of terra, but the black and white colour of tirikensis, while 

 the pattern of the hind wing closely approximates to that 

 of eurytus and thus differs from the pattern of tirikensis. 



In 1919, in a small isolated patch of forest on the 

 Kyagwe (mainland) north coast of the lake, I took a 

 fine male which is not essentially different from the 

 typical male eurytus. 



All the Pseudacraeas mentioned in this chapter, 

 except kuenowi, are now known to be forms of eurytus, 

 using the name in its widest sense. It has a distribution 

 throughout the tropical and subtropical forests of Africa, 

 from west to east, and from northern Uganda to Pondo- 

 land, south of Natal. It is, however, very scarce in 

 East Africa and Rhodesia, 



The form imitator was described from Natal by Roland 



Trimen in 1873 : it mimics Planema aganice and, like 



the model, is sexually dimorphic, although the difference 



in colour between male and female is not so marked as 



^ See the two coloured plates for illustrations of models and mimetic 

 forms of this species. 



