86 



BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 



Buteo borealis lucasanus Ridgw. 



Average 



10.27 9.26 3.51- 1.79- 1.62+ 1.43+ .97+ .77- 



Buteo borealis calurus (Cass.). 



a s 



Average, 



15.72+ 9.07+ 3.57+ 1.67+ 1.51+ 1.33+ .90- .76+ 



1 Collection "William Brewster. 



'^ Collection U. S. Nat. Museum. Type, 17,212. 



3 Collection Amer. Mus. Nat. Hist. 



