212 BULLETIN 5 0, UNITED STATES NATIONAL MUSEUM 



Archibutes (emendation) Agassiz, Nomencl. Zool., Aves, 1842, 6. 



Triorchis (not Triorches Leach, 1816) Kaup, Skizz. Entew.-Gesch. Eur. Thierw. 



1829, 84, 190. (Tj'pe, by monotypy, Falco lagopus Briinnich.) 

 Triorches (emendation; not of Leach, 1816) Blasius, List Birds Europe, 1862, 4. 

 Butaetes Lesson, Traits d'Orn., 1830, 83. (Type, by monotypy, B. buteo Lesson = 



Falco lagopus Briinnich.) 

 Busaetes (emendation) Lesson, Traits d'Orn., 1831, 652. 

 Cerchne Morris, in N. Wood's Naturalist, il, 1837, 123. (Type, C. pennipes 



MoThs = Falco lagopus Briinnich and C. buteo — Falco buteo Linnaeus.) 

 Lagopus (lapsus for Archibuteo; not of Brisson, 1760) Eraser, Proc. Zool. Soc. 



London, 1844, 37. 

 Hemiastus Gray, Cat. Gen. and Subgen. Birds, 1855, 3 (ex Hodgson, in Gray's 



Zool. Misc., 1844, 81 = nomen nudum). (Type, by original designation, 



Butaquila strophiata Hodgson.) 

 Hemiaetos (emendation) Gray, Cat. Gen. and Subgen. Birds, 1885, 134. 

 Hemiaetos (emendation) Gray, Cat. Mam. and Birds Nepal and Thibet, 1846, 



39, in synonymy of "Archibuteo strophiatus ." 

 Brewsteria Maynard, Birds Eastern North Amer., ed. 2, pt. 40, 1896, 691. (Type, 



by original designation, Falco ferrugineus Lichtenstein.) 

 Rupornis Kaup, Classif. Saugeth. und Vogel, 1844, 120. (Type, by monotypy, 



Falco magnirostris Gmelin.) 

 Rypornis (emendation) Agassiz, Nom. Zool., 1845, Aves add., 20. 

 Rhypornis (emendation) Agassiz, Index Zool., 1846, 326, 328. 

 Potamolegus Bertoni, Aves Nuevas Paraguay, 1901, 158. (Types, P. super- 



ciliaris Bertoni = ^siwnno nattereri Sclater and Salvin, and P. s. magniplumis 



Bertoni = .i4siurma pucherani Sclater and Salvin; see Peters, Check-List 



Birds of World, i, 1931, 228, in this connection.) 

 Coryornis Ridgway, Auk, xlii, 1925, 585. (Type, by original designation and 



monotypy, Rupornis ridgwayi Cory.) 

 Geranoaetus Kaup, Class. Saugeth. und Vogel, 1844, 122. (Type, bj' monotypy 



Falco aguia Temm'mck = Spizaetus melanoleucus Vieillot.) 

 Praedo (not of Nelson, 1912) Kleinschmidt, Falco, xiii, 1917, 10. (Type, by 



original designation, Mausebussard = /'^aZco buteo Linnaeus.) 

 Percnohierax Ridgway, Smiths. Misc. Coll., Ixxii, No. 4, 1920, 2. (Type, by 



original designation, Falco leucorrhous Quoy and Gaimard.) 

 Heteroaetus Kaup, Mus. Senckenb.^ iii. Heft 3, 1845, 261. (New name for 



Geranoaetus.) 



Small to large Buteones (wing 230-500 mm.) with longest primary 

 exceeding distal secondary by from less than one-third to more than 

 one-third the length of the wing; tarsus strong, short, scaled, less than 

 twice to more than twice the length of the middle toe without claw 

 and feathered for a varying distance in front; nostrils oval; obliquely 

 horizontal; and with from three to five outer primaries incised on their 

 inner webs. The genus Buteo is such a composite (that is, is so 

 variable within its included subgenera) that any description of the 

 genus as a wiiole would be largely a matter of exceptions in one or 

 another subgenus of all the generic characters. Therefore, beyond the 

 above generalities, it seems better to describe the subgenera independ- 

 ently rather than to attempt a composite description, which would be 

 rendered only confused by the number of contradictions and excep- 



