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. 
Measurements. 
2 & aoe 
3 : Locality. When collected.) Whence and how q Collected by— | 9 SE g 
5 So _ obtained. = 2 3 B= 3 | 
® | ¢ d s3|s 2/28 
| 3 E:| 2 2 2 | wo 
s v4 20 4 = 2/8 
oF |e S & ja 3 |e 
69 09N zoe eNelsoniriver sh pba se=———| See ee eee DAGunneeseas se |----|---+---+--------|------ | eae ee | ee 
5170 | © | Mouth Vermilion, on Mo--| Oct. 25, 1856 | Lt. Warren__--.-- |----| Dr. Hayden----- 12.75| 26.75} 9.00 
GAL Sel doseaes dos. ess [Sree TaD bao dormers bases We Nees doco s 11.75] 23.75] 8.00 
4130 | O | Tamaulipas, Mexico-.-.--|__._..-_....-- Titacouch a= See | eee eee 12.00; 25.00) 8.50 
6b058|2===| MIGPaso wlexas!-- ane aa see eae Major Emory------ S54) de EGR sabe oleae ss 
476) Seae| EUS els  SOUNG,aWi.0 lana s|=see neem eee Drs (Cooper ----=-= 236e| SSeS Fes 6st 544) Seeeed SeSscel |Ssose= 
AA5 9S Eea= |e CapemMlattery, Wel esses oeoeneseeee ite Drow bridgessse|se cs | seem ewes ats aa | eee | emcee 
aa \\so==| Shoalwater Bay, Wi. Ds-es|=ss=5esss-—— 4" MriCoopers =. s=- += ee Pea oe Soe e ae e- | eee on] oeee-|se—== = 
5831 |.---| Fort Steilacoom, W. T. -| Oct. 1, 1856 | Dr. Suckley ------ 598 |pnaaece we coce sce | sees asece=|eacen 
DO29 el eae | eae eae dosste=- dofssse=—= Sept. dss 6nj2e— sos d0ss2eecce oe RV Es RS SeSee6 ceca SasaHesacce4|sS6555 
OS 25a aes seeeia= dosiis-- dosze-<-2-2|-s5-<5 do:2.322|22-2=2 (We 5e86e56e 649 | Bon ceee ae eee 12. 00) 25. 50|------ 
6833 | © |.----- do=====— dozsat-kes-jbeess J doz. .3|ses 255 doseesessea: 546 eee mee aero 13.00) 26. 13)---.-- 
OS 32m aoe sees ae dosss=- = doe 33a5—22|0-255— dost 533) se88 dosssss-c2t - 54i||Pa- Se acss esses 13. 50} 26. 25|---.-- 
ABSBalSSsal|E Jase 5 dos2e-2= dosst J.82-|225-25 domes. Dr. WPotts seen seen 7. Sasa Set ac bese sabe et |e 
4500 |_..-| San Francisco, Cal -....-|.....--.------ Lt. Williamson---.|----| Dr. Newberry---|------|.-----|------ 
C8ToR Fh California 22=. See. Sees See ee |e doll ae 2Sea|' (Dr¥ Heerman 222 | 328) 5- Sts eee 
S484 S| Petaluma; Calt@e. seo acos|feceesoeeee sec i Samuels -222--- ae cS |b PP Nm 
B4T5 Seen Hanta Clara, Calteceso=-cleses sss scoe ee Dr) Cooperseesaee wene|ssceaccoescceste e|Cecceeleoosee | eoeaae 
S015 eas Coloradomivers Calica ses| samme eee Major Emory-----. a | PANISCHOUL= eam | aeeeine| seems hosose 
W998 4/2. S)¢MexicOsoccnssccccceenss|ssosecneaoeuee Us Gould eee eee ag AR |e pe ap papel ba Fe gE OOO 
FALCO AURANTIUS, Gm. 
Fulco aurantius, Gu., Syst. Nat. I, 283. (1788.) 
Falco rufigularis, Daupin, Trait d’Orn. IL. 131. (1800.) 
Faleo thoracicus, Donovan, Naturalists’ Repository, II, (not paged, 1824:) 
Falco cucullatus, Swarnson, Cab. Cy. p. 340. (1838.) 
Falco deiroleucus, TEMMINCK. 
Ficures.—Vemm. Pl. Col. 348; Donovan, Nat. Rep. II, pl. 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, tibie, 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 44 inches. Female larger. 
Hab. Mexico, Texas, South America. Spec. in Nat. Mus. Washington, and Mus. Acad. Philadelphia. 
