2. TtTEDXIS. 219 



of the feathers of the underjiarts have dark shaft-lines. In all 

 other respects this species agrees with T. liaiuvwelli. It probably 

 owes its claim to specific rank solelj- to the accident of its having 

 become isolated on an island and thus having no opportunity of 

 interbreeding with its near allies. Length of wing 4'6 to 4'35 inches, 

 tail 3'4 to 3-26, ciilmen 0-96 to 0'94, tarsus 1'32, bastard primary 

 1-05 to 0-95. 



The St. -Vincent Sabian Thrush appears to be confined to the 

 island of St. Vincent in the AVest Indies. 



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

 but I have examined a skin in the Cambridge Museum, and the 

 types in the Museum of the Smithsonian Institution in Washington. 



Tardus grayii and Turdus casius. 



This Thrush has two extreme forms, between which intermediate 

 forms occur. 



33. Turdus grayii, 



Turdus helvolus, Licht. Preis-Verz. Mex. Vog. no. 85 (1830, f/esw. 



nulla) ; Licht. Xom. Av. Mtis. Zool. Bero'l. p. 26 (1854) ; Cab. 



Journ. Orn. 1863, p. 57. 

 Turdus gravii, Bp. P. Z. S. 1837, p. 118; Grat/, Gen. B. i. p. 219 



(1847) ; Bj). Consp. i. p. 272 (1850) ; Cab. Mus. Hein. i. p. 4 



(1850) ; Sdater, P. Z. S. 1859, p. 330; Scl. ^- Sal v. Ibis, 1859, 



p. 5; Cab. Journ. Orn. 1860, p. 323; Owen, Ibis, 1861, p. 60; 



Baird, Bev. Am. B.\. p. 26 (1864, partivi) ; Lawr. Ann. L. N. H. 



New York, ix. pp. 91, 199 (1808) ; Sumichrast, Mem. Bost. Soc. 



N. H. i. p. 543 (1869) ; Gray, Iland-l. B. i. p. 257. no. 3741 



(1809) ; Frantsiiis, Journ. Orn. 1869, p. 290; Scl. ^- Salv. P. Z. S. 



1870, p. 830; Grayson, Pr. Bost. Soc. N. H. xiv. p. 276 (1871) ; 



Scl. Sc Salv. Komencl. Av. Neotr. p. 1 (1873). 

 Planestieus graj-ii {Bp.), Bp. Compt. Bend, xxxviii. p. 4 (1854). 

 Planesticus luridus, Bp. Compt. Bend, xxxviii. p. 4 (1854). 

 Turdus tristis. Swains., ajuid Sdatcr, P. Z. S. 1856, p. 294. 

 Turdus luiidus (Bp.), Scl. ^- Salv. Nomencl. Av. Xeotr. p. 2 (1873). 



In the adult male the general colour of the upper parts is uniform 

 olive-brown ; inside webs of quills and tail brown ; lores brown ; 

 no trace of eye-stripe. Underparts uniform pale huffish brown, 

 slightly paler on the centre of the belly, chin, and upper throat, the 

 latter with long fan-shaped terminal brown streaks ; axillaries and 

 under wing-coverts pale chestnut : inner margin of quills pale 

 chestnut. Bill dark brown above and below. "Wing with the third, 

 fourth, and fifth primaries nearly equal and longest, second primary 

 about equal to the seventh, bastard primary l-Qo to O'S inch. 

 Legs, feet, and claws dark brown. Length of wing 4-7 to 4-3 inches, 

 tail 3-9 to 3-55, culmen 0-93 to 0-84, tarsus 1-3 to 1-2. 



The female does not differ from the male hirds of the year ; and 

 young in Jirst plumage have all the characteristic markings of the 

 same plumage of allied species. 



Typical forms of Gray's Thrush are found in the Tres Marias 

 Islands and on the mainland of West Central Mexico, extending 



