BIRDS OF NORTH AND MIDDLE AMERICA 257 



158.— SwARTH, Univ. California Publ. Zool., vii, 1911, 61 (Duke of York 

 Island and Chickamun River, Alaska). — Swann, Synopt. List Accip., pt. 

 2, 1919, 48; Synop. Accip., ed. 2, 1922, 78; Monogr. Birds Prey, i, 1926, 

 395 (monogr.). — Ridgway, Auk, xl, 1923, 325, in text. — Taverner, Birds 

 Western Canada, 1926, 193, in text; Victoria Mem. Mus. Bull. 48, 1927, 3 

 (crit.; tax.); Auk, liii, 1936, 360, in text (crit.) ; Condor, xxxviii, 1936, 69, 

 71, in text (crit.; color). — Bailey, Auk, xliv, 1927, 203 (Big John Bay, Keka 

 Strait, Mad Bay, Chickagof Island, etc., se. Alaska). — Gumming, Murrelet, 

 xii, 1931, 16 (Queen Charlotte Islands, British Columbia; spec). — Huey, 

 Condor, xl, 1938, 106, in text (Alaska; Glacier Bay; type spec). 



Buteo jamaicensis alascensis Peters, Check-list Birds of World, i, 1931, 231 

 (distr.). — HoussE, El Hornero, viii, 1941, 47, in text (se. Alaska; on map). — 

 American Ornithologists' Union, Auk, Ixi, 1944, 445. 



(?) Buteo rufescentior Salvin and Godman, Biol. Centr. Amer.; Aves, iii, sig. 

 8, Nov. 1900, 63, in text, part (Sitka).— Griscom, Auk, xxxix, 1922, 107, 

 part (query as to identity). — Ridgway, Auk, xl, 1923, 325, part (crit.). 



Buteo borealis subsp? Brooks, Auk, xl, 1923, 221 (Porcher Island, Brit. Colum- 

 bia). 



Buteo borealis Shortt, Contr. Roy. Ontario Mus. Zool., No. 17, 1939, 11 (Yaku- 

 tat Bay, Alaska; 1 record). 



BUTEO JAMAICENSIS KRIDERII Hoopes 



Krider's Hawk 



Adult (sexes alike) . — Similar to that of Buteo jamaicensis borealis, 

 but with the upperparts generally, especially the top of the head, nape, 

 back, upper wing coverts, and upper tail coverts, very much and 

 noticeably streaked, spotted, or otherwise marked, with white, the 

 white on the interscpaulars washed with pale tawny; the upperparts 

 with little reddish brown ; in extremely light colored birds the top and 

 sides of the head may be practically pure white; underparts much 

 whiter, less marked with brownish than any of the other races of the 

 species, sometimes immaculate white; thighs usually, but not always, 

 immaculate; tail variable— pure white subterminally barred with 

 fuscous-black and with several small, incomplete bars of the same along 

 the shaft, or with a single mikado brown subterminal band; or pale 

 avellaneous to sayal brown, tipped with white, subterminally banded 

 with fuscous-brown, with or without additional similar but narrower 

 bars on the rest of the length of the rectrices. 



The males average paler than females, but the difference is not con- 

 stant. 



Juvenal (sexes alike). — Similar to that of Buteo jamaicensis borealis, 

 but with the entire upperparts abundantly spotted and streaked with 

 white (the feathers of the crown, nape, and interscapulars broadly 

 edged laterally with white; the scapulars, upper wing coverts, back, 

 rump, and upper tail coverts broadly barred and tipped and narrowly 

 edged with wliite) ; underparts averaging less abundantly marked with 

 fuscous; rectrices barred as in juvenal borealis, but the pale color vari- 

 able — deep olive-buff, wood brown, hair brown, or deep grayish oUve. 



