362 BULLETIN 50, UNITED STATES NATIONAL MUSEUM 



Santa Efigenia, and Tehuantepec City, Oaxaca, Oct.- Jan.; food). — Gurnet, 

 Ibis, 1876, 483; List Diurn. Birds Prey, 1884, 74, part; Cat. Birds Prey, 

 1894, 25, part. — Boucard, Proc. Zool. Soc. London, 1883, 456 (Yucatdn). — 

 American Ornithologists' Union, Check-list, 1886, and ed. 2, 1895, No, 

 346, part; ed. 3, 1910, p. 160, part. — Ridgway, Man. North Amer. Birds, 

 1887, 240, part. — Bendire, Life Hist. North Amer. Birds, i, 1892, 251, pi. 

 7, fig. 7, part. — Fisher, Hawks and Owls United States, 1893, 85, part. — 

 Salvin and Godman, Biol. Centr.-Amer., Aves, iii, 1900, 74, part (states of 

 Tamaulipas, Veracruz, Puebla, Mexico, Jalisco, Colima, Oaxaca, Chiapas, 

 and Yucatdn, Mexico).— Cole, Bull. Mus. Comp. Zool., 1, 1906, 121 (Chichen 

 Itzd,, Yucatdn). — Phillips, Auk, xxviii, 1911, 73 (Altamira, Rio Martinez, 

 Santa Leonora, and Rio Cruz, Tamaulipas). — Reichenow, Die Vogel, i, 

 1913, 380.— SwANN, Synopt. List Accip., pt. 2, 1919, 55, part. 



Astur plagiatus Gray, Hand-list, i, 1869, 30, ISo. 282, part. 



Buteo iAsturina) nitida b. var. plagiata Ridgway, Proc. Boston Soc. Nat. Hist., 

 xvi, 1873, 64, part (Tehuantepec, Oaxaca). 



Asturina nitida plagiata Peters, Check-List Birds of World, i, 1931, 240, part.— 

 Davis, Condor, xlvi, 1944, 10 (Guerrero, Mexico). 



Buteo mtidus plagiatus Blake and Hanson, Publ. Field Mus. Nat. Hist., zool. 

 ser., xxii, No. 9, 1942, 526 (Michoacan; Apatzmgan; spec), 



Asturina plagiata plagiata Miller and Griscom, Amer. Mus. Nov., No. 28, 1921, 

 4, part (Mexico). — Swann, Synop. Accip., ed. 2, 1922, 90, part; Monogr. 

 Birds Prey, i, 1930, 435, part (monogr.).— Griscom, Amer. Mus. Nov., No. 

 235, 1926, 12 (e. Quintana Roo, Yucatdn). — McLellan, Proc. California 

 Acad. Sci., ser. 4, xvi, 1927, 20 (Labrados, Mexico; plumage; meas.).' — 

 Bangs and Peters, Bull. Mus. Comp. Zool., Ixviii, 1928, 388 (Chivela and 

 Tapanatipec, Oaxaca, Mexico). — Austin, Bull, Mus. Comp. Zool., Ixix, 



1929, 373 (Belize River, British Honduras). — van Rossem, Condor, xxxii, 



1930, 303 (crit.; distr.). — Amadon and Phillips, Auk, Ivi, 1939, 183 (nestling 

 and juvenal plumages). — del Campo, Anal. Inst. Biol., xiii, 1942, 701 (Chi- 

 apas; Escuintla; spec.).— Sutton and Pettingill, Auk, lix, 1942, 9 (G6mez 

 Farias, w. Tamauhpas; spec). — American Ornithologists' Union, Auk, 

 Ixi, 1944, 445 (nomencl.).— Hill, Auk, Ixi, 1944, 230 (meas.; sex dimorphism). 



BUTEO NITIDUS MAXIMUS (van Rossem) 



Sonora Gray Hawk 



Adult male. — Similar to that of Buteo nitidus plagiatus but larger, 

 the rectrices with oiily one complete white bar and an incomplete 

 second one. 



Adult female. — Similar to that of Buteo nitidus plagiatus but larger 

 and with the tail character as in the male (above). 



Juvenal (sexes alike). — Very similar to that of Buteo nitidus plagiatus, 

 but averaging slightly larger, and paler, the upperparts varying from 

 Front's brown to Saccardo's umber mottled with light pinkish buflF. 



Natal dovM. — White, tinged with pale gray on lower back. 



Adult male.—Wmg 250.5-272 (259); taU 151-187 (173.5); culmen 

 from cere 20-24.5 (21.5); tarsus 69-75 (72.8); middle toe without 

 claw 34-41.5 (36.8 mm.).^^ 



88 Sixteen specimens; 12 summer birds from Arizona, Sinaloa, and northern 

 Tamaulipas; 4 wintering birds from Guerrero, Colima, and Oaxaca. 



