154 MIMICRY IN N. AMERICAN BUTTERFLIES 



genus Thyridia that led Fritz Miiller to his 

 hypothesis, and formed the title of the paper 

 in which he first expounded it. The Lycoraeini 

 are widely different from any of the Old World 

 Danainae and are sometimes separated from them 

 as a distinct sub-family. The second group of 

 Danaines, found in North America as well as 

 South, belongs to the Old World section Danaini, 

 and is in every respect strongly contrasted with 

 the Lycoraeini. Its species, divided into two 

 genera Anosia and Tasitia by Moore, are not 

 known to enter into mimetic relations with any 

 of the other butterflies of this southern Region. 1 

 Furthermore, they not only belong to a dominant 

 Old World section of the Danaines, but are even 

 closely allied to particular species within it. It 

 is probable that there are only two well-marked 

 species of Danaini on the American Continent, 

 and that the various forms encountered over this 

 vast area are the geographical races or sub-species 

 of these two. In north temperate America they 

 are the well-known models for mimicry, Anosia 

 plexippus extending far into Canada, and Tasitia 

 Berenice and its form strigosa not ranging beyond 

 the southern States. 



In 1897, at the Detroit meeting of the American 

 Association for the Advancement of Science, I 

 suggested - that the Mimicry of Anosia pkxippus 



1 It is possible, however, that there are incipient resemblances 

 to Anosia in certain S. American Acraemae, 

 * Proc. Am. Assoc. Adv. Sd., 1897, xlvi. 244. 



