180 TUEDrD^. 



centre of belly buffish white, shading into brown on the flanks ; 

 under tail-coverts pale bufF, the longer feathers paler and margined 

 with brown ; axillaries pure white, lower under wing-covcrts white 

 witli brown bases ; basal half of inner web of the secondaries and 

 many of the primaries white ; inner margin of qiiills scarcely paler 

 than the rest of the under surface. Bill dark brown above and 

 below. Wing with the third and fourth primaries nearly equal and 

 longest, second primary between the fifth and sixth, bastard pri- 

 mary U"6 inch. Tail with the outside feathers 0'2 to 0-3 inch 

 shorter than the longest. Length of wing 5-2 to 4'8 inches, tail 

 3-45 to 3-2, culmen 0-91 to 0-81, tarsus 1-13 to 1-04. 



The female differs from the male in having the pale markings on 

 the head, nape, upper back, chin, throat, and breast more pro- 

 nounced. The general colour of both the upper and under parts is 

 also paler. In the young in first phmicige the pale markings are 

 still more pronounced, and the feathers of the rest of the upper 

 parts have pale chestnut centres and tips, whilst nearly every feather 

 of the underparts is pale ochraceous with a nearly black narrow 

 margin. It is not known that the autumn jjJumage varies much 

 from that of spring. 



The Mexican Ground-Thrush appears to be confined to the pine 

 region of South Mexico, where it is supposed to be a resident. 



The British Museum does not possess an example of this species ; 

 but the descriptions have been taken from skins in the collections 

 of Dr. Sclater and Messrs. Salvin and Godman. 



37. Geocichla sibirica. 



Turdus sibiricus, PaJl. Reis. Jtuss. Reich, iii. p. 694 (177fi) ; Omel. 



S,/st. Nat. i. p. 815 (1788) ; Lath. Ind. Orn. i. p. 333 (1790) ; 



Vieill. N. Diet. d'Hist. Nat. xx. p. 273 (1818); Tetmn. Man. 



d'Orn. iii. p. 98 (1835) ; Gould, B. Eur. ii. pi. 82 (1837) ; Gray, 



Gen. B. i. p. 219 (1847) ; Teymn. et Schl. Faun. Jap. Aves, p. (3(3, 



pi. xxxi. (1847); Bj). Consp. i. p. 274(1850); Licht. Nvmencl. Av. 



p. 20 (1854); Bp. Compt. Rend, xxxviii. p. 5 (1854); ,Schl. Vog. 



Nederl.^. 214 (1854) ; Sivinh. Ibis, 1861. p. 410 ; Duhoii<, Ois. Eur. 



pi. xlvi. (1862); Neiot. List B. Eur. B/asius, p. 9 (18(;2); Radde, 



Reis. Sibir. Vog. p. 233 (1863) ; Deyl. et Gerbe, Orn. Eur. i. p. 416 



(1867); Graiillland4. B. i. p. 256. no. 3718 (1869) ; Fritsch, Vog. 



Eur. p. 145 (1870) ; Sioinh. P. Z. S. 1871, p. 367 ; Ilarting, Handb. 



Br. B. p. 101 (1872) ; Stvinh. Ibis, 1874, p. 443; Blyth Sf Wald. 



B. Burm. p. 100 (1875) ; Dresser, B. Eur. pt. 1. (1876); Tacz. Bull. 



Soc. Zool. France, i. p. 149 (1876) ; David et Oust. Ois. Chine, p. 149 



(1877) ; Seehohm, Ibis, 1879, p. 5 ; id. Ibis, 1880, p. 191. 

 White-browed Thrush, Lath. Gen. Syn. ii. pt. 1, p. 31 (1783). 

 Turdus auroreus, Pallas, Zooyr. Rvsso-Asiat. i. p. 448 (1811,2); 



Gloqer, Isis, 1828, p. 1041 ; Kei/s. u. Bias. Wirb. Eur. pp. Ii, 178 



(1840); Gray, Gen. B. i. p. 218 (1847). 

 Turdus leucocillus, Pallas, Zooyr. Rosso-Asiat. i. p. 450 (1811, J); 



Newt. List B. Eur. Blasius, p. 9 (1862). 

 Turdus bechateinii, Naum. Vog. Deutschl. ii. p. 310, pi. Ixix. fig. 2 



(1822, 2). 

 Turdus atrocyanpus, Homeyer, Isis, 1843, p. 604. 

 Turdus nnitabilis, Temm., fide Bp. Compt. Rend, xxxviii. p. 5 (1854) ; 

 Gray, Iland-l. B. i. p. 256. no. 3719 (1869). 



