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XV. Mimetic Forms of Papilio dardanus (merope) and 
Acrexa johnston. By Epwarp Bb. Poutrton, D. Se., 
M.A., Oxon., Hon. LL.D., Princeton, F.R.S., Hope 
Professor of Zoology in the University of Oxford, 
Fellow of Jesus College, Oxford. 
{Read June 6, 1906. ] 
PLatTEes XVII-XXII. 
A. MIMETIC FORMS OF Papilio Dardanus, BRowN. 
I. Synepigomie Group bred i 1904 by G. F. Leigh, 
FES. from a trophonius § form of P. dardanus  sub- 
species cenea, near Durban. 
This piece of work is an interesting and important 
addition to the breeding experiments upon P. dardanus 
undertaken by Mr. Leigh in 1902 and 1903. (Trans. Ent. 
Soc., Lond. 1904, p. 677.) As a result of this latest 
inquiry the trophonius 2 form has for the first time been 
bred from a parent of the same form. 
On May 4, 1904, Mr. G. F. Leigh observed a f7o- 
phonius female laying eggs on the food-plant, at Bellair, 
five miles from Durban, 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 X VII, 
Figs. 1-11. The dates of emergence are given in the 
explanation of Plate XVII (pp. 312, 318), so it is not 
necessary to repeat them here. The two unfigured females 
were in both cases cenew 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 II. (SEPT.) 
