THE OOLOGIST 



169 



Two Possible Mig-hktio* "Routes OF 



the Olive -Backed Thrush:— 



Tig, 4-. 



Arrows. Represent Routes Of MiGRPmoK. 

 Dotted area; Winter. 



■RANGE OF S?ECtES. 

 Two possible routes of Olive Backed Thrush Migration. Drawing by R. G. Howes. 



