66 PACIFIC COAST AVIFAUNA No. 11 
195 (342) Buteo swainsoni Bonaparte 
SwaInson Hawk 
Synonyms—Buteo insignatus; Buteo obsoletus; Buteo harlani, part; Brown 
Hawk; Swainson Buzzard; Harlan Hawk, part. 
Status—Common in summer through the interior valleys west of the desert 
divide and south and east of the humid coast belt; many breeding records for 
the San Diegan district, south to Escondido, and for the San Joaquin-Sacramento 
basin. Recorded north to Shasta Valley, Siskiyou County (C. H. Merriam, N. 
Amer. Fauna no. 16, 1899, p. 112), and east to Independence Lake, Nevada 
County (Mus. Vert. Zool.) ; casually to Santa Cruz Island (Howell and Van 
Rossem, Condor, xm, 1911, p. 209). The zonal preference of this species in 
California would appear to be Upper Sonoran, though in late summer families 
of adults and young invade high up even into the Canadian zone. This is our 
only hawk which migrates probably wholly out of the state for the winter. There 
is but one winter record, not verified: San Diego (Belding, Land Bds. Pac. Dist., 
1890, p. 36). 
196 (347a) Archibuteo lagopus sancti-johannis (Gmelin) 
AMERICAN ROUGH-LEGGED Hawk 
Synonyms—Archibuteo lagopus; Archibuteo sancti-johannis; St. John 
Black Hawk. 
Status—Sparingly mid-winter visitant to the northern section of the state. 
Reliable records are few; the southernmost appear to be: Berryessa, Santa Clara 
County (Barlow, Condor, u, 1900, p. 131); San Jose (Mus. Vert. Zool.) ; Stock- 
ton, and Big Trees, Calaveras County (Belding, Proc. U. S. Nat. Mus., 1, 1879, p. 
436) ; plains southwest of Fresno (Tyler, Pac. Coast Avif. no. 9, 1913, p. 48) ; 
and Lake Tahoe (Henshaw, Rep. Wheeler Surv., 1877, p. 1320). 
197 (348) Archibuteo ferrugineus (Lichtenstein) 
FERRUGINOUS ROUGH-LEGGED Hawk 
Synonyms—Falco ferrugineus; Buteo californica; Butaetes sancti-johannis ; 
Archibuteo lagopus sancti-johannis, part; Rusty Squirrel Hawk; California 
Squirrel Hawk. : 
Status—Formerly common as a transient and winter visitant to the valleys 
west of the desert divide, from the San Diegan district (several instances, inelud- 
ing a specimen in Mus. Vert. Zool., taken by J. G. Cooper near San Diego), north 
to Cotati, Sonoma County (Mus. Vert. Zool.). and head of Sacramento Valley. 
Has occurred also northeast of the Sierras (Henshaw, Rep. Wheeler Surv., 1879, 
p. 315), and casually on the Farallon Islands (W. E. Bryant, Proc. Calif. Acad. 
Sci., 2nd ser., 1, 1888, p. 45). Now notably searce or altogether wanting in all 
regions from which recent reports have been made. There is one breeding’ rec- 
ord: Consumnes River (Heermann, Pace. R. R. Rep., x, 1859, p. 32), not alto- 
gether trustworthy. 
