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. Drexl,er, 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 

 pallasii. It is probably the same variety that Dr. Sclater refers to 

 as T. pallasii from Orizaba. 



Whether the present bird be specifically distinct from T. pallasii 

 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 T. auduboni belongs to the central 

 North American plateau, ranging from Fort Bridger to Orizaba. 



As the name of T. silens is pre-occupied in the genus by Vieillot, 



I have ventured to affix the name of T. auduboni to the present bird, 



basing the name upon the largest specimen from Fort Bridger 



(10,886). 



List of Specimens. 



Locality. 



Fort Bridger? 

 Cantonment Bur- 

 Mexico. [gwyn,N.M. 



When 

 CoUected. 



May 28, '58. 



Received from 



C. Drexler. 



Dr. W. W. Ander- 



J. Gould. [son. 



Prof. Sumichrast. 



Collected by 



10,886. Type. No. 11,734. 8; 11.25; 3.75. 



Turdus fuscescens. 



Turdus mustelinus, Wilson, Am. Orn. V, 1812, 98, pi. 43 (not of Gmelin). 



Turdus fuscescens, Stephens, Shaw's Gen. Zool. Birds, X, i, 1817, 182. 

 Cab. Jour. 1855, 470 (Cuba).— Baird, Birds N. Am. 1858, 214.— 

 Sclater, P. Z. S. 1859, 326.— Ib. Catal. Am. Birds, 1861, 2, no. 10, 



Turdus silens, Vieill. Enoyclop. Metli. II, 1823, 647 (based on T. muste- 



I{71US, WiLS.). 



2 June, 1864. 



