production of resemblance in allied species of Butterflies, 425 
may cause it to become latent or disappear, and thus pro- 
duce a geographical. race or species. 
It has been suggested to me that though the proposition 
that these mimetic combinations are really little more 
than climate acting independently on the various allied 
species is probably correct, yet at the same time I have 
not disproved that they are mimetic associations. 
If this really be so, it seems to me that those who 
consider that my explanation is inadequate and _ still 
maintain that these are all mimetic combinations, should 
bring forward more evidence than they have hitherto done 
in support of their contention. 
Note.—That the blue sheen on the wing of an Huploca 
is produced in any way by climate is a proposition that 
would not be approved of by Professor Poulton (ssays on 
Evolution, p. 241); to those who have never had the good 
fortune to see these insects alive and who may wish to be 
further informed, I may say that in Sikkim and Burma 
they are found in gloomy forests and thick jungle, and look 
when in flight as brown butterflies of a uniform tint; it is 
only when they cross a sunlit patch of forest that one notices 
the blue flash; in such localities insectivorous birds are 
rare. H. mulciber is not uncommonly found in more open 
country. 
Since writing the above I have obtained the follow- 
ing data, which, however, is far from being all that is 
needed :— 
Moen Rainfall Tei Wet days 
Max. Min. | 
rans) 58 aah 80 60 45°57 — | i144 
Entebbe, 3,906 ft.. . | 87°8 59 50°86 Si eth! 
Kikuyu, 6,700 ft. . . | 68°38 52 50°67 _ 137 
In 1907 | 
45°64 
