TURDUS. 17 
of North America, I have seen several other specimens of the large 
race of Turdus pallasii. The back is rather more olivaceous than 
in pallasii, the rump paler and less rufous, and the colors generally 
much as in nanus. In the largest specimen (10,886, from Fort 
Bridger) the wing is 4.18 inches; tail, 3.60; bill, from tip to nostril, 
.45; tarsus, 1.26. Other specimens from Mexico and Guatemala 
are a little smaller, but all exceed pallasii in size. 
This species or race appears to belong to the high table lands of 
North America; the skin collected by Mr. Drexler, at Fort Bridger, 
and that from Cantonment Burgwyn (both localities in the Rocky 
Mountains), being however the only specimens recorded from the 
United States. On the other hand, it seems to be rather common 
in Mexico and Guatemala. 
A specimen from Orizaba agrees with the others referred to in the 
grayer plumage above, although not larger than many of the true 
pallasit. It is probably the same variety that Dr. Sclater refers to 
as 7. pallasit from Orizaba. 
Whether the present bird be specifically distinct from 7’ pallasie 
or not, there is no doubt of its being a decidedly marked race, of 
larger size and grayer plumage above. While, as defined, the true 
T. pallasii is confined to eastern North America, possibly not mi- 
grating south of its limits, the 7. auduboni belongs to the central 
North American plateau, ranging from Fort Bridger to Orizaba. 
As the name of 7’. szlens is pre-occupied in the genus by Vieillot, 
J have ventured to affix the name of 7. auduboni to the present bird, 
basing the name upon the largest specimen from Fort Bridger 
(10,886). 
List oF SPECIMENS. 
Smith-|Collec-) Sex When 
sonian| tor’s | and Locality. Collected Received from Collected. by 
No. No. | Age. ‘ 
10,886} 483 | ¢ | Fort Bridger? May 28,°58.| C. Drexler. |  ...... 
11,734 Bc .. | Cantonment Bur- 406 Dr Wi Wee Anders|| menses oe 
7,950 oc, .. |Mexico. [gwyn,N.M. atehe J. Gould, [SOWA en rare 
Taos tees ba se ove WL) eee eect 
13,580) .. ae ce eee | CT ee TN teal: Means ame we 
32,4502 355 -» |Orizaba. were Prof. Sumichtasty|| 4 9)... 
10,886. Type. No. 11,734. 8; 11.25; 3.75. 
— Turdus fuscescens. 
Turdus mustelinus, Witson, Am. Orn. V, 1812, 98, pl. 43 (not of Gezr). 
Turdus fuscescens, StEpHENS, Shaw’s Gen. Zool. Birds, X, 1, 1817, 182. 
Cas. Jour. 1855, 470 (Cuba).—Barirp, Birds N. Am. 1858, 214.— 
_ Scrater, P. Z. S. 1859, 326.—Is. Catal. Am. Birds, 1861, 2, no. 10. 
Turdus silens, Viet. Encyclop. Méth. II, 1823, 647 (based on 7. muste- 
linus, Wits.). 
2 June, 1864. 
