10 



U. R. P. K. R, EXP, AND SURVEYS — ZOOLOGY — GENERAL REPORT. 



feather edged with rufous. This stage is represented in Swainson's plate in Fauna Boreali — 

 Amf ricana. 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. 



FALCO AURANTIUS, Gm. 



FjUco aurantim, Gm., Syst. Nat. I, 283. (1788.) 

 Fako Tufi/jularvs, Daudin, Trait d'Orn. II. 131. (1800.) 

 Falco thoracicus, Donova.n, Naturalists' Kepobitory, II, (not paged, 1824.) 

 Falco cucullatiu, Swainso.n, Cab. Cy. p. 340. (1838.) 

 Falco ddrolmcus, Tisiminck. 

 FiQuaxs. — Temm. PI. Col. 348 ; Donovan, Nat. Rep. II, pi. 45. 



About the size of, or rather smaller tlmn F. columliaritts. Entire upper parts bluish slate color, many feathers having darker 

 centres, and concealed transverse bands of black, lliroat, neck before, and breast yellowish white ; body beneath, black, with 

 numerous transverse narrow bonds of white ; abdomen, tibiic, and under tail coverts dark rufous. Under wing coverts black, 

 with numerous transverse bands and circular spots of white ; quills ashy black, with tr.ansvcrso liaiids of white on tlioir inner 

 webs ; tail black, the two middle feathers tinged with ashy, narrowly tipped with wliite, and with about seven irregular 

 transverse bands of white ; bill horn color ; legs yellow. 



Total length — male— 9J to 10 inches, wing 7J to 8, tail 4 to 4J inches. Female larger. 



Hab. Mexico, Texas, South America. Spec, in Nat. Mus. Washington, and Mus. Acad. Philadelphia. 



