656 U. Ss. 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, incase they be distinct from G. canadensis, they may possibly be referred to Grus longi- 
rostris of Temminck and Schlegel, in Fauna Japonica, Birds, pl. 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 ina 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 & Locality. |When collected Whence obtained. Orig. | Collected by— 
No. | Age. | No 
IKK. ASeoee Medicine Bow creek. ----- | Aug. 7%, 1856 | Lieut. Bryan --4-..-2.-—- 2245) WisiS.nWiO0d ss nesioceseeee 
Cai) Se ae Sands Hills=) =o -saeeee ee | AUP 95 Looon |eientaWartens = eee =—e| mem == Dr. -Hayden= 2225-5 - 2 -e 
CyB ogo Mimbres to Rio Grande---| a ASS aS So SRosos \eDre WEL erimiyee oo mea aes re] | el ee eae ee 
g394a|Ue =. Riowarandelvalleyresenses||eaanercenan sees | CaptiBeckwith)eea==ee ee see et | seme ae ee aes 
AGIs aes. = Colorado river, Cal--.--- Feb. 19,1855 Maj orsbononysno ee eese se A'Ga| CAS Schotts .sc0 sake eee 
HOS708|<—2--2 Gil fomniaten es een See al cr, a ae Commodore Perry -------|------ Wa Heng. 2. 232tc <a eee 
9492 | Aa ae al akh Plain We doe ee Aug. 13,1853 | Governor Stevens--.---.--- 45 SDiiCooperpeeaia see amare 
9483 | © | Fort Steilacoom --.-..--- Oct? 118538) Dra Suckley-sssee= ----=- 579 | Jceentet as uoeces nce cee 
GRUS FRATERCULUS, Cassin. 
Sp. Cu.—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, 
Whence obtained. | Collected by— 
| 
Catal. Locality. When collected. | 
No. | | 
———— | |_ eer ae 
——— = : 
10378 | Albuquerque, New Mexico..------ | October, 1853 | Lieut: Wihipple.o. --==—-eeeeseee | H. B. Mollhausen------ 
