202 TURDIDiE. 



The female does not appear to differ from the male. Afto- the 

 autumn moult the olive-brown of the upper parts and the buff of 

 the cheeks, car-covcrts, and throat is slightlj' richer and darker in 

 colour. Birds of the year have traces of pale tips to the greater 

 wing-coverts. Younij in first pi timet ije are described as very similar 

 to those of the nearly allied species. 



Tlie Buff-breasted form of the Olive-backed Thrush breeds in the 

 whole of Canada as far north as the Arctic Circle, extends westwards 

 into Eastern Alaska and southwards down the Eocky-Mountain 

 chain as far as the Great Salt Lake. It winters in Cuba, Costa 

 Eica, Panama, Colombia, Ecuador, Peru, aud Bolivia. It is said 

 occasionally to pass west of the Pocky Mountains, through California 

 to Mexico and Guatemala. 



a. Ad. sk. Pennsylvania {J. Kuder'). H.Seebolira,Esq.[P.]. 



h, c, d. 5 ad. sk. Fort Simpson. B. R. Ross, Esq. [C.]. 



e. 2 ad. sk. West side of Rocky Mountains. J. K. Lord, Esq. [P.]. 



/. Ad.sk. Bogota, New Granada. H.Seebohm,Esq.LP.]. 



g. Ad. sk. Bolivia. Mr. Bridges [C.]. 



The synonymy of the Grey-cheeked form is as follows : — - 



13. Tardus alicise. 



Turdus alicise, Baird, Cass., 8f Laior. B. N. ^w<?r. p. 217, pi. 81. 



fig. 2 (18,58) ; Sdater, P. Z. S. 1859, p. 326 ; Baird, Review, i. 



p. 21 (1864) ; Dnll ^ Barm. Tr. Chic. Acad. i. p. 275 (1869j ; 



Grai/, Haml-l. B. i. p. 254. no. 3686 (1869) ; Frantzius, Journ. 



Orn. 1869, p. 289 ; Baird, Brewer, ^ Bidc/iv. Hist. N. Amer. B. 



i. p. 11 (1874); Tacz. Bull. Soc. Zool. France, 1876, p. 148; 



Sah. Sf Godm. Biol. Centr.-Amer. Zool, Aves, i. p. 12 (1879). 

 Turdus swaiusonii, Cab., var. alicia {Baird), Coues, Key N. Amer. B. 



p. 73 (1872). 

 Tm-dus swainsoni. Cab., apnd Cordeaux, IJns, 1875, p. 177, apud 



Seebohm, Ilns, 1877, p. 164, ajmd Dalyleish, Bull. Nutt. Orn, 



Club, lb80, p. 68. 

 Turdus (Tlylocichla) swainsoni, Cab., b. alicire {Baird), Coues, 



Birds Colorado Vail. p. 35 (1878). 



This form differs from the preceding only in having no buff on 

 the eye-stripe, round the eye, chin, cheeks, or ear-coverts, and very 

 little on the throat and upper breast. It is on an average a some- 

 what larger bird. Length of wing 4-25 to 3-9 inches, tail 3-0 to 

 2*75, culmen 0-7 to 0-6, tarsus 1*3 to I'l. 



The grey-cheeked form of the Olive-backed Thrush breeds in 

 Arctic America from the Atlantic to the Pacific, crossing over 

 Bchring's Straits into Siberia north of Kamtschatka. It has been 

 obtained in winter in Cuba, Costa Pica, aud Panama, and as far 

 south as Amazonia. 



a. Ad. sk. Repulse Bay. Dr. Rae [P.]. 



h. 2 ad. sk Wiscousin, Sept. 28, 1875. Dr. Brewer [P.]. 



c. S ad. sk. Chamicuros (E. Peru), E. Bartlett, Esq. [C.]. 



March 20, 1868. 



