wel Fah Supplement to the A. O. U. Check-List. 445 
mond, Proc. U. 8S. Nat. Mus., LIII, Aug. 16, 1917, p. 598.) The 
only species is 
638. Limnothlypis swainsonii (Audubon). 
Vermivora rubricapilla (Wilson) becomes VWermivora ruficapilla 
(Wilson) (Sylvia ruficapilla Wilson, Amer. Ornith., III, 1811, p. 120, 
pl. XXVII, fig. 8; near Nashville, Tenn.) because the latter is not 
preoccupied by Sylvia ruficapilla Latham 1790, since this is merely 
a nomenclatural combination—~. e., not an original description. (Cf. 
Cooke, ‘The Auk,’ X XIX, 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, pl. 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. Elément., 1816, p. 43; type by tautonymy, Motacilla oenanthe 
Linnaeus), because the type of Sazicola 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, Dee. 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 nec 1766’), and therefore cannot 
be used for the 1758 edition of the ‘Systema Naturae.’ (Cf. Hartert, 
Brit. Birds, [X, 1915, p. 55.) 
Gavia Forster versus Colymbus Linnaeus. (Cf. Sclater, List Brit. 
Birds, ed. 2, 1915, pp. 898-399.) Change rejected, because by the 
