312 Scientific Intelligence. 
showing how even such an extreme change could be wrought out 
by the survival of the fittest in the struggle for existence. “Should,” 
possessors, at a little shorter distance, the attention of enemies 
flying constantly overhead, they would become more and more 
useful, and cause their possessors to become continually more abun- 
dant in proportion to the type, they could therefore serve as the 
itations, and, on the other, makes the acceptation of an originally 
” 
onias; he holds 
: ; the species of Lep- 
that the wretched powers of flight possessed cde Pe needed 
ie 
expect in such cases to find the following series: omg) ked. In 
male of mimetic species, female of same. Speci a only 
his vicinity, Miller has found five species of Leptalis, of w Lept “lis 
four are common and discussed by him. Of these tour, ies, 
melia mimics nothing; all the other three are imitative spec 
and mimic distinct groups of ia : ja ¢ aU 
ling a Heliconian-like Danaid, Mechanitis Lysumn jorea 
