1920 J Supplement to the A. 0. U. Check-List. 445 



mond, Proc. U. S. Nat. Mus., LIII, Aug. 16, 1917, p. 598.) The 

 only species is 



638. Limnothlypis swainsonii (Audubon). 



Vermivora rubricapilla (Wilson) becomes Vermivora ruficapilla 

 (Wilson) (Sylvia ruficapilla Wilson, Amer. Ornith., Ill, 1811, p. 120, 

 pi. XXVII, fig. 3; near Nashville, Tenn.), because the latter is not 

 preoccupied by Sylvia ruficapilla Latham 1790, since this is merely 

 a nomenclatural combination — i. e., not an original description. (Cf. 

 Cooke, 'The Auk,' XXIX, No. 4, Oct., 1912, p. 545.) The races of 

 this species therefore become 



645. Vermivora ruficapilla ruficapilla (Wilson). 

 645a. Vermivora ruficapilla gutturalis (Ridgway). 



Compsothlypis americana usneae Brewster becomes Compsothlypis 

 americana pusilla (Wilson), because Sylvia pusilla Latham (Suppl. 

 Ind. Orn., 1801, p. 56), which supposedly preoccupied Sylvia pusilla 

 Wilson (Amer. Ornith., IV, 1811, p. 71, pi. 28, fig. 3; eastern Penn- 

 sylvania), is only a nomenclatural combination, not an original de- 

 scription, and thus does not invalidate Wilson's name; and the latter, 

 therefore, becomes available for the bird later described as Comp- 

 sothlypis americana usneae Brewster. (Cf. Brewster, 'The Auk,' 

 XXXV, No. 2, April, 1918, p. 228.) 



Saxicola Bechstein becomes Oenanthe Vieillot (Analyse Nouv. Syst. 

 Orn. Element., 1816, p. 43; type by tautonymy, Motacilla oenanthe 

 Linnaeus), because the type of Saxicola is, by subsequent desig- 

 nation, Motacilla rubicola Linnaeus, a number of the genus Pratincola 

 Koch. (Cf. Mathews, Novit. Zool., XVIII, No. 1, June 17, 1911, p. 20). 

 The North American forms are: 



765. Oenanthe oenanthe oenanthe (Linnaeus). 

 765a, Oenanthe oenanthe leucorhoa (Gmelin). 



CHANGES OF NOMENCLATURE REJECTED. 



Colymbus Linnaeus versus Podiceps Latham. (Cf. Mathews, Novit, 

 Zool., XVII, No. 3, Dec. 15, 1910, pp. 494-495; Mathews and Iredale. 

 Ibis, 1913, pp. 217-218.) Change rejected, because the earliest valid 

 type designation of Colymbus Linnaeus is Colymbus cristatus Linnaeus, 

 by the Committee of the American Ornithologists' Union (Check-List 

 North Amer. Birds, 1886, p. 73). The designation of Colymbus 

 arcticus Linnaeus by Gray (Cat. Gen. and Subgen. Birds, 1855, p. 

 125) must be regarded as ineffective, since it is specifically stated to 

 refer to Linnaeus at 1735 ("1735 nee 1766"), and therefore cannot 

 be used for the 1758 edition of the 'Systema Naturae.' (Cf. Hartert, 

 Brit. Birds, IX, 1915, p. 55.) 



Gavia Forster versus Colymbus Linnaeus. (Cf. Sclater, List Brit. 

 Birds, ed. 2, 1915, pp. 39S-399.) Change rejected, because by the 



