ANTHOCARIS II. 
the larvae and chrysalids would best determine the relationship, but 1 have been 
unable to find a description of these stages in Ausonta. It is to be noticed that 
where a species becomes widely dispersed and sections are separated by impass¬ 
able barneis, the larvs8 are often first to differ, and may become quite distinct 
before any wide difference is observed in the imago. As in the case of the Pa- 
pilios, Turnus, and Eurymedon , where the butterflies differ but in color, while 
the larvrn are strikingly unlike. So with several of the Graptas figured in Yol. 
I. of this work. And in determining the identity or otherwise of two forms 
from opposite sides of the globe, especially if they inhabit the regions below the 
Boreal, so that the segregation may be presumed to have been complete for a 
long period, the preparatory stages are a most important element in the com¬ 
parison. If the separation is marked in these, even though not clear enough in 
the butterflies to be fixed by description — as, for instance, in the present case 
of Ausonia and Ausonides — it is safe to conclude that on one or both sides 
there has been a departure from the original • type, and that henceforward be¬ 
tween these two there will be nothing but divergence. They have reached a 
point at which they may properly be treated as distinct species. 
