2 40 Annals Entomological Society of America [Vol. II, 



25. The arrangement of the North American butterflies 

 which converge on Pharm. philenor, in concentric rings each 

 mimetic of that lying within it, strongly supports a Miillerian 

 interpretation of all except the species (diana) in the outermost 

 layer. 



26. Limenitis (Adelpha) calif ornica of the Pacific coast is 

 probably a Limenitis mimic of the South American genus Adelpha, 

 to which its southern sub-species hredowi bears a stronger resem- 

 blance. 



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. calif ornica. 



28. Certain features in which lorqnini superficially resem- 

 bles calif ornica 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 hy- 

 pothesis 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 resemblance to the tropical American 

 genus Adelpha. They are retained by bredowi in Arizona, north 

 of the range of any true Adelpha }^ 



3 1 . 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 prob- 

 ably 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 in the address afford some of 

 the very best material for testing the operation of Mendel's Law 

 under natural conditions. 



I wish again to caution my readers that the above conclusions 

 have been drawn from the careful study of a limited number of 

 examples. Although insufficient in quantity, the English mater- 

 ial is as a whole excellent in quality. Thus, many of the Pacific 



^* In the southernmost part of the range of bredowi, in Guatemala, the resem- 

 blance to Addpha 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)."^ 



