648 BULLETIN 50, UNITED STATES NATIONAL MUSEUM 



Hierofalco'^ Falco candicans Pleske, Mem. Boston Soc. Nat. Hist., vi, 1928, 302, 

 in part (n. Urals; Kara River; nests; Chubukulach River; Chuckche Penin- 

 sula; and Ikauria, Siberia). 



Falco rusticolus candicans Stegmann, Joiirn. fiir Orn., Ixxviii, 1930, 435 (Amur- 

 land). — Yamashina, Journ. fiir Orn., Ixxix, 1931, 515 (Kurile Island). — 

 Belopolski, Journ. fur Orn., Ixxxi, 1933, 421 (Anadyr region). 



Hierojalco uralensis Severtzov and Menzbier, Orn. Geogr. Eur. Russia, 1882, 

 i, 288, pi. 3 (Ural Mts.); Journ. fur Orn., xi, 1883, 413 (transl. of orig. descr.). 



Faho rusticolus uralensis Hartert, Vog. pal. Fauna, ii, 1913, 1069 (monogr.). — 

 KoELz, Wils. Bull., xli, 1929, 208, in text (distr.; crit.). — Stegmann, Journ. 

 fur Orn., Ixxviii, 1930, 435 (Amurland); Ixxix, 1931, 214 (distr.; Siberian- 

 Manchurian border); Faune U. R. S. S., Oiseaux, i. No. 5, Falcon if ormes, 

 1937, 56, 265 (crit.; distr.; descr.). — American Ornithologists' Union, 

 ed. 4, 1931, 74.— Peters, Check-list Birds of World, i, 1931, 286.— Swarth, 

 Pacific Coast Avif., No. 22, 1934, 25, in text (crit.). — Taverner, Birds Can- 

 ada, 1934, 144, in text (Canada; distr.). — Friedm.'^nn, Bull. Chicago Acad. 

 Sci., V, No. 3, 1935, 30 (Kodiak Island; spec); Auk, Iv, 1938, 290, in text 

 (crit.; distr.). — Munro, Condor, xxxviii, 1936, 172, in text (Okanagan Valley, 

 Brit. Columbia; spec); Can. Journ. Res., D, xxiii, 1945, 56 (Cariboo Park- 

 lands, Brit. Columbia).— Bent, U. S. Nat. Mus. Bull. 170, 1938, 15 (life 

 hist.). — Bailey, Proc Colorado Mus. Nat. Hist., xviii, No. 1, 1943, 90 (Cape 

 Prince of Wales, Alaska; 2 specs.). — Brandt, Alaska Bird Trails, 1943, 

 359 (Hooper Bay region, Alaska; rare; 2 seen). — Todd and Friedmann, 

 Wils. Bull., lix, 1947, 144, in text (Bering Sea coast, s. in winter to Wash- 

 ington). 



Hierojalco grehnitzkii Severtzow, Nouv. M6m. Soc. Imp. Nat. Moscou, xv, livr. 

 3, 1885, 69 (Bering Island; Kamchatka). — Dementieff, Alauda, ser. 2, ill. 

 1931, 502 (crit.). 



Falco gyrfalco grehnitzkii Bergman, Kenntn. Nordostasiat. Vog., 1935, 92, in text. 



Falco rusticolus grehnitzkii Stegmann, Faune U. R. S. S., Oiseaux, ii, No. 5, 

 Falconif ormes, 1937, 265 (crit.; distr.; descr.). — Friedmann, Auk, Iv, 1938, 

 290, in text (crit.; distr.). 



Falco rusticolus (not of Linnaeus, 1758) Stejneger, U. S. Nat. Mus. Bull. 29, 

 1885, 202 (Bering Island; Kamchatka; syn.); Auk, ii, 1885, 188, part 

 (nomencL). 



Falco islandus Stejneger, U. S. Nat. Mus. Bull. 29, 1885, 204 (Bering Island; 

 Kamchatka; syn.). 



Falco rusticolus alascanus Swann, Bull. Brit. Orn. Club, xlii, 1922, 67 (Norton 

 Bay [ = Sound] Alaska). — Hartert, Vog. pal. Fauna, Nachtr., i, 1923, 70 

 (crit.). — Oberholser, Auk, xli, 1924, 593 (syn.). — Koelz, Wils. Bull., xli, 

 1929, 208, in text (distr.; crit.).— Swarth, Pacific Coast Avif., No. 22, 1934, 

 25, in text (crit.). — Friedmann, Chicago Acad. Sci. Bull. 5, No. 3, 1935, 30 

 (syn.). 



Hierojalco rusticolus alascanus Oberholser, Auk, xl, 1923, 680 (Alaska). 



Subgenus Rhynchodon Nitzsch 



Rather large, compactly built falcons (wing about 285-375 mm. in 

 American species) ^' with much less than upper half of tarsus feathered 

 in front, outer toe (without claw) extending to considerably beyond 



3^ One Old World species {F. minor Bonaparte) sometimes has wing as short as 

 231 mm. 



