1926] Swa/rth: Birds and Mammals from the Atlin Region 123 



I am using the binomial name for this bird in the conviction that 

 the three white-crowned sparrows, leucophrys, gambelii, and wwttalli 

 are three distinct species. There are various trenehajat external char- 

 acters of plumage and other parts distinguishing them, there are just 



Fig. J. Map showing breeding ranges, approximately outlined, of (1) Zonotrichia 

 leucophrys, (2) Zonotrichia gambelii, and (3) Zonotriohia nuttalU. 



as notable differences of song, and the breeding ranges and migration 

 routes also are indicative of specific differences (see fig. J) . As regards 

 external characters, while I am aware that there are various published 

 statements of the existence of intergi-adation between these forms, these 



