656 



U. S. p. R. K EXP. AND SURVEYS — ZOOLOGY — GENERAL, REPORT. 



feathered, aud in another, 4623, these extend farther along the occiput than in the adults. 

 These are smaller than typical G. canadensis, -hut otherwise quite similar. Mr. Cassin suggests 

 that, in case they he distinct from 0, canadensis, they may possibly he referred to Grus longi- 

 rostris of Temminck and Schlegel, in Fauna Japonica, Birds, pi. 72. 



There is much variation in size of different specimens of this species with age ; the bill, feet, 

 and whole body apparently growing considerably, long after the perfect feathers have been 

 attained. 



There is an essential difference between G. canadensis and americanus in the shape of the 

 granulated portion of the head. In americanus this extends backwards in a point to the 

 occiput, and beneath the eye to behind the ear, involving the side of the entire lower jaw. In 

 G. canadensis it does not extend below a line from the centre of the eye to the gape, and poste- 

 riorly it is bifurcated by the anterior extension of the occipital feathers, instead of running 

 back in a point. The granulation, too, is much more conspicuous, and not concealed by black 

 hairs, as in the other. 



List of specimens. 



GRUS FKATEECULUS, Oassin. 



Sp. Ch. — Size small. Bill very short ; its gape less than middle toe. Gonys straight, but bent upwards. Generally similar 

 to the G. canadensis, but much smaller. Color light bluish grey. Primaries entirely black ; the shafts dark brown withou^ 

 white. 



Young, with the head feathered to the bill ; the feathers generally above marked with pale rusty. Cheeks and chin grayish 

 white ; the middle of crown and occiput reddish. Wing, 17.50 ; tarsus, 7.50 ; commissure, 3.16. 



Hab. — New Mexico. 



This species, although in many respects similar to the young G. canadensis, differs in much 

 smaller size, proportionally shorter and more slender bill, and much darker primaries, which 

 are quite black, with dark brown shafts, instead of their being plumbeous brown with white 

 shafts. The single specimen is immature, though perhaps nearly grown ; the adult probably 

 has the top of the head granulated and without perfect feathers. 



List of specimens. 



