276 BULLETIN 50, UNITED STATES NATIONAL MUSEUM 



Adult female.— Wing 409-438 (419.6); tail 224.6-234.5 (228.9); 

 culmen from cere 24.5-25 (24.6); tarsus 73.1-77.5 (74.5); middle toe 

 without claw 42.4-48 (45.7 mm.).^® 



Range. — Breeds from southern Texas (Guadaloupe Alountains; 

 Davis Mountains; Devils River; Fredericksburg; Comal, Kendall, 

 Tom Green, and Concho Counties); southwestern New Mexico 

 (Apache; Lincoln County; Grant County; Hidalgo County; Gila 

 River), southern Arizona (Tucson; New River; Huachuca Moun- 

 tains; Rincon Mountains; Santa Rita Mountains; Santa Catalina 

 Mountains; north to mouth of Bill Williams River, Big Sandy River, 

 Camp Verde, and Graham Mountains; west to Baboquivari Moun- 

 tains) and northern Baja California (San Pedro Martir district south- 

 ward); south throughout Mexico; and, chiefly in the highlands, to 

 Guatemala (Oc6s); Nicaragua (the pine forests of the north central 

 highlands); Costa Rica (where apparently very rare); and eastern 

 Panama (Perme, in the tropical lowlands). Not definitely known 

 to breed in either Costa Rica or Panama. 



Winters throughout most of its range but appears to go south of 

 Arizona (except along the lower Colorado River), New Mexico, and 

 Texas; also reported (rarely) from southern California (San Diego 

 County) . 



Type locality. — Mexico. 



Buteo albonotahis Gray, List Spec. Brit. Mus., pt. 1, Accip., 1844, 17; ed. 2, 1848, 

 36 (Mexico; nomen nudum!); Handlist Birds, 1869, 8, No. 63 (Mexico). — 

 Kaup, Isis, 1847, 369 (first descr.) ; in Jardine's Contr. Orn., 1850, 75. — 

 Strickland, Orn. Syn., i, 1855, 31. — Sclater and Salvin, Ibis, 1859, 

 217 (Guatemala; food). — Sclater, Proc. Zool. Soc. London, 1860, 253 

 (Veracruz, Mexico). — Frantzius, Journ. fur Orn., xvii, 1869, 368 (Costa 

 Rica). — Salvin, Ibis, 1873, 428 (Guatemala). — Lawrence, Mem. Boston 

 Soc. Nat. Hist., ii, 1874, 302 (Mazatldn, Sinaloa; habits). — Swann, Auk, 

 xxxviii, 1921, 360, in text (crit.). — American Ornithologists' Union, 

 Check-list, ed. 4, 1931, 68 (distr.).— Huey, Condor, xxxv, 1933, 126, in text 

 (Chula Vista, Calif. ; spec.).— Willett, Pacific Coast Avif., No. 21, 1933, 43 (sw. 

 California; rare fall and winter straggler; syn.). — Gilman, Condor, xxxvii, 

 1935, 240, in text (Death Valley, Calif.; 1 rec). — van Rossem, Trans. San 

 Diego Soc. Nat. Hist., viii, 1936, 127 (se. Arizona; Arivaca; nesting in 

 Baboquivari Mountains; distr.). — Bent, U. S. Nat. Mus. Bull. 167, 1937, 

 212 (life hist.). — van Tyne and Sutton, Misc. Publ. Mus. Zool. Univ. 

 Michigan, No. 37, 1937, 22 (Brewster County, Tex.; records; head colors; 

 meas.). — Monson, Condor, xxxix, 1937, 254, in text (Graham County, 

 Ariz.; 3 records). — Sutton and Burleigh, Occas. Pap. Mus. Zool., Louisiana 

 State Univ., No. 3, 1939, 26 (ne. Mexico; Saltillo, Coahuila). — Burleigh 

 and LowERY, Occ. Pap. Mus. Zool. Louisiana State Univ., No. 8, 1940, 97 

 (w. Texas; Guadalupe Mountains). — Huey, Trans. San Diego Soc. Nat. Hist., 

 ix, 1942, 364 (Organ Pipe Cactus National Monument, Ariz.; 2 seen). — 

 Grinnell and Miller, Pacific Coast Avif. No. 27, 1944, 103 (California; 

 rare fall and winter vagrant). — Hill, Auk, Ixi, 1944, 230 (meas., sex dimor- 



2' Nine specimens from Texas, Arizona, and Mexico. 



