Interior of British North America. 47 



Institution at Woolwich ; so that there can be no doubt of the 

 identity of my eggs. Now Dr. Brewer figures this Buzzard's 

 egg (N.A. O. pi. 3. fig. 26) as being "of a yellowish white," 

 "marked with large blotches of a light, but very distinct, 

 purplish grey," and measuring " 2^ by lii inches," — whereas 

 my eggs present very much more the appearance of the eggs of 

 the Common Buzzard, and exhibit similar variations. One of 

 them is white, with large distinct blotches and smaller specks 

 of two shades of brown ; another is more obscurely blotched 

 with paler brown, and at the same time freckled nearly all over. 

 They measure — 



Spec. a. 2*6 by 2*0 inches, 



Spec. b. 2*5 by 1"95 inches, 

 being thus considerably larger than is represented by Dr. 

 Brewer, besides being quite differently coloured. Mr. Bernard 

 Ross seems doubtful about this bird on the Mackenzie. 



11. Circus hudsonius. (See 'Ibis,' vol. iii. p. 319.) 

 Also common on the Mackenzie (Bernai-d Ross). 



12. Aquila canadensis. (See 'Ibis,' vol. iii. p. 319.) 

 Also Mackenzie River, to the Arctic Coast (Bernard Ross). 



13. Haliaetus LEUCOCEPHALUS. (See ' Ibis,' vol. iii. p. 319.) 

 Also Mackenzie River, to the Arctic Coast (Bernard Ross). 



14. Pandion carolinensis. (See 'Ibis,' vol. iii. p. 320.) 

 Also Mackenzie River, to the Arctic Coast (Bernard Ross). 



15. Bubo virginianus. 16. Bubo arcticus. 



In my first paper (' Ibis,' vol. iii. p. 320) the light-coloured 

 variety of the Great Horned Owl was placed as a distinct species 

 from B. virginianus. I am, however, very doubtful of the correct- 

 ness of this view, and consequently would prefer keeping it under 

 the original name ; otherwise we shall have to allow at least three 

 species, all differing from the type. Professor Baird, of the 

 Smithsonian Institution, whose complete ornithology of North 

 America has been published as a volume of the ' Pacific Railroad 

 Reports ' by order of the United States Government, has had 

 perhaps greater facilities for examining into this subject than 

 any one else ; he thus sums up (p. 50) : — " We have, therefore. 



