394 ORNITHOLOGY. 



tions, particularly in the fall, in all suitable localities embraced within the 

 country traversed by the expedition. The specimen in question was obtained 

 on Trout Creek, a tributary of the Humboldt River, and when observed 

 was perched on a low twig in a willow copse, silently watching us as we 

 reclined on the grassy bank of the brook. It uttered no note whatever, 

 and exhibited no fear at our presence. 



List of .specimens. 



5)28, 9 ad; Trout Creek, Upper Humboldt Valley, Nevada, September 16, 1868. 

 6|i — lOif — 2i|. Bill, black; basal half of the lower mandible, lilaceous-white; inte- 

 rior of the mouth, rich yellow; iris, dark bister; tarsi and toes, pale purplish-brown — 

 the toes darkest, the tarsi paler along their posterior edge. 



/?. auduboni — Rocky Mountain Hermit Thrash; Auduhon\s Hermit Thrush. 



Merula silens, Swains., Phil. Mag., 1, 1827, 309 (not Turdxis silens, Vieill. 1823 = 

 T. fnscescens). Turdus silens, Baird, B. N. Am., 1858, 213, 922; Cat. N. 

 Am. Birds, 1859, No. 149a. 



Turdus auduboni, Baird, Ifev. Am. Birds, ISGi, 16. 



Turdus pallasi var. auduboni, Coues, Key, 1872, 72; Check List, 1873, No. 4a. 

 — B. B. & R., Hist. N. Am. B., I., 1874, 21, pi. i, fig. 8.— Henshaw, 1875, 144. 



Turdus pallasi. b. auduboni, CouES, Birds N.W., 1874, 3. 



The large Mountain Thrush was first met with in the Wahsatch range, 

 where it inhabited chiefly the deep ravines of the pine region. The first 

 specimen seen was shot May 26, in City Creek Canon, near Salt Lake 

 City; but this was probably a mere straggler from the higher portions of 

 the mountains. In its manner of flight, which is gliding and noiseless, this 

 Thrush greatly resembles Townsend's Solitaire {Myiadestes townsendi), the 

 resemblance being increased by the pale ochraceous band across the base 

 of the I'emiges, which shows as a very conspicuous feature on both birds 

 when flying. The haunts of this bird were so diflficult of access from our 



pause of wings when fully stretched ; (3), length of wing from tip of the longest primary 

 to tlie carpal joint; (4), the same measurement to the metacarpophalangeal articula- 

 tion; (5), length of the culmeu (not including the cere, and if the bill is curved, the 

 chord, and not the arc, of the curve); (6), length of the tarsus in front; (7), length 

 of the tail to the ba.se of the coccyx; (8), length of the tail to the tip of the longest 

 npi)er coverts. If a measurement is wanting, its place is supplied by an interrogation 

 point, the order being invariably the same. All measurements, and notes on color of 

 eyes, etc., are from fresh specimens, before skinning. 



