The Making of Species 
species imitated are ‘even more unpalatable than 
the generality of their order.” 
3. It is pointed out that the most distasteful 
groups of butterflies—the Danazde, the Acreine, 
the /thomiing, and the Helizcontne—consist of 
large numbers of species which closely resemble 
one another. This is said to be due to Miillerian 
mimicry. Mayer states that in South America 
there are 450 species of inedible /thomztne which 
display only 15 distinct colours, while the 200 
species of Pafgztzo, which are edible, exhibit 36 
distinct colours. Nevertheless, he says, there is 
no lack of individual variability among the former 
hence their conservatism as regards colour cannot 
be attributed to their having but little tendency 
to vary. 
4. It is asserted that although in many cases 
the mimetic resemblances extend to the minutest 
detail, nevertheless they are not accompanied by 
any changes in the mimetic species except such 
as assist in the production or strengthening of a 
superficial likeness. 
Pictures illustrating such cases of mimicry are 
figured on pp. 241, 247, and 251 of Wallace’s 
Darwinism (1890 edition). 
5. It is stated that mimetic resemblance is not 
confined to colour, but extends to pattern, form, 
attitude, and movement ; that deep-seated organs 
are affected when the superficial resemblance is 
intensified, but not otherwise. Poulton cites 
228 
