2. XFEDUS. 203 



The synonj-my of the Western form is as follows : — 



14. Tardus ustulatus. 



Turdus ustulatus, KuttaU, Man. Orn. i. p. 400 (1840) ; Baird, Cass., 

 ^- Laivr. B. JV. Amer. p. 215, pi. Ixxxi. tig-. 1 (1858) ; Baird, 

 Bei-iew, p. 18 (1864); Ball 4'- Bann. Tr. Chic. Acad. i. p. 275 

 (18G9) ; Gra7j, Hand-l. B. i. p. 254. no. 3683 (1869); Salv. S^- Godm. 

 Biol. Centr.-Amer. Zoo!., Aves, i. p. 10 (1879). 



Turdus swainsoni, Cab.,var. ustulatus (Nutt.), Coues, Kei/ N. Amer. 

 B. p. 73 (1872); Baird, Brewer, Sf Ridyw. IlisL N. Amer. B. i. 

 p. 16 (1874). 



Turdus (Hyloeichla) swainsoni. Cab., c. ustulatus (Nutf.), Coues, 

 Birds Colorado Vail. p. 35 (1878). 



This form is scarcely distinguishable from T. swainsoni, from 

 which it is said only to differ in being slightly more rufescent on. 

 the upper parts. Length of wing 4*1 to 3-7 inches, tail 3-15 to 2-Q, 

 culraeu 0-66 to 0-5S, tarsus 1-22 to 1-05. 



The AVestcrn form of the Olive-backed Thrush breeds on the 

 Pacific slopes of the Rocky Mountains from Alaska to California, 

 and winters in the Tres-Marias Islands off the coast of Mexico and 

 in Guatemala. 



a. c? ad. sk. Fodalgo Bay. Dr. Lyall [P.]. 



b, c. Ad. st. North America. 



15. Turdus fuscescens. 



Turdus fuscescens, Stephens *. 



Le Mauvis de la Caroliue, Briss. Orn. ii. p. 212 (1760). 



La Grivette d'Amerique, Montb. Hist. Nat. Ois. iii. p. 289 (1775). 



Little Thrush, Lath. Gen. Si/n. ii. p. 20 (178.3). 



Tardus minor, Gmel. Si/.'<f. Xaf. i. p. 809 (1788) ; Zath. Ind. Orn. 

 i. p. 328 (1790) ; Vieill. N. Diet, d'llist. Nat. xx. p. 232 (1818) ; 

 Bp. Comp. List B. Eur. Sf X. Amer. p. 17 (1838) ; d'Orbiymj, La 

 Sagra's Cuba, Ois. p. 47, pi. v. (1840). 



Turdus mustelinus, Gmel., apud Wilson, Amer. Orn. v. p. 98, pi xliii 

 (1812). ^ ' 



Turdus fuscescens, Stephens, Share's Gen. Zool. x. p. 182 (1817) ; 

 Graij, Gen. B. i. p. 21 9 (1847) ; Baird, Cass., S,- Lam: B. X. Amer. 

 p. 214 (1858) ; Sclater, P. Z. S. 1859, p. 326 ; id. Cat. Ame): B. p. 2 

 (1862) ; Baird, Beview, p. 17 (1864) ; Pelzeln, Orn. Bras. ii. p 92 

 (1868) ; Gra;/, Hand-l. B. i. p. 254. no. .3681 (1809) ; Cones, Key 

 N. Amer. B. p. 73 (1872); Scl. S,- Sale. Xomenel. Av. Xeotr. p. I 

 (1873) ; Cones, B'. X. West, p. 5 ( 1874) ; Baird, Breicer, Si Bidt/w. 

 Hist. X. Amer. B. i. p. 9 (1874) ; Salv. 4- Godm. Biol. Centr.-Amer 

 Zool., Aves, i. p. 10 (1879). 



* There cau be no doubt tb.at the n.ame giren bv Stepbens to tliis species 

 has been used by the greatest number of ornitliologists, and I therefore adopt 

 it in preference to the older name given by Gmelin. Tbose writers who wish 

 to harmonize this decision with the rules of the British Association must 

 assume that Gmeliu's diagnosis does not "clearly define" the species and that 

 Stephens's does. 



