862 Address of A. R. Wallace at the Glasgow Meeting. 
which determine color are in their case more complex—yet 
there are distinct indications of some effect of the kind, and we 
must devote some little time to their consideration. 
One of the most curious cases is that of the parrots of the 
West Indian Islands and Central America, several of which 
have white heads or foreheads, occurring in two distinct genera,* 
while none of the more numerous parrots of South America 
are so colored. In the small island of Dominica we have a 
very large and richly-colored parrot (Chrysotis augusta) cor- 
responding to the large and richly-colored Papilio homerus of 
amaica. 
The Andaman Islands are equally remarkable, at least six of 
the peculiar birds differing from their continental allies in being 
much lighter, and sometimes with a large quantity of pure 
white in the plumage,t exactly corresponding to what occurs 
among the butterflies, 
In 
among the butterflies. ; 
n Celebes we have a swallow-shrike and a peculiar small 
crow allied to the jackdaw,t whiter than any of their allies m 
the surrounding islands, but otherwise the colors of the 61 
call for no special remark 
In Timor and Flores we have white-headed pigeons,§ and 4 
long-tailed flycatcher almost entirely white.| 
In the small Lord Howe’s Island we have the recently 
tinct white rail (Notornis alba), remarkably contrasting with its 
allies in the larger islands in New Zealand. 
as 
but- 
terflies, in the smaller Moluccas, the Andamans, and Madagas 
ar locali- 
There are other cases, however, in which local mnie 
seem to favor the production of preservation of intense cr! 
* Pionus albifrons and Chrysotis senilis (C. America), Chrysotis Salleei pare 
+ Kittacincla albiventris, Geoci albigularis, ia Andamanensis, 
grisola, var., Fanthenas palumbotdes, Osmotreron chloroptera. 
lopus cinctus, P. albocinctus. || Tchiterea afinis, var. 
? 
