BIEDS CAPRIMULGLDAE CHORDEILES HENRYI. 
153 
As a summary of the whole suhject, I am inclined to think that all the varieties described 
belong to one species, varying somewhat with the locality, those from the Atlantic and, perhaps, 
Pacific regions being darkest, without much mottling ; those from the interior province, or from 
the Missouri to the Rocky Mountains, being much more varied, with a tendency to pale grayish 
tints in northern localities, and reddish in more southern, the latter of smaller size. In this 
generalization I would scarcely except the G. henryi. The G. texensis is, however, quite 
different. 
List of specimens. 
Catal 
No. 
Sex. 
Locality. 
When collected 
Whence obtained. Orig'l 
No. 
Collected by— 
Extent. 
Wing. 
Remarks. 
4292 
1522 
1605 
6964 
5592 
7529 
6007 
6008 
6555 
5593 
5201 
5202 
5203 
5594 
8224 
8228 
8877 
8878 
'6013 
Dark variety. 
May 16,1846 
June 10,1844 
May 13,1857 
S. F. Baird 
9.50 
9.50 
25.07 
24.50 
8.17 
8.33 
9 
Lt. Bryan, U.S.A.. 
74 
8.00 
8.25 
8.20 
7.50 
7.70 
7.70 
, 1857 
Vf. M. Magraw 
Dr. Suckley,TJ.S.A.. 
3 
5 
7 
Dr. J. G. Cooper... 
10.00 
24.25 
Pale variety. 
Dr. VV. A. Hammond 
3 
3 
s 
3 
Q 
3 
o 
o 
70 miles west of Ft. Riley. 
85 miles west of Ft. Riley. 
40 miles above Ft. Pierre.. 
June 30.16.36 
June 30,1866 
June 30,1856 
May 30,1850 
48 
51 
VV. fi. VVno.l 
do 
Lt. Warren, U.S.A. 
9. 
9.25 
9.25 
9.25 
9.50 
8.40 
8.50 
22. 
22.25 
23.25 
23. 
21. 
21.50 
20.75 
23.00 
22.25 
8. 
7.25 
8.25 
Dr. F. V. Hayden.. 
August 13, 1856 
Sept. 16,1857 
Lt. F. T. Bryan 
2S0 
7.00 
7.25 
7.50 
Not full grown. 
do 
208 
do 
Black Hills? (Camp 4).... 
Sept. 7,1657 
July 24, 1857 
June — ,1855 
3 
83 
Dr. Kennedy 
7.40 
CHORDEILES HENRYI, Gas sin. 
Western Night-Hawk. 
Chordeiles henryi, Cassin, Illustrations, I, Jan. 1855, 233. 
Sp. Cn. — Female similar to C. virginianus, but the upper parts much more mottled and more rufous. 
Hab. — Rocky Mountains of New Mexico. 
The specimens hitherto collected of this species are not sufficiently perfect to admit of a 
satisfactory description. The characteristics can only be given by comparison with O. virginianus, 
as already described. 
The skin upon which this species was based by Mr. Cassin is a female in very poor condition 
(G690,) and much stretched, which may account for its having been described as larger than 
G. virginianus. This is scarcely the case, as shown by the comparative measurements of the 
two. There is no undoubted specimen of the male bird in the collection before me from Texas, 
the only large one, with a decidedly white patch on the throat, lacking the white marks on the 
end of the tail. 
This species is conspicuously different from Pennsylvania specimens of G. virginianus in the 
very great amount of mottling on the upper parts, which exhibit nothing of the dark tones 
prevailing in the last mentioned skins. The predominent tint of the mottling is a yellowish 
rusty, brightest, and the blotches largest, on the scapulars. The under parts are yellowish 
20 b 
