208 MIMICRY IN N. AMERICAN BUTTERFLIES 



27. Limenitis (Najas) lorquini, in some respects 

 the most ancestral of the North American species 

 of the group, is in other respects a mimic of 

 L. californica. 



28. Certain features in which lorquini super- 

 ficially resembles californica are on the average 

 more strongly developed in the area where the 

 two species overlap, while they diminish when 

 lorquini passes northward of this area. 



29. The differences between bredowi, ranging 

 entirely south of lorquini, and californica are such 

 as to promote a superficial resemblance between 

 the latter and lorquini, supporting the hypothesis 

 that the resemblances between them have been 

 caused by reciprocal approach (Diaposematism). 



30. The differences which distinguish bredowi 

 from californica are such as to promote a resem- 

 blance to the tropical American genus Adelpha. 

 They are retained by bredowi in Arizona, north 

 of the range of any true Adelpha. 1 



31. The detailed study of these resemblances 

 on the Pacific coast of North America leads to 

 the conclusion that the Mimicry is in an incipient 

 stage and that it has been reached and is probably 

 still advancing by minute increments, that the 

 evolution is ' continuous ' to the last degree. 



32. In addition to their bearing upon the 

 problems of Mimicry, the examples considered 



1 In the southernmost part of the range of bredouri, in Guatemala, 

 the resemblance to Adelpha was very slightly augmented in the 

 only two specimens from this locality I have had the opportunity 

 of studying (Trans. Ent. Soc. Lond., 1908, 485). 



