MAYNA.RD on Cori/s Shearwater. 53 



The birds seem to breed very late here. Some young 

 Uoh'ms {Tiirdus migratorius) left the nest on August 23, 

 and the last of a nest full of Hermit Thrushes ( Turdus 

 jmllasi) was hatched on the same day. 



NOTES ON THE DIFFERENCES BETWEEN COKY'S 

 SHEARWATER, PUFFINUS BOREALIS, AND 

 THE GREATER SHEARWATER, PUFFINUS 

 MAJOR. 



By C. J. Maynard. 



Having recently had an opportunity of examining speci- 

 mens of Cory's Shearwater described as Puffinus horealis. 

 by Mr. C. B. Cory (Bull. Nutt. Orn. Club, Vol. YI, April, 

 1881, p. 84), and of comparing them with the Greater 

 Shearwater [Puffinus major), I offer the following notes as 

 a result of these studies. 



The bill of P. horealis is almost entirely yellow, being 

 dusky only in a band across both mandibles and on the top 

 of the upper, whereas that of P. major is nearly or wholly 

 bluish. The size of the bill of horealis is much larger, 

 exceeding 2 inches in length and .80 in depth at the nos- 

 trils, that of major being seldom if ever as much as 2 

 inches long and only about .50 in depth. 



The size of horealis is larger ; the wing equalling or 

 exceeding 14 inches in length, while in major it seldom if 

 ever exceeds 13.50 and is usually shorter. The feet of 

 the two species are about the same size, but those of horea- 

 lis are decidedly lighter in color. 



In general coloration horealis is much more ashy above, 

 especially anteriorly; the feathers of the head and upper 



