TURDUS SWAINSONI. 397 



afterward determined to be this species, shyly flitting into the gloomy 

 maze of foliage at our approach. 



List of .specimens. 



779, 9 ad.; Truckee Reservation, Nevada, June 2, 1868. 7f— 12— 3^. Bill, black, 

 basal balf of lower mandible, pale browuish-lilac; iris, sepia; tarsi, dilute lilaceous- 

 brown ; toes, darker. 



/?. sivainsoni — Sivainsoti's Thrush; Olive-hadccd Thrush. 



Titrdus swainsoni, Cabanis, Tscbudi's Fauna Peruana, 1844-'4G, 188. — Baird, B. 

 N. Am., 1858, 21G; Cat. N. Am. B., No. 153 ; Rev. Am. B., 186-1, 19.— Cooper, 

 Oru. Cal., 6.— CouES, Key, 1872, 72 ; Check List, 1873, No. 5.— B. B. & R., 

 Hist. N. Am. B., I, 1874, 14, pi. i, fig. 4.— Henshaw, 1875, 147. 



Turdus stcainsoni. a. swainsoni, CouES, B.N.W., 1874, 4. 



After leaving the Sierra Nevada, not a single individual of any species 

 of the smaller Thrushes was met with until we arrived at the East Hum- 

 boldt Mountains, in eastern Nevada, where the Olive-backed Thrush was 

 encountered, in considerable numbers, in the eastern canons of tliat range. 

 It was during the season of their southward migration, and it is uncertain 

 whether they came from the northward, or whether they had bred in the 

 canons where they were observed. During the ensuing spring and summer 

 they were found in still greater abundance among the Wahsatch Mount- 

 ains, on the opposite side of the Salt Lake Basin, in the thickets bordering 

 the canon streams, particularly in the elevated "parks," thus occupying a 

 region intermediate between that of the Rocky Mountain Hermit Thrush 

 (T. auduhoni) of the pine-region, and that of the Tawny Thrush {T. fusces- 

 cens) of the lower valleys. 



The song of this species is simple and brief, but very sweet, though 

 less so than that of either T. fuscescens or T. ustulatus. 



List of specimens. 



886, 3 ad.; East Humboldt Mountains, Nevada, September 1, 1868. 7^-12^ 

 — 3f . Bill, black, the basal half of lower mandible, pale lilaceous-brown ; interior of 

 mouth, rich yellow; iris, dark brown; tarsi and toes, dilute lilaceous-brown, with a 

 slight i)lunibeous cast — the tarsi whitish on the posterior edge. 



918, i ad.; East Humboldt Mountains, September 11. 74—114-3/^. Same re- 

 marks as to preceding. 



1262, nest and eggs (4); Parley's Park (Wahsatch Mountains), Utah Territory, 

 June 23, 1869. Nest on bush near stream ; female shot on nest. 



