206 DIVERSITY OF THE SEXES. 



more striking than in the skippers, where anti- 

 geny of a remarkable kind, and especially struc- 

 tural antigeny, is almost universal. 



When this chapter was written, it was my pur- 

 pose to discuss still another element of permanent 

 variation, affecting in a very striking manner the 

 color of butterflies, and to a certain degree their 

 form, namely, Mimicry ; but this must be deferred 

 to another occasion, with the mere mention that 

 there are proofs of the action of this force, even 

 among our native butterflies. One of them in 

 particular, the Viceroy [see Fig. 84], of which 

 mention has often been made, departs altogether 

 from its nearest allies to mimic the attire of 

 another butterfly, the Monarch [see Fig. 106], dif- 

 fering widely in structure. But without entering 

 into details upon this point, I trust I have already 

 accomplished my purpose in showing that there 

 is something more than mere external beauty in 

 the color, design, and infinite variety of markings 

 which make the butterfly the common type of all 

 that is exquisite in nature. 



