154 
U. S. P R. R. EXP. AND SURVEYS—ZOOLOGY—GENERAL REPORT. 
white, transversely barred with dark brown. The Y-shaped mark on the throat is of a rusty 
tinge, and much obscured by having its feathers tipped or spotted at the end with dark brown. 
The white patch on the wing is situated nearer the carpal joint than the tip of the primary, and 
is rather restricted, not crossing to the outer web of the first and second primaries. It extends 
only over the five outer quills. The tail has about ten transverse hands which are conspicuously 
yellowish rusty above. 
This typical specimen has the second quill rather longest, and all the primaries tipped with 
pale rusty, an evident indication of immaturity. In other specimens, apparently the same, the 
first quill is longest, the primaries without any paler tips, and the Y-shaped mark on the throat 
not obscured by the dusky blotches. 
As already stated, no undoubted males referable to this species are in the collection before 
me, none having the white marks on the tail. 
Compared with female specimens of G. virginianus, the upper parts exhibit much more rufous 
-mottling above, thus excluding almost entirely the dusky shades. The coverts are tipped with 
a much more extended and continuous shade of pale brownish yellow. The white spot of the 
wing is smaller and nearer the carpal joint. The tail is much lighter, the dark transverse bars 
narrower. The toes and middle claw are shorter, (possibly not fully grown.) 
I am by no means satisfied as to the right of this specimen to specific distinction from G. 
virginianus , as it is decidedly immature and is very similar in many respects to rufous varieties 
of the latter species. It is barely possible that these varieties may also belong to G. henryi ; if 
so, however, I am at present unable to define the two species in any satisfactory manner. A 
larger collection, in better condition, may hereafter throw some light on the subject not now 
attainable. 
List of specimens. 
Catal. 
No. 
Locality. 
When collected. 
Whence obtained. 
Orig’l 
No. 
Length. 
Stretch 
of wings 
Wing. 
6698 
Rio Grande valley _ 
1853.. 
Capt. Beckwith__ _ _. 
8. 00 
4977 
Fort Cbadbonrne, Tex __ 
Dr. Swift__........ 
8.00 
5046 
Crossing of Pecos_ 
July 11, 1855 
Capt. J. Pope_... 
107 
9.50 
23. 50 
8.00 
5045 
May 9, 1855 
_.do__ .... .... 
73 
•6005 
Dr. T. C. Henry_ 
8.40 
CHORDEILES TEXENSIS, Lawrence. 
Texas Night-Hawk. 
Cliordeiles brasilianus, Lawrence, Ann. N. Y. Lyceum, V, May 1851, 114, (Texas,) (not of Gm. 
Cassin, Ill. 1,1855, 238. 
Cliordeiles sapiti, Bon* Conspectus Avium, I, 1849, 63. 
Cliordeiles texensis, Lawrence, Ann. N. Y. Lyc. VI, Dec. 1856, 167. 
Sx>. Ch —Much smaller than C. virginianus, but similar. White on the wing extending over only four outer primaries, the 
bases of which, as well as the remaining ones, with other quills, have round rufous spots on both webs. Under tail coverts and 
abdomen with a strong yellowish rufous tinge. Female more rufous and without the white spot of the tail. Length 8.75; wing 7. 
Hab .—Rio Grande Valley and south ; west to Gulf of California. 
This species in many respects resembles C. virginianus , but some of its markings and its 
much smaller size will at once serve to distinguish the two. 
Selecting a specimen (3957) ^from Santa Caterina, Mexico, as a type, the prevailing color 
