656 



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



feathered, and in another, 4623, these extend further along the occiput than in the adults. 

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

 that, in case they he distinct from G. canadensis, they may jjossihly be referred to Grus longi- 

 roslris 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. 



Locality. 



Medicine Bow creek 



Sand Hills 



Mimbres to Eio Grande. 



Rio Grande valley 



Colorado river, Cal 



California 



Takh Plain, W. T 



Fort Stellacoom 



When collected. 



Aug. 7,1856 

 Aug. 9, 185C 



Feb. 19,1855 



Aug, 13,1853 

 Oct. 1, 1853 



Whence obtained. 



Lieut. Bryan 



Lieut. Warren 



Dr. Henry 



Capt. Beckwith . . 



Major Emory 



Commodore Perry . 

 Governor Stevens., 

 Dr. Suckley 



Orig. 

 No. 



224 



46 



4 

 579 



Collected by- 



W. S. Wood . 

 Dr. Hayden. 



A. Schott. . 

 W. Heine .. 

 Dr. Cooper . 



GRUS FRATERCULUS, Cassin. 



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

 to the G. canailciuis, but much smaller. Color light bluish grey. Primaries entirely black ; the shalls dark brown withou, 

 white. 



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

 white ; the middle of crown and occiput reddish. Wing, 17.50 ; tarsus, 7.1)0 ; eummissuie, 3.1G. 



//«6.— Now IVIexico. 



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 sliaftSj instead of their being pluiiil)eous 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. 



