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XV. Mimetic Forms of Papilio dardanus {mei'oiic) and 

 Acrxa johnstoni. By Edwaud B. Poulton, D. Sc, 

 M.A., Oxen., Hon. LL.D., Princeton, F.R.S., Hope 



Professor of Zoology in the University of Oxford, 

 Fellow of Jesus College, Oxford. 



[Read June 6, 190Gd 



Plates XVII-XXII. 



A. Mimetic forms of Papilio Dardanus, Brown. 



I. Synejngonic Group hred in 1904 h/ G. F. Leiffli, 

 F.E.S., from a trophonius ^ form of P. dardanus su_,h- 

 specics cenea, near Durban. 



This piece of work is an interesting and important 

 addition to the breeding experiments upon F. dardanus 

 undertaken by Mr. Leigh in 1902 and 1903. (Trans. Eut. 

 Soc, Lend. 1904, p. 677.) As a result of this latest 

 inquiry the tro2)honius $ form has for the first time been 

 bred from a parent of the same form. 



On May 4, 1004, Mr. G. F. Leigh observed a tro- 

 phonius female laying eggs on the food-plant, at Bellair, 

 five miles from ])urban. Natal. He collected the eggs 

 but the parent butterfly escaped. From these eggs Mr. 

 Leigh succeeded in breeding six males and seven females. 

 Of these all the males and five of the females are repre- 

 sented about two-fifths of the natural size on Plate XVII, 

 Figs. 1-11. The dates of emeroence are given in the 

 explanation of Plate XVII (pp. 312, 313), so it is not 

 necessary to repeat them here. The two unfigured females 

 were in both cases cenea forms : — one greatly deformed 

 and shrivelled (pupated June 30, 1904, emerged July 30 : 

 the ninth to emerge) ; one not included in Mr. Leigh's 

 consignment (it was the twelfth to emerge). 



(a) The males. 



The six males of this interesting synepigonic series are 

 represented on Plate XVII, Figs. 1-6. If compared with 

 TRANS. ENT. SOC. LOND. 1906. — PART 11, (SEPT.) 



