— 508 — 
pattern bearing the same relation to the typical encedon that the 
niobe female bears to the trophonius female of Papilio dardanus. 
Corresponding changes in the Acræa and the Papilio have con- 
verted a mimic of D. chrysippus into a mimic of Planema tellus. 
Apart from the important facts as to the occurrence and relative 
proportions of models and mimics, the chief result of the present 
paper appears to me to be the strong support it affords to the 
Müllerian as opposed to the Batesian theory of mimicry. This is 
seen in the numbers of the mimetic forms, in the group to which 
some of them belong, — the Acræinæ, — and above all in the 
existence of secondary mimicry or the mimicry of mimics. The 
females of Acrwa jodutta also clearly prove that polymorphism 
in mimicry does not furnish evidence in favour of a Batesian 
interpretation ; for jodutta is certainly a distasteful member (1) 
of a distasteful group, and is itself mimicked by Acrea althoffi. 
The perfection of the resemblance attained by the Acræine 
mimics also refutes another conclusion which, like the last, has 
been held by distinguished naturalists, víz. that a precise and 
detailed likeness is inconsistent with a Múllerian interpretation. 
In concluding this paper I wish again to express my warm thanks 
to my friend Dr. C. A. WIGGINS, who has given me the oppor- 
tunity of working out these most interesting collections and has 
generously presented them to the Hope Department of the Oxford 
University Museum, where they will be readily accessible to all 
naturalists. î 
(1) Acraa jodutta has recently been shown to be distasteful by some hitherto 
unpublished experiments carried on in the Lagos district of Southern Nigeria 
by my friend Dr. W. A. LAMBORN. 
