PASSEEES TUEDIDAE TUEDUS SWAINSONI. 



147 



found it as late as November 8. It would seem to be far from common so 

 far east ; California and the Sierra Nevadas appearing to include its general 

 range. None were found in 1874 in Arizona, though, looked for in much 

 the same localities as the previous year.. Its habits seem to differ in no 

 noteworthy respect from the allied forms. It appears fond of solitude, and 

 prefers the thickest and shadiest thickets, where it is constantly busied in 

 searching among the leaves for seeds and insects. Its small size is apparent 

 at first sight, and serves, even when alive, to distinguish it from either var. 

 auduboni or pallasi. 



T (JED US SWAINSONI, Cab. 



Olive-Backed Thrush. 



Turdiis swainsoni, CAB., Tschudi's Fauna Peruana, 1844-46, 188. BD., B. N. A.. 1858, 

 210. Id., Rev. A. B., i, 1SC4, 19. EIDGW., Proc. Acacl. Nat. Sci. Plrihi., 1809, 

 128. COOP., B. Cal., i, 1871, G. ALLEN, Bui. Mus. Coiup. Zool., iii, 1872, 173 

 (Eastern Kausas). SNOW, Birds Kansas, 1872, G. Cs., Key N. A. B., 1872, 

 72. HENSHAW, Ann. Lye. N. H. N. Y., xi, 1874. Id,, Eep. Orn. Sp., 1873, 

 Wheeler's Exp., 1874, 56. Cs., U. S. Geog. Surv. Terr., B. N. W., 1874, 4. 



Observed by Mr. Ridgway in the Wahsatch Mountains, where it was 

 common, being one of the most characteristic summer birds of that region, 

 and inhabiting the shrubbery along the streams of the canons, but not 

 extending upward to the pine region. In the vicinity of Denver, the species 

 makes its appearance about the 10th of May, and by the 17th the thickets 

 and partially open ground in swampy localities were fairly swarming with 

 these birds. They were perfectly silent, and busied themselves after the 

 usual manner of the family in scratching and seeking among the leaves for 

 food. The males preceded the arrival of the females by at least a full week. 



