196 MIMICRY IN N. AMERICAN BUTTERFLIES 



of the principal band, the resemblance is certainly 

 mimetic and not due to affinity ; for lorquini, 

 ancestral in certain other features, has here lost 

 the original whiteness of this marking, preserved 

 not only in the Old World but in Limenitis 

 arthemis and L. weidermeyeri (Edw.) of the New. 

 An excessively slight deepening of the yellow 

 tint could be made out in southern individuals 

 from the area occupied by the model. In order 

 to detect the difference, a long series of northern 

 specimens should be placed beside a similar 

 series from the south and the two compared in 

 a strong light. But far larger numbers than 

 I have seen ought to be examined from this point 

 of view, and, if it were possible to make it, the 

 comparison of perfectly fresh specimens would 

 be most desirable. 



3. The fulvous marking at the anal angle of 

 the hind wing is excessively variable and often 

 absent from specimens in all parts of the range. 

 The comparison of a very large amount of mate- 

 rial is necessary before we can reach any safe 

 conclusions as to the existence of mimetic re- 

 semblance in this feature, and the same is true 

 of the extremely variable under surface of lor- 

 quini, in which the development of the inner 

 row of sub-marginal bluish lunules may be mime- 

 tic of californica. This feature was generally 

 suppressed in the Vancouver Island specimens 

 I have seen. 



We now come to the consideration of certain 



