656 
U. S. P. R. E 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 6*. canadensis, but otherwise quite similar. Mr. Cassin suggests 
that, in case they be distinct from G. canadensis, they may possibly 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. 
Catal. Sex & 
No. Age. 
Locality. 
When collectec 
Whence obtained. 
Orig. 
No.- 
Collected by — 
5786 
89 Mr 
9193 
9394 
4023 
10379 
9492 
9483 
Medicine Bow creek. 
Sand Hills 
Mimbres to Bio Grande 
Bio Grande valley 
Colorado river, Cal 
California 
Takh Plain, W. T 
Fort Steilacooni 
Aug. 7,1856 
Aug. 9, 1856 
Feb. 19, 1855 
Aug. 13,1853 
Oct. 1,1853 
Lieut. Bryan 
Lieut. Warren 
Dr. Henry.. 
Capt. Beck with 
Major Emory 
Commodore Perry 
Governor Stevens. 
Dr. Suckley 
W. S. Wood 
Dr. Hay dei 
4 
579 
A. Schott. . 
W. Heine .. 
Dr. Cooper . 
GEUS FRATEKCULUS, Cassin. 
Sp. Ch. — Size small. Bdl 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 t 
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, 7.60 ; 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. 
Catal. 
No. 
Locality. 
When collected. 
Whence obtained. 
Collected by— 
10378 
Albuque 
rquo, New Mexico 
October, 1853 
Lieut. Whipple - 
H. B. Mollhausen 
