292 TURDID^. 



paler at the base of the under mandible. Length of wing 3-5 to 

 3-3 inches, tail 3-1 to 3-0, culmen 0-G4, tarsus 1-3 to 1-25, bastard 

 primary 0-9 to 0-8. 



Nothing is known of any difference which may be attributable to 

 age, sex, or season. 

 ' The Mexican Thrush-Robin has only been obtained from the high- 

 lands of Southern Mexico, where it appears to be a resident. 



a. S ad. sk. Mexico. M. Verreaux. 



12, Catharus gracilirostris. 



Catharus gracilirostris, Salvin, P. Z. S. 1864, p. -580 ; Laivr. Ann. 



Lye. N. Y. ix. p. 90 (1868) ; Sclat. 8f Salv. Notnencl. Av. Neotr. 



p. 1 (1873) ; Salv. ^ Godm. Biol. Centr.-Amer. Zool., Aves, i. p. 6 



(1879). 

 Tardus gracilirostris (Salv.), Gray, TLand-l. B. i. p. 259. no. 3780 



(1869). 



Head, nape, and ear-coverts slate-grey ; the rest of the upper pai-ts 

 russet-brown ; inner web of quills and tail-feathers brown ; the 

 underparts, including the axillaries and under wing-coverts, slate- 

 grey, suffused with russet-brown on the breast and under tail- 

 coverts ; inner margin of quills brown. Bill black, slender, re- 

 sembling that of the genus Erithaeus. Wing with the fourth, fifth, 

 and sixth primaries nearly equal and longest, second primary equal 

 to the tenth or eleventh, bastard primary 0-9 to 0-85 inch, about 

 half the length of the second. Legs, feet, and claws brown. Length 

 of wing 3-0 to 2-7 inches, tail 2-5 to 2-2, culmen 0-6 to 0-55, tarsus 

 1-3 to 1-22. 



The female is not known to differ from the male. Birds of the 

 year have the head and flanks suffused with brown, the centre of the 

 belly greyish white, and the chin, upper throat, axillaries, and under 

 wing-coverts alone slate-grey. This may possibly be also the jjlu- 

 m^age of the female. Young in first plumc(ge have pale centres to 

 most of the feathers of the underparts, and probably also to the 

 smaU feathers of the upper parts. 



The Lesser Costa-llican Thrush-Eobin breeds in the mountain- 

 forests of the province whose name it bears, and is not su^jposed to 

 be migratory. 



The British Museum does not possess an example of this aberrant 

 species ; but skins are in the collections of Dr. Sclater and Messrs. 

 Salvin and Godman. 



6. ERITHACUS. 



Type. 

 Erythacus, Cuv. Leg. An. Conip. tab. ii. (1801) .... E. rubeciila. 



Ae'don, Forst. Syn. Cat. Br. B. p. 53 (1814) E. luscinia. 



Dandalus, Boie, Isis, 1826, p. 972 E. rubecula. 



Cvanecula, C. L. Brelim, Isis, 1828, p. 1280 E. cfeiulecula. 



Luscinia, C. L. Brehm, Isis, 1828, p. 1280 E. philomela. 



Daulias, Boie, Isis, 1831, p. 542 E. luscinia. 



Eubecula, C. L. Brehm, Yog. Dentschl. p. 360 (1831) E. rubecula. 



