1893.] Evolution in the Genus Megascops. 649 
will deny that all of the forms of Megascops are descended from 
a common ancestor, and if through climatic or environmental : 
conditions they have become subspecifically differentiated in 
various localities, I see no reason to doubt that in like manner 
under the influence of humidity, temperature, acquired char- 
acter and forest area, which will be felt for countless genera- 
tions to come, that the species now known as Megascops asio 
will one day be separated into species and subspecies—the 
former represented by the original gray, and the latter by the 
more modern red. 
