no. 3637 HERMIT THRUSH ALDRICH 25 



Zoology at the University of Michigan, are convinced that the type- 

 specimen of oromelus, which is in that museum, is in fact a represent- 

 ative of the Cascade race. Van Tyne (in litt., 1955) reported that he 

 had compared the type, an immature male, with two breeding male 

 specimens I had sent him, one typical of the Cascade race and the 

 other typical slevini, and found that it was closer in color to the 

 former. The measurements of the type of oromelus (wing 93 mm, tail 

 72, exposed clumen 13, tarsus 29.5, and midtoe 15) are typical of 

 the Cascade and southern British Columbia population and quite 

 unlike those of slevini. For indication of intergradation between 

 oromelus and slevini in western Oregon and Washington, see the 

 account under slevini (no. 4). 



8. Yukon hermit thrush: Catharus guttatus euborius (Ober- 

 holser). — Pale, Light Brownish Olive. Medium sized, small billed: 

 c? (21 specimens), wing 89-97.5 (93.4), tail 65-73.5 (69.2), culmen 

 12-14 (13.0), tarsus 26.5-30 (28.8), midtoe 16.5-18.5 (17.3); 9 (8 

 specimens), wing 87.5-97.5 (91.2), tail 65-75 (68.9), culmen 10.5-13 

 (12.2), tarsus 25.5-30 (27.8), midtoe 14.5-18.5 (16.2). 



Longer wing, paler and more rufescent than guttatus and vaccinius; 

 longer wing and tarsus, paler and more rufescent than oromelus; 

 shorter tarsus and more grayish than faxoni and crymophilus; shorter 

 wing and bill than sequoiensis and auduboni. 



Breeds from central Alaska southeastward through southern Yukon 

 to central British Columbia and southwestern and south-central 

 Alberta. 



Winters from Arizona (Santa Rita Mountains) and western Texas 

 (Brewster County and mouth of Pecos River) south to northeastern 

 Mexico (Rodriguez and Monterrey, Nuevo Leon). In migration east to 

 Illinois (Glen wood), Mississippi (Saucier), and Georgia (Jeff ersonville) . 



The original description of euborius (Oberholser, 1956) fits the 

 characteristics of this population very well. The original range given 

 also falls entirely within the more extensive area in which the charac- 

 ters were found to occur in the present study. 



This population has been included by earlier authors, such as 

 Ridgway (1907), Gabrielson and Jewett (1940), and Rand (1948), 

 within the range of sequoiensis. More recently, however, most authors 

 have considered the birds of this area referable to guttatus (Munro 

 and Cowan, 1947; Brooks and Swarth, 1925; the American Ornitholo- 

 gists' Union, 1957; and Ripley, 1964). 



Phillips (1962), after rejecting the name euborius because he con- 

 sidered the type-specimen too worn for certain identification but 

 probably referable to the eastern hermit thrush "nanus" (= faxoni), 

 proceeded to describe as a distinct subspecies the breeding birds of 

 the central and northern interior of British Columbia and named the 



