88 MIMICRY, AND OTHER PROTECTIVE. 
there by P. sznomaus, the female of which so exactly 
resembles it that they can hardly be separated in the 
cabinet, and on the wing are quite undistinguishable. 
But one of the most curious cases is the fine yellow- 
spotted Papilio céon, which is unmistakeably imitated 
by the female tailed form of Papiliomemnon. These 
are both from Sumatra; but in North India P. céon 
is replaced by another species, which has been named 
P. doubledayi, having red spots instead of yellow; 
and in the same district the corresponding female 
tailed form of Papilio androgeus, sometimes considered 
a variety of P. memnon, is similarly red-spotted. Mr. 
Westwood has described some curious day-flying moths 
(Epicopeia) from North India, which have the form 
and colour of Papilios of this section, and two of these 
are very good imitations of Papilio polydorus and 
Papilio varuna, also from North India. 
Almost all these cases of mimicry are from the 
tropics, where the forms of life are more abundant, 
and where insect development especially is of unchecked 
luxuriance; but there are also one or two instances in 
temperate regions. In North America, the large and 
handsome red and black butterfly Danais erippus is 
very common; and the same country is inhabited by 
Limenitis archippus, which closely resembles the 
Danais, while it differs entirely from every species of 
its own genus. 
The only case of probable mimicry in our own coun- 
try is the following :—A very common white moth 
(Spilosoma menthastri) was found by Mr. Stainton 
