212 TURDID^. 



broAvu. Bill yellowish brown above and below, "^"ing with the 

 fourth and fifth primaries nearly equal and longest ; second primary 

 between the sixth and seventh, occasionally between the seventh 

 and eighth ; bastard primary 1-0 to 0-6 inch. Legs, feet, and claws 

 brown. Length of wiug 4-1) to 4-57 inches, tail 4-0 to 3-5, culmen 

 0-'J2 to 0-81, tarsus 1-25 to M. 



There appears to be no difference between tlie sexes. Before 

 sprhig the yellower tint of the back has faded away, and the general 

 colour of the upper parts has become a uniform olive-brown; the 

 olive tint has also nearly gone from the breast and flanks, which 

 become an almost neutral pale brown. Birds of the year generally 

 have ochraceous tips to some of the greater wing-coverts, and occa- 

 sionally dark tips to some of the feathers of the breast. Young in 

 Jirst plumage have the usual markings of nestHng Thrushes. 



Swainson's Thrush is found in South Mexico and the greater part 

 of Central America. In Honduras, Nicaragua, and Costa Itica inter- 

 mediate forms occur. 

 a. Ad. sk. Costa Eica. H. Seebohm, Esq. [P.] 



The synonymy of the extreme form is as follows : — - 

 23. Turdus leucauchen. 



Tm-dus leucauchen, Sclater, P. Z. S. 18-38, p. 447 ; Scl. 8,- Salv. Ibis, 

 1859; p. ; Sclater, P. Z. S. 1859, p. 328 ; id. Cat. Amer. S. p. 3 

 (1862); Saird, Ecv. Am. B. i. p. 24 (1864); 8ahin, P. Z. S. 

 1867, p. 132 ; Laivr.* Ann. L. New York, ix. p. 91 (1868); Gray, 

 Hand-l. B. i. p. 257. no. 3749 (1869) ; Scl. cV Salv. P. Z. S. 1870, 

 p. 838. 



This form differs from the preceding in having the upper parts an 

 almost uniform dark slate-grey, with a slight trace of olive ; the 

 olive-brown of the undcrparts has become grey ; the axillarics and 

 under wing-coverts are pale brown, dashed here and there with buff', 

 and the inner margin of the quills is only slightly paler than the 

 rest of the under surface. The dimensions and the wing-formula 

 are the same. 



This is apparently a local race ; and can only claim subspecific 

 rank, inasmuch as everj' possible intennediate form occurs between 

 them, the two extreme forms being comparatively rare. It is found 

 in Honduras, Nicaragua, Costa Kica, and North-eastern Guatemala. 



a. J ad. sk. Guatemala, Nov. 1873 (Salvin). H. Seebohm, Esq. [P.]. 



b, c. Ad. sk. Guattimala. Purchased. 



d. Ad. sk. Choclum, Vera Paz. O. Salvin, Esq. [P 1. 



e. Ad. sk. Vera Paz. O. Salvin, Esq. [C.]. 



24. Turdus gjrmnophthalinus. 



Tm-dus g^'mnophthalmus, Cab. Sclio7hb. Beis. Guian. iii. p. 665 

 (1848)V Licht. Kom. Av. Mas. Zool. Berol. p. 25 (1854) ; Sclater, 

 P. Z. S. 1859, p. 329; id. Cat. Amer. B. p. 4 (1862) ; Taylor, Ibis, 



* Spelt Iciicauchan. 



