16 



REVIEW OF AMERICAN BIRDS. 



[part I. 



I liave little to add to the remarks on this species in the Birds of 

 North America, except that the predominant shade in the back is 

 the olive of swainsonii rather than the reddish of fuscescens, as in 

 T. pallasii. I have, however, not mentioned the difference in the 

 bill, which, besides being smaller, is much more depressed, as in 

 Anthus. The height of the bill at the base just back of the nostrils 

 in paUasii is from .17 to .19 of an inch, while in nanus it is only .15. 

 The distance from tip of bill to nostril is .35 or .36 ; the length of 

 tarsus, 1.07 to 1.10; the wing, 3.30 to 3.48. The clear plumbeous 

 cast of the flanks and thighs, and the white crissum of nanus, con- 

 trast characteristically with the rufous tinge of the same parts in 

 jiallasii. The legs are rather darker and considerably more slender. 



Pallas, in his Zoographia Rosso-Asiatica, I, 1831 (?), 465, de- 

 scribes a Mascicapa guttata from Kodiak, an island of the Russian 

 American Archipelago, collected by Billings. This was, in all pro- 

 bability, a young Thrush in the immature spotted plumage, and if 

 any described Xorth American species, may, from its size and colora- 

 tion, be referred to Tm-clus nanus, rather than to any other Thrush. 

 Should this be substantiated, the name guttatus must take prece- 

 dence ; but as there is still some uncertainty on the subject, I prefer 

 to make no change at present until young birds of the species can 

 be procured. A young T. paJlasii shows some rather marked differ- 

 ences from Pallas' description. 



List of Specimens. 



Locality. 



Sacramento Valley. 

 Foi-t Crook, Cal. 

 Fori Bridger. 

 Frontera, Tex. 

 San Gertrude Mt., 

 Cape St. Lucas. 



When 

 Collected. 



May 20, '59. 

 April 29 

 May S. 



Jan. 1861. 



Received from 



Lt. Williamson. 

 J. Feilner. 

 C. Drexler. 

 Major Emory. 



J. Xantus. 



Collected by 



Dr. Js'ewberry. 

 Chas. Wright. 



Turdiis aiiduljoui. 



Turdus auduboni, Baied. 



Merula silens, Swainson, Philos. Mag. I, 1827, 369 (not Turdus silens of 

 ViEiLLOT, Encycl. Mutli. II, 1823, 647, based on T. musteJinus, Wils. 

 = T. fuscescens). — Ib. Fauna Bor.-Amer. II, 1831, 186. — Baikd, 

 Birds N. Amer. 1858, 213, and 922.— Sclater, P, Z. S. 1858, 325 

 (La Parada), and 1859, 325 (Oaxaca).— Ib. Catal. Am. Birds, 1861, 

 2, no. 9. 

 Hah. Rooky Mountains, from Fort Bridger south into Mexico. 



Since ray article on the genus Tardus was published in the Birds 



