22 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 124 



from the Olympic Peninsula noted by Phillips, as well as of similarly 

 colored specimens from the west slopes of the Cascades. These differ- 

 ences, however, seem to be better treated as indicating populations 

 intermediate in both size and color between the races slevini and 

 oromelus, with those closer to the coast being nearer slevini and those 

 closer to the Cascade divide nearer to oromelus. 



5. Sierra hermit thrush: Catharus guttatus seguoiensis (Belding) . — 

 Pale, Light Brownish Olive. Medium sized: cf (15 specimens), wing 

 93-100 (96.4), tail 67-75 (70.8), culmen 13-15 (14.1), tarsus 27-30 

 (28.6), midtoe 15-18.5 (16.8); 9 (6 specimens), wing 90-95 (92.5), 

 tail 64-73 (68.8), culmen 13-14.5 (13.8), tarsus 28-30 (28.7), midtoe 

 15-17.5 (16.4). 



Shorter wing and tarsus than auduboni; longer wing than slevini, 

 nanus, and guttatus; larger, paler, and more rufescent than oromelus 

 and vaccinius; longer bill than euborius; more grayish and shorter 

 tarsus than faxoni and crymophilus. 



Breeds in the Sierra Nevada, Mount Pinos, and San Bernardino 

 Mountains of California. 



Winters in Mexico (Baja California and Monterrey, Nuevo Leon) 

 south to Guatemala (Hacienda Chancol, also May 1 at Chemal). 



McCabe and McCabe (1933) and the American Ornithologists' 

 Union (1957) have correctly limited the northward extension of the 

 population to which the name seguoiensis applies to the Sierra Nevada 

 of California. Other populations to the north of California, even as 

 far as the Yukon River in Northwest Territory, have been referred 

 to seguoiensis by Ridgway (1907), Brooks and Swarth (1925), Gabriel- 

 son and Jewett (1940), Rand (1948), and Phillips (1962). These 

 populations, however, appear to be referable to other races or are 

 intermediate between these (see accounts under auduboni and euborius). 



6. Audubon's hermit thrush: Catharus guttatus auduboni (Baird). — 

 Pale, Light Brownish Olive. Largest: cf (45 specimens), wing 94-111 

 (101.6), tail 66.5-79 (73.5), culmen 13-15.5 (14.0), tarsus 27-31.5 

 (29.4), midtoe 15.5-19.5 (17.3); 9 (24 specimens), wing 92.5-101 

 (97.2), tail 66-74 (70.0), culmen 13-15.5 (14.4), tarsus 26.5-30.5 

 (28.7), midtoe 15.5-19 (17.0). 



Longer wing and tarsus but similar in color to seguoiensis and 

 euborius; larger and more grayish than crymophilus and faxoni; much 

 larger and more rufescent than oromelus and vaccinius; much larger 

 than guttatus and nanus. 



Breeds in the mountains of the Great Basin and Rocky Mountains 

 from southeastern Washington, middle Idaho, southeastern British 

 Columbia, and southwestern Alberta south almost to the Mexican 

 border. 



