18 



the dimorphic forms of a single species." In a few weeks 

 this question will also be settled by the arrival in Oxford of 

 families bred from these two forms in the Lagos district by 

 that most generous helper of the Department, Mr. \V. A. 

 Lamborn. 



[Since the above paragraph was w ritten, the question has 

 been settled ; for two families of known (female) parentage 

 have been received from West Africa. The female parents 

 were both forms of E. dubia, and yet antJicdon is abundantly 

 represented in both sets of ofifspring, each containing over loo 

 individuals. E. R. P., May 22, 1911-] 



The great interest of Mr. Millar's discovery is that the 

 dimorphism is unconnected with sex, males and females being 

 equally present in both forms. Dimorphism or polymorphism 

 in one sex, as in the females of P. daj-danus, mentioned below, 

 is well known. Dimorphism like that of the Euralias has 

 hitherto been looked upon as exceedingly rare. 



A beautiful pair of Hypolimnas {Euralia) deccptor, bred 

 May 7-8, 1909, from eggs laid Mar. 24-5, was also presented 

 by A. D. Millar, Esq. The female parent was captured at 

 Mount Edgcumbe. The same generous donor has presented 

 a fine series of bred Pseudacraeas and other Natal butterflies. 

 These have received their printed labels, but have not yet 

 been catalogued. They will be acknowledged in detail in next 

 year's Report. 



An extremely interesting family of Papilio dardanus ccnac 

 was purchased from Mr. G. F. Leigh, F.E.S. The female 

 parent, of the relatively rare tropJionius form, was captured 

 June 26, 1910, at Pinetown, Natal (about i,coo ft.), and laid 

 62 eggs on June 27 and 28. Mr. Leigh succeeded in breeding 

 no less than ^^ butterflies, all of which emerged from the 

 pupa between Aug. 26 and Sept. 8, 19 10. Of these 25 are 

 males (non-mimetic) and 30 females, a result which supports 

 the conclusion that the rarity of the females is only apparent 

 and due to their retiring habits. Of the 30 females 22 are 

 the cenea form, mimicking the commonest Danaine butterflies 

 in Natal, Aviaiiris ecJieria and A. albiriiacidata: 4 are tropho- 

 nins like the female parent, mimicking the abundant Danaine 



