III.] INDEPENDENT SIMILARITIES OF STRUCTURE. 97 



rapidly flying and mimicked kinds have not had the wing 

 modified. Such an enemy occasioning increased powers of 



OUTLINES OF WINGS OF BUTTERFLIES OF CELEBES COMPARED WITH THOSE OF 

 ALLIED SPECIES ELSEWHERE. 



1. Outer outline, Papilio gigon, of Celebes. Inner outline, P. demolion, of Singapore 

 and Java. 2. Outer outline, P. miletus, of Celebes. Inner outline, P. sarpedon, 

 India. 3. Outer outline, Tachyris zarinda, Celebes. Inner outline, T. nerv. 



flight, or rapidity in turning, he adds, " one would 

 naturally suppose to be an insectivorous bird ; but it is 



a remarkable fact that most of the 



H 



jenera of fly-catchers 



