153 Capt. Blakiston on the Birds of the 



StERCORARIUS POMARINUS. 



Mackenzie River (Bernard Ross). Hudson's Bay ('Fauna 

 Bor.-Am.'). 



Stercorarius parasiticus. 



Mackenzie River (Bernard Ross). 



Var. richardsonii, Mackenzie River (Bernard Ross & ' Fauna 

 Bor.-Am.'). I have also received a specimen of Richardson's 

 Skaw, from Hudson's Bay. 



Stercorarius cepphus. 



I have received from Hudson's Bay two specimens of Buffon's 

 Skaw, whence Mr. Murray also notes it, and Mr. Ross from 

 Mackenzie River. 



Larus glaucus. 



I have seen a specimen among some skins from Hudson's Bay ; 

 the wing measured 16| inches. 



Larus glaucescens, 

 Mackenzie River (Bernard Ross). 



115. Larus argentatus. 



Besides my specimen ('Ibis/ vol. iv. p. 10), killed at York 

 Factory, on Hudson's Bay, Mr. Murray also records the Herring 

 Gull from Severn House, a little further south. Besides these, 

 there is a specimen in the Smithsonian Institution from Nelson 

 River ; and Mr. Bernard Ross records it from the Mackenzie. 



Larus californicus. 

 Mackenzie River (Bernard Ross). 



116. Larus delawarensis. 



The Ring-billed Gull, given in the 'Fauna Bor.-Am.' under 

 (according to Lawrence, in Baird's Report) the various names of 

 canus, zonorhynchus , and brachyrhynchus, is an inhabitant of the 

 Saskatchawan, on the lower part of which river my specimen 

 (' Ibis,' vol. iv. p. 10) was obtained. Mr. Murray also gives 

 what he calls a variety of L. zonorliyyichus from Hudson's Bay. 

 Mr. Ross, I find, in a list brought up to June 1862, gives a Gull 

 under the name of L. hrachyrhynchus, and another Larus, name 

 unknown, also Blosipus heermanni. 



