656 
U. 8. 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 , hut otherwise quite similar. Mr. Cassin suggests 
that, in case they he distinct from G. 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 hill, feet, 
and whole hodv 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. 
Catal. 
No. 
Sex & 
Age. 
Locality. 
When collected. 
Whence obtained. 
Orig. 
No. 
Collected by— 
5786 
Medicine Bov/ creek._ 
Aug. 7,1856 
Lieut. Bryan _ _ 
224 
W. S. Wood. 
8914 
Sand Hills. 
Aug. 9,1S56 
Lieut. Warren -_ 
Dr. Hayden_ 
9493 
Dr. Plenry___ 
9394 
Bio Grande valley 
Capt. Beckwith_ 
4623 
Colorado river, Cal_. 
Feb. 19,1855 
Major Emory_ 
46 
A. Schott._ 
10379 
California_____ 
Commodore Perry_ 
W. Heine - -- -- - _____ 
9492 
Takli Plain, W. T. 
Aug. 13,1853 
Governor Stevens_ 
4 
Dr. Cooper_-_ 
9483 
o 
Oct. 1, 1S53 
Dr. Suckley_ 
579 
GRUS FRATERCULUS, Cassin. 
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 withoUj. 
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, 3.1G. 
Hub .—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. 
Catal. 
No. 
Locality. 
When collected. 
Whence obtained. 
Collected by— 
10378 
Albuquerque, New Mexico_ 
October, 1853 
Lieut. Whipple__ 
H. B. Mollhausen- 
