10 
U. >S p. R. R, EXP. AND SURVEYS-ZOOLOGY—GENERAL REPORT. 
feather edged with rufous. This stage is represented in Swainson’s plate in Fauna Boreali— 
Americana. The adult has the upper parts entirely light bluish slate color; nearly every feather 
with a black central line, and is even lighter colored and of more delicate and handsome shades 
than as given by Audubon. Between these well-defined and easily recognized stages there are 
other intermediate plumages impossible to describe, except in general terms. 
List of specimens. 
Catalogue number. 
Sex and age. 
Locality. 
When collected. 
Whence and how 
obtained. 
Original number. 
Collected by— 
Measurements. 
Point of bill to end 
of tail. 
Between the tips o 
outstretched wings, j 
Wing from carpal 
joint. 
6909 
Nelson river, H. B_ 
D. Gunn___ 
5170 
0 
Mouth Vermilion, on Mo.. 
Oct. 25 1856 
Lt. Warren_... 
Dr. Hayden_ 
12. 75 
26. 75 
9. 00 
5171 
11. 75 
23. 75 
8. 00 
4130 
O 
Tamaulipas, Mexico_ 
Lt. Couch__ 
12. 00 
25. 00 
8. 50 
5505 
El Paso, Texas_ 
J H. Clark. 
4476 
Puget’s Sound, W. T_ 
Dr. Cooper_ 
4459 
Cape Flattery, W. T __ 
4477 
Shoal water Bay, W. T_ 
5831 
Fort Steilacoom, W. T. . 
Oct. 1, 1856 
598 
5829 
Sept. 1, 1856 
548 
5828 
549 
12. 00 
25. 50 
5833 
Q 
546 
13. 00 
26. 13 
5832 
547 
13. 50 
26. 25 
4588 
_do_do_ 
_ __clo 
4500 
San Francisco, Cal_ 
Dr. Newberry_ 
6875 
$ 
California__ 
do _ 
Dr. Heerman_ 
5483 
s 
Petaluma, Cal_ 
4475 
Santa Clara, Cal_ 
4615 
Colorado river, Cal_ 
53 
A. Schott_ 
7998 
Mexico_ 
J Gould 
1. 
FALCO AURANTIUS, Gm. 
FjIco aurantins, Gm., Syst. Nat. I, 283. (1788.) 
Falco rufigularis, Dai:din, Trait d’Orn. II. 131. (1800.) 
Falco thoracicus, Donovan, Naturalists’ Repository, II, (not paged, 1824.) 
Falco cucullalm, Swainson, Cab. Cy. p. 340. (1838.) 
Falco deiroleucus, Temminck. 
Figuees. —Ternm. PI. Col. 348 ; Donovan, Nat. Rep. II, pi. 45. 
About the size of, or rather smaller than F. columbarius. Entire upper parts bluish slate color, many feathers having darker 
centres, and concealed transverse bands of black. Throat, neck before, and breast yellowish white ; body beneath, black, with 
numerous transverse narrow bands of white ; abdomen, tibia;, and under tail coverts dark rufous. Under wing coverts black, 
with numerous transverse bands and circular spots of white ; quills ashy black, with transverse bands of white on their inner 
webs ; tail black, the two middle feathers tinged with ashy, narrowly tipped with white, and with about seven irregular 
transverse bands of white ; bill horn color ; legs yellow. 
Total length—male—9£ to 10 inches, wing 7£ to 8, tail 4 to 4£ inches. Female larger. 
Hab. Mexico, Texas, South America. Spec, in Nat. Mus. Washington, and Mus. Acad. Philadelphia. 
