16 REVIEW OF AMERICAN BIRDS. [PART I. 
I have 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 swainsonit 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 pallasii 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 
pallasii. The legs are rather darker and considerably more slender. 
Pallas, in his Zoographia Rosso-Asiatica, I, 1831 (?), 465, de- 
scribes a Muscicapa 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 North American species, may, from its size and colora- 
tion, be referred to Turdus 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 7. pallasii shows some rather marked differ- 
ences from Pallas’ description. 
List or SPECIMENS. 
Smith-|Collec-| Sex 
sonian| tor’s | and Locality. When Received from Collected b 
Collected y 
No. No. | Age. a 
8,168 Fe .. | Sacramento Valley. sor Lt. Williamson. Dr. Newberry. 
16,143 | 353 2 | Fort Crook, Cal. May 20,759.) die kelner, © | ‘lt Vee eres 
10,885 an & | Fort Bridger. April 29 ChDrexler: || Sees eee . 
8.170 Frontera, Tex. May 8. Major Emory. Chas. Wright. 
32,165 |10,781| ¢ | San Gertrude Mt., 
Cape St. Lucas. | Jan. 1861. SRORAMETA S.C uge ) /eeeemer 
Turdus auduboni. 
Turdus auduboni, BAtrp. 
Merula silens, Swainson, Philos. Mag. I, 1827, 369 (not Turdus silens of 
Vieittot, Encycl. Meth. II, 1823, 647, based on 7. mustelinus, WLS. 
= T. fuscescens).—Is. Fauna Bor.-Amer. IJ, 1831, 186.—Bairp, 
Birds N. Amer. 1858, 213, and 922.—Sctarer, P. Z. 8. 1858, 325 
(La Parada), and 1859, 325 (Oaxaca).—Is. Catal. Am. Birds, 1861, 
2, no. 9. 
Hab. Rocky Mountains, from Fort Bridger south into Mexico. 
Since my article on the genus Zurdus was published in the Birds 
