Based primarily on the American Ornithologists' Union Checklist of North American Birds, 1957 (5th edition) and 1983 (6th edition), with a few thoughts of my own. All errors should be considered my own.

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Family ACCIPITRIDAE

Subfamily PANDIONINAE: Ospreys

Genus PANDION Savigny

Pandion haliaetus (Linnaeus). OSPREY.

Falco Haliaetus Linnaeus, 1758, Syst. Nat., ed. 10, 1, P. 91. (in Europa = Sweden.)

Pandion haliaetus carolinensis (Gmelin)
Falco carolinensis Gmelin, 1788, Syst. Nat., 1, p. 263; based on "Fishing Hawk" of Catesby, 1729, Nat. Hist. Carolina, pt. 1, p. 2. (South Carolina ex Catesby.)

Pandion haliaetus ridgwayi Maynard
Pandion Ridgweir [sic] Anonymous = C. J. Maynard, 1887, Amer. Exch. and Mart, Household Journ., 3, no. 3, p. 33. (Andros Island.)

Genus LEPTODON Sundevall

Leptodon Sundevall, 1836, Vetensk.-Akad. Handl. (1835), p. 114. Ype by monotypy, "Falco cayanensis et palliatus auct." = Falco cayanensis Latham.

Leptodon cayanensis (Latham). GRAY-HEADED KITE.
Falco cayanensis Latham, 1790, Index Ornithol., 1, p. 28. Baseed on the "Cayenne Falcom" Latham, Gen. Synop. Birds, 1 (1), p. 59. (in Cayana = Bahia, Brazil.)

Leptodon cayanensis cayanensis (Latham)

Genus CHONDROHIERAX Lesson

Chondrohierax Lesson, 1843, Echo Monde Savant, sér. 2, 7, col. 61. Type, by monotypy, Chondrohierax erythrofrons Lesson = Falco uncinatus Temminck.

Chondrohierax uncinatus (Temminck). HOOKED-BILLED KITE.
Falco uncinatus (Illiger MS) Temminck), 1822, Planches Color., livr. 18, pls 103-104. (Rio de Janeiro and Bahia, Brazil = Bahia.)

Chondrohierax uncinatus aquilonis Friedmann
Chondrohierax uncinatus aquilonis Friedmann, 1934, Journ. Washington Acad. Sci., 24, p. 314. (Tamaulipas, Mexico.)

Chondrohierax uncinatus uncinatus (Temminck)
Falco uncinatus "Illiger" Temminck, 1822, Planches Col., livr. 18, pls. 103, 104, 115, and text ("Vicinity of Rio to the north of Brazil and all of Guiana." = Bahia, eastern Brazil.)

Chondrohierax uncinatus mirus Friedmann
Chondrohierax uncinatus mirus Friedmann 1934, Journ. Washington Acad. Sci., 24, p. 313. (Grenada.)

Chondrohierax wilsonii (Cassin). CUBAN KITE.

Cymindis Wilsonii Cassin, 1847, Journ. Acad. Nat. Sci. Philadelphia, n.s., 1, p. 21, pl. 7. (near Gibara, Cuba.)

Genus ELANOIDES Vieillot

Elanoides forficatus (Linnaeus). AMERICAN SWALLOW-TAILED KITE.

Elanoides forficatus forficatus (Linnaeus)

Elanoides forficatus yetapa (Vieillot)
Milvus yetapa Vieillot, 1818, Nouv. Dict. Hist. Nat., nouv. d., vol. 20, p. 564. (Paraguay.)

Genus GAMPSONYX Vigors

Gampsonyx swaisonii Vigors. PEARL KITE.

Gampsonyx swainsonii leonae Chubb
Gampsonyx swainsonii leonae Chubb, 1918, Bull. Brit. Ornith. Club, 39, p. 22. (Len, Nicaragua.)

Genus ELANUS Savigny

Elanus caeruleus (Desfontaines). WHITE-TAILED KITE.

Elanus caeruleus majusculus Bangs and Penard
Elanus leucurus majusculus Bangs and Penard, 1920, Proc. New England Zool. Club, 7, p. 46. (San Rafael, California.)

Genus ROSTRHAMUS Lesson

Rostrhamus sociabilis (Vieillot). SNAIL KITE.

Rostrhamus sociabilis socabilis (Vieillot)
Rostrhamus socialbilis var. plumbeus Ridgway, 1874, in Baird, Brewer and Ridgway, Hist. North Amer. Birds, 3, pp. 208 (in key), p. 209. (Everglades of Florida.)
Rostrhamus sociabilis levis Friedmann, 1933, Paoc. Biol. Soc. Wash., 46, p. 199. (Cuba.)

Rostrhamus sociabilis major Nelson and Goldman
Rostrhamus sociabilis major Nelson and Goldman, 1933, Proc. Biol. Soc. Washington, 46, p. 193. (Catemaco, Vera Cruz, Mexico.)

Rostrhamus hamatus (Temminck). SLENDER-BILLED KITE.

Genus HARPAGUS Vigors

Harpagus bidentatus Latham. DOUBLE-TOOTHED KITE.

Harpagus bidentatus fasciatus (Latham)
Harpagus fasciatus Lawrence, 1869, Proc. Acad. Nat. Sci. Philadelphia (1868). p. 429. (Guatemala.)

Genus ICTINIA Vieillot

Ictinia mississippiensis (Wilson). MISSISSIPPI KITE.

Ictinia plumbea (Gmelin). PLUMBEOUS KITE.

Genus HALIAEETUS Savignoy

Haliaeetus leucocephalus (Linnaeus). BALD EAGLE.

Haliaeetus leucocephalus washingtoniensis (Audubon)
Falco Washingtoniensis Audubon, 1827, Birds Amer., pl. 11 (first state: legend on rock). (near Henderson, Kentucky, fide Audubon, 1831, Ornith. Biogr., 1, p. 60. Migrant.)
Haliaetus leucocephalus alascanus Townsend, 1897, Proc. Biol. Soc. Washington, 11, p. 145. (Unalaska, Aleutian Islands.)

Haliaeetus albicilla (Linnaeus). WHITE-TAILED EAGLE.

Haliaeetus pelagicus (Pallas). STELLER'S SEA-EAGLE.

Genus CIRCUS Lacpde

Circus cyaneus (Linnaeus). NORTHERN HARRIER.

Circus cyaneus hudsonius (Linnaeus)
Falco hudsonius Linnaeus, 1766, Syst. Nat., ed. 12, 1, p. 128, based on "The Ring-tail'd Hawk" of Edwards, 1750, Nat. Hist. Birds, p. 107, pl. 107. (Hudson Bay.)

Genus ACCIPITER Brisson

Accipiter superciliosus (Linnaeus). TINY HAWK.

Accipiter superciliosus fontanieri Bonaparte
Accipiter fontainieri [sic] Bonaparte, 1853, Compt. Rend. Acad. Sci., Paris, 37, p. 810. (no locality. Type from Santa Cruz, Magdalena, Colombia.)

Accipeter striatus Vieillot. SHARP-SHINNED HAWK.

Accipiter striatus perobscurus Snyder
Accipiter striatus perobscurus Snyder, 1938, Occas. Papers Toy. Ontario Mus., Zool., no. 4, p. 4. (TYPE LOCALITY AS IN 5TH EDITION.)

Accipiter striatus velox (Wilson)

Accipiter striatus suttoni van Rossem

Accipiter striatus madrensis Storer
Accipiter striatus suttoni Storer, 1952, Condor, 54, p. 288. (Cuapongo, Guerrero, Mexico.)

Accipiter striatus chionogaster Kaup
Nisus (Accipiter) chionogaster Kaup, 1852, Proc. Zool. Soc. London (1851), p. 41. (Cobn, Guatemala.)

Accipiter striatus striatus Vieillot
Accipiter striatus Vieillot, 1807, Hist. Nat. Oiseaux Amrique Septentrionale, 1, p. 42, pl. 14. (Santo Domingo, Dominican Republic.)

Accipiter striatus fringilloides Vigors
Accipiter fringilloides Vigors, 1827, Zool. Journ., 3, p. 434. (near Havana, Cuba.)

Accipiter striatus venator Wetmore
Accipiter striatus venator Wetmore, 1914, Proc. Biol. Soc. Washington, 27, p. 119. ( Maricao, Puerto Rico.)

Accipiter bicolor (Vieillot). BICOLORED HAWK.

Accipeter bicolor bicolor (Vieillot)

Accipiter bicolor fidens Bangs and Noble
Accipiter bicolor fidens Bangs and Noble, 1918, Auk, 35, p. 444. (Buena Vista, Vera Cruz.)

Accipiter cooperii (Bonaparte). COOPER'S HAWK.

Accipiter gundlachi Lawrence. GUNDLACH'S HAWK.

Accipiter gundlachi gundlachi Laurence

Accipiter gundlachi wileyi Wotzkow
Accipiter gundlachi wileyi Wotzkow, 1988, Garciana, 9, p. 2. (eastern Cuba)

Accipiter gentilis (Linnaeus). NORTHERN GOSHAWK.

Accipiter gentilis atricapillus (Wilson)

Accipiter gentilis apache van Rossem
Accipiter gentilis apache van Rossem, 1938, Proc. Biol. Soc. Washington, 51, p. 99. (Cochise County, Arizona.)

Accipiter gentilis laingi (Taverner)
Astur atricapillus laingi Taverner, 1940, Condor, 42, p. 160. (Massett, Queen Charlotte Islands.

Genus GERANOSPIZA Kaup

Geranospiza caerulescens (Vieillot). CRANE HAWK.

Geranospiza caerulescens nigra (Du Bus de Gisignies)
Ischnosceles niger Du Bus de Gisignies, 1847, Bull. Acad. Roy. Sci. Lettres Beaux-Arts Belgique, 14, pt. 2, p. 102. (Mexico.)
Geranospiza caerulescens livens Bangs and Penard, 1921, Proc. Biol. Soc. Washington, 34, p. 89. (Alamos, Sonora.)

Geranospiza ccaerulescens balzarensis Sclater
Geranospiza niger balzarensis W. L. Sclater, 1918, Bull. Brit. Ornith. Club. 38, p. 45. (Balzar Mountains, Ecuador.)

Genus LEUCOPTERNIS Kaup

Leucopternis plumbea Salvin. PLUMBEOUS HAWK.

Leucopternis princips Sclater. BARRED HAWK.

Leucopternis semiplumbea Lawrence. SEMIPLUMBEOUS HAWK.

Leucopternis albicollis (Latham). WHITE HAWK.

Leucopternis albicolis ghiesbreghti Du Bus
Leucopternis albicolis ghiesbreghti Du Bus de Gisignies, 1845, Esquuisses Ornith., livr. 1, pl. 1, and text. (Hacienda de Mirador, Vera Cruz, Mexico.)

Leucopternis albicolis costaricensis Sclater
Leucopternis ghiesbreghti costaricensis W. L. Sclater, 1919, Bull. Brit. Ornith. Club, 39, p. 76. (Carillo, Costa Rica.)

Genus BUTEOGALLUS Lesson

Buteogallus anthracinus (Deppe). COMMON BLACK-HAWK.

Urubtinga anthracina cancrivora Clark, 1905, Proc. Biol. Soc. Washington, 18, p. 63. (St. Vincent Island, Lesser Antilles.)
Buteogallus anthracinus micronyx van Rossem and Hachisuka, 1937, Trans. San Diego Soc. Nat. Hist., 8, p. 361. (Arivaipa Creek, Arizona.)
Buteogallus anthracinus utilensis Twomey, 1956, Ann. Carnegie. Mus., 33, p. 387. (Utila Island, Honduras.)

Buteogallus gundlachii (Cabanis). CUBAN BLACK-HAWK.

Hypomorphnus Gundlachii Cabanis, 1855, Journ. Ornith., 2(1854), Erinnerungsschrift, p. 80. (Cuba.)

Buteogallus subtillis (Thayer and Bangs). MANGROVE BLACK-HAWK.

Buteogallus subtilis bangsi (Swann)
Urubitinga anthracina bangsi Swann, 1922, Synop. Accipitres,ed. 2, p. 98. (San Miguel Island = Isla del Rey, Pearl Islands.)
Buteogallus subtillis rhizophorae Monroe, 1963, Occas. Papers Mus. Zool., Louisiana State Univ., no. 26, p.1. (San Lorenzo, Valle, Honduras.)

Buteogallus urubitinga (Gmelin). GREAT BLACK-HAWK.

Buteogallus urubitinga ridgwayi Gurney
Urbutinga ridgwayi Gurney, 1884, List Diurnal Birds Prey, p. 148. (Guatemala.)

Buteogallus urubitinga urubitinga

Buteogallus meridionalis (Latham). SAVANNA HAWK.

Buteogallus meridionalis meridionalis
Buteogallus meridionalis rufulus (Vieillot)
Circus rufulus Vieillot, 1816, Nouv. Dict. Hist. Nat., nouv. d., vol. 4, p. 466. (based on Gavilan del Estero avanelado Azara; near city of Corrientes.)
Heterospizias meridionalis australis Swann, 1921, Auk, vol. 38, p. 359. (Laguna de Malima, Tucuman, Argentina.)]

Genus PARABUTEO Ridgway

Parabuteo unicinctus (Temminck). HARRIS' HAWK.

Parabuteo unicinctus harrisi (Audubon)
Parabuteo unicictus superior van Rossem cit. See fifth edition.

Genus BUSARELLUS Lesson

Busarellus nigricollis (Latham). BLACK-COLLARED HAWK.

Busarellus nigricollis nigricollis (Latham)

Genus HARPYHALIAETUS Lagresnaye

Harpyhaliaetus solitarius (Tschudi). SOLITARY EAGLE.

Harpyhaliaetus solitarius sheffleri (van Rossem)
Urubitornis solitarius sheffleri van Rossem, 1948, Proc. Biol. Soc. Washington, 61, p. 67. (extreme southeastern Sonora, Mexico.)

Genus BUTEO Lacepede

Buteo nitidus (Latham). GRAY HAWK.

Buteo magnirostris (Gmelin). ROADSIDE HAWK.

Buteo magnirostris griseocauda (Ridgway)
Buteo (Rupornis) magnirostris var. griseocouda Ridgway, 1873, Proc. Boston Soc. Nat. Hist., 16, pp. 87 (in key) 88. (Mexico. Cotypes from Oaxaca.)
Buteo magnirostris conspectus (Peters)Rupornis magnirostris conspecta Peters, 1913, Auk, 30, p. 370. (San Ignacio, Yucatn.)
Rupornis magnirostris argutus Peters and Griscom, 1929, Proc. New England Zool. Club, 11, p. 46. (Almirante, northwestern Panama.)
Rupornis magnirostris direptor Peters and Griscom, 1929, Proc. New England Zool. Club, 11, p. 46. (near Mazatenango, Guatemala.)
Buteo magnirostris xantusi van Rossem, 1939, Ann. Mag. Nat. Hist., ser. 11, 4, p. 440. (Colima Mexxico.)
Buteo magnirostris petersi Brodkorb, 1940, Occas. Papers Mus. Zool., Univ. Michigan, no. 425, p. 2. (Chiapas, Mexico.)

Buteo magnirostris gracilis (Ridgway)
Rupornis gracilis Ridgway, 1885, Proc. U S. Nat. Mus., 8, p. 94. (Cozumel Island.)

Buteo magnirostris sinushonduri Bond
Buteo magnirostris sinus-honduri Bond, 1936, Proc. Acad. Nat. Sci. Philadelphia, 88, p. 355. (Bonacca Island, Gulf of Honduras.)

Buteo magnirostris petulans van Rossem
Asturina ruficauda P. L. Sclater and Salvin, 1869, Proc. Zool. Soc. London, P. 133. (type from Lion Hill, Panama.)
Buteo magnirostris petulans vam Rossem, 1935, Condor, 37, p. 215. (New name for Asturina ruficauda P. L. Sclater adn Salvin,1869, preoccupied by Buteo ruficaudus Vieillot, 1807, Hist.Nat.Oiseaux Amrique Septentrionale, 1, p. 43, pl. 14 bis.)

Buteo magnirostris alius (Peters and Griscom)
Rupornis magnirostris alia Peters and Griscom, 1929, Proc. New England Zool. Club, 11, p. 48. (San Miguel, El Rey, Pearl Islands, Panama.)

Buteo lineatus (Gmelin). RED-SHOULDERED HAWK.

Buteo lineatus elegans Cassin

Buteo lineatus lineatus (Gmelin)

Buteo lineatus texanus Bishop

Buteo lineatus alleni Ridgway

Buteo lineatus extimus Bangs

Buteo ridgwayi (Cory). RIDGWAY'S HAWK.

Buteo brachyurus Vieillot. SHORT-TAILED HAWK.

Buteo brachyurus fuliginosus Sclater
Buteo brachyurus fuliginosus P. L. Sclater, 1858, Proc. Zool. Soc. London, p. 356. (Tamaulipas, Mexico.)

Buteo swainsoni Bonaparte. SWAINSON'S HAWK.

Buteo alvicaudatus Vieillot. WHITE-TAILED HAWK.

Buteo albicaudatus hypospodius Gurney
Buteo hypospodius Gurney, 1876, Ibis, p. 73, pl. 3. (Medelln, Columbia, and Mrida, Venezuuela.)

Buteo albonotatus Kaup. ZONE-TAILED HAWK.

Buteo solitatius Peale. HAWAIIAN HAWK.

Buteo jamaicenses (Gmelin). RED-TAILED HAWK.

Buteo regalis Gray. FERRUGINOUS HAWK.

Buteo lagopus (Pontoppidan). ROUGH-LEGGED HAWK.

Buteo lagopus sanctijohannis (Gmelin).
Falco S. Johannis Gmelin, 1788, Syst. Nat., 1, p. 273; based on "S. John's Falcon" of Latham, 1781, General Synop. Birds, 1, p. 77, and Pennant, 1785, Arctic Zool., P. 200, pl. 9. (Hudson Strait and Newfoundland.)

Genus MORPHNUS Dumont

Morphnus guianensis (Daudin). CRESTED EAGLE.

Genus HARPIA Vieillot

Harpia harpyja (Linnaeus). HARPY EAGLE.

Genus AQUILA Brisson

Aquila chrysaetos (Linnaeus). GOLDEN EAGLE.

Aquila chrysaetos canadensis (Linnaeus)

Genus SPIZASTUR Gray

Spizastur melanoleucus (Vieillot). BLACK-AND-WHITE HAWK-EAGLE.

Genus SPIZAETUS Vieillot

Spizaetus tyrannus (Wied). BLACK HAWK-EAGLE.

Spizaetus tyrannus serus Friedmann
Spizaetus tyrannus serus Friedmann, 1950, Smithsonian Misc. Coll., 111, no. 16, p. 1. (Ro Indio, Canal Zone, Panama.)

Spizaetus ornatus (Daudin). ORNATE HAWK-EAGLE.

Spizaetus ornatus vicarius Friedmann
Spizaetus ornatus vicarius Friedmann, 1935, Journ. Washington Acad. Sci., 25, p. 451. (Manatol [= Manatee] Lagoon, British Honduras.)

Suborder FALCONES: Caracaras and Falcons

Family FALCONIDAE: Caracaras and Falcons

Subfamily CARACARINAE: Caracaras, Laughing Falcons and Forest Falcons

Tribe CARACARINI: Caracaras

Genus DAPTRIUS Vieillot

Daptrius americanus (Boddaert). RED-THROATED CARACARA.

Genus CARACARA Merrem

Caracara plancus (Miller). CRESTED CARACARA.

Caracara plancus cheriway (Jacquin)
Falco cheriway Jacquin, 1784, Beytr. Geschichte Vgel, p. 17, pl. 4. (Aruba Island, Lesser Antiilles.)
Polyborus cheriway pallidus Nelson, 1898, Proc. Biol. soc. Washington, 12, p. 8. (Mara Madre Island, off Western Mexico.)

Genus MILVAGO Spix

Milvago chimachima (Vieillot). YELLOW-HEADED CARACARA.

Milvago chimachima cordatus Bangs and Penard
Milvago chimachima cordatus Bangs and Penard, 1918, Bull. Mus. Comp. Zool., 62, p. 35. (San Miguel, Pearl Islands, Panama.)
Milvago chimachima paludivaga Penard, 1923, Proc. New England Zool. Club., 8, p. 36. (Paramaribo, Surinam.)

Tribe HERPETOTHERINI: Laughing Falcons

Genus HERPETOTHERES Vieillot

Herpetotheres cachinnans (Linnaeus). LAUGHING FALCON.

Herpetotheres cachinnans fulvescans Chapman, 1915, Bull. Amer. Mus. Nat. Hist., 34, p. 638. (Alta Bonita, western slope of Andes, Antioquia, Columbia, alt. 1500 ft.)
Herpetotheres cachinnans chapmani Bangs and Penard, 1918, Bull.Mus. Comp. Zool., 62, p. 37. (Quintana Roo, Mexico.)
Herpetotheres cachinnans queribundus Bangs and Penard, 1919, Bull. Mus. Comp. Zool., 63, p. 23. (Pernambuco, Brazil.)
Herpetotheres cachinnans excubitor van Rossem, 1938, Trans. San Diego Soc. Nat. Hist., 9, p. 10. (Volcn de Colina, Jalisco,Mexico.)

Tribe MICRASTURINI: Forest-Falcons

Genus MICRASTUR Gray

Micrastur ruficollis (Vieillot). BARRED FOREST-FALCON.

Micrastur ruficollis guerilla Cassin
Micrastur guerilla Cassin, 1848, Proc. Acad. Nat. Sci. Philadelphia, 4, p. 87. (near Jalapa, Vera Cruz, Mexico.)
Micrastur ruficollis oaxacae Phillips, 1966, Bull. Brit. Ornith. Club, 86, p. 91. (southwestern Oaxaca, Mexico.)

Micrastur rufficollis interstes Bangs
Micrastur interstes Bangs, 1907, Auk, 24, p. 289. (La Estrella de Cartago.)

Micrastur mirandollei (Schlegel). SLATY-BACKED FOREST-FALCON.
Micrastur mirandollei extimus Griscom and Greenway, 1937, Bull. Mus. Comp. Zool., 81, p. 418. (Perm, Panama.)

Micrastur semitorquatus (Vieillot). COLLARED FOREST-FALCON.

Micrastur semitorquatus naso (Lesson)
Carnifex naso Lesson, 1842, cho Monde Savant, 9, col. 1085. (Realejo, Nicaragua.)

Subfamily FALCONINAE: True Falcons.

Tribe FALCONINI: True Falcons.

Genus FALCO Linnaeus

Falco tinnunculus Linnaeus. EURASIAN KESTREL.

Falco tinnunculus tinnunculus Linnaeus

Falco tinnunculus interstinctus McClelland
Falco interstictus McClelland, 1840, Proc. Zool. Soc. London. (1839), p. 154. (Assam, India.)

Falco sparverius Linnaeus. AMERICAN KESTRAL.

Falco columbarius Linnaeus. MERLIN.

Falco columbarius suckleyi Ridgway
Falco columbarius var. suckleyi Ridgway, 1873, Bull. Essex Inst., Salem, Mass., 5, P. 201. (Shoalwater Bay adn Fort Steilacoom, Washington.)

Falco columbarius columbarius Linnaeus
Falco columbarius bendirei Swann, 1922, Bull. Brit. Orn. Club, 42, p. 66. (Fort Walla Walla, Washington.)

Falco columbarius richardsonii Ridgway
Falco (Hypotriorchis) richardsonii Ridgway, 1871, Proc. Acad. Nat. Sci. Philadelphia (1870), p. 145. (mouth of Vermillion River, South Dakota.)

Falco femoralis Temminck. APLOMADO FALCON.

Falco femoralis septentrionalis Todd
Falco fusco-caerulescens septentrionalis Todd, 1916, Proc. Biol. Soc. Washington, 29, p. 98. (Fort Huachuca, Arizona.)

Falco femoralis femoralis Temmenck

Falco rufigularis Daudin. BAT FALCON.

Falco rufigularis petoensis Chubb
Falco rufigularis petoensis Chubb, 1918, Bull. Brit. Ornith. Club, 39, p. 22. (Peto, Yucatan, Mexico.)

Falco deiroleucus Temminck. ORANGE-BREASTED FALCON.

Falco peregrinus Tunstall. PEREGRINE FALCON.

Falco peregrinus tundrius White
Falco peregrinus tundrius White, 1968, Auk, 85, p. 183. (Adelaide Peninsula, Northwest Territories, Canada.)

Falco peregrinus anatum Bonaparte

Falco peregrinus pealei Ridgway
Falco communis var. Pealei Ridgway, 1873, Bull. Essex Inst., Salem, Mass., 5, p. 201. (northwest coast of North America from Sitka to Oregon.)

Falco rusticolus Linnaeus. GYRFALCON.

Falco rusticolis candicans Gmelin
Falco candicans Gmelin, 1788, Syst. Nat., 1, p. 275; based on "White Jerfalcon" of Latham, 1781, General Synop. Birds, 1, p. 83, and "Gerfalcon" of Pennant, 1785, Arctic Zool., p. 221. (Islandia at Scotia boreali" = Greenland, fide Hartert, 913, Vgel Pal. Fauna, p. 1064.)
Falco rusticolis obsoletus Gmelin
Falco obsoletus Gmelin, 1788, Syst. Nat., 1, p. 268; based on "Plain Falcon" of Pennant, 1785, Arctic Zool., p. 208. (Hudson Bay.)
Falco rusticolis islandus Brnnich
Falco Islandus Brnnich, 1764, Ornith. Borealis, p. 2. (Iceland.)

Falco mexicanus Schlegel. PRAIRIE FALCON.

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