Sjyccies of the Genus Limcnitis. 487 



recent appearance of an Adelpha-VikQ model in a portion 

 of its range. It is extremely difficult to believe that so 

 imperfect a result wouM liave been produced in a member 

 of such a sensitive group if contact with the model had 

 been prolonged. 



Finally there is the fact that, as shown by Godman and 

 Salvin, the southern form hrcdowi extends into Arizona 

 mucli beyond the range of any true Adelplia, while ex- 

 amples from the most southern part of its range in 

 Guatemala only exhibit, in the minute detail described 

 on p. 485, an increased likeness to the Adelphas. The 

 mimetic resemblance of hredoivi is an established and 

 stable product, but slightly increased by deepest pene- 

 tration into the area of the models, maintained well 

 beyond their northward limit, and only modified when 

 the range of lorquini is entered in California. 



The relationship of this interesting species to its Adelpha 

 models indicates a marked susceptibility to influences of 

 the kind, and supports the conclusion that the northern 

 form has been reciprocally modified by the presence of 

 its abundant mimic, lorquini. 



CONCLUSIONS. 

 A. The Eastern Section of North America. 



1. The Old World ancestor of the Danaine butterfly, 

 Anosia ijlexixipus, invaded the New World by way of the 

 north, at a time sufficiently remote to permit of the acqui- 

 sition of generic distinction. 



2. The invader was mimicked by an indigenous species 

 of Limcnitis, closely similar to and probably identical with 

 L. artheviis, which thus originated Z. archipjnis. 



8. A second closely allied Old World Danaine invaded 

 the New World as Lanaida Icrenice. This later invasion 

 is so recent that the generic characters remain unchanged. 



4. In Florida, the second Danaine intruder has modified 

 the mimic of the earlier intruder into a superficial like- 

 ness to itself, thus producing the floridcnsis form of L. 

 archippus. 



5. The specially protected PKiJilio {Pliarmacopihagus) 

 philcnor is mimicked by three species of Papilio, the 

 different stages to which the resemblance is carried in- 

 dicating recent modification. 



