20 TURDIDA. 
imo et crisso albis, subalaribus lete cervinis; rostro fusco-nigro, pedibus fuscis. Long. tota 9-0, ale 4-9, 
caudee 3°7, rostri a rictu 1°1, tarsi 1:2. (Descr. fem. ex Santa Fé, Panama. Mus. nostr.) 
Jw. subtus paulo dilutior, pectoris plumis fusco maculatis, tectricibus alarum cervino terminatis. (Descr. av. 
juv. ex Costa Rica. Mus. nostr.) 
Hab. Costa Rica®, Cervantes (Carmiol?, M. L. Calleja*), Orosi, Volcan de Poas 
(v. Frantzius®); Panama*, Santa Fé (Arcé*), Lion Hill (I/‘Leannan '). 
This Thrush, which seems to be the northern form of the South-American Turdus 
fumigatus, and still more nearly allied to the Amazonian 7. hauawelli, is distinguishable 
from both by the whiteness of the feathers of the middle of the abdomen and under 
tail-coverts, and from the former by its darker upper plumage. It was first described 
by Mr. Lawrence from a Panama specimen 4, whence we have also received examples >, 
as well as from the neighbouring State of Costa, Rica’, where Dr. v. Frantzius also found 
it, at Orosi, in February and on the Volcan de Poas in March®. At one time we sup- 
posed that, as the first specimens received were females, the males would prove to be 
dark-coloured ®, as the bird is not unlike the female of the South-American T urdus ser- 
ranus, the male of which is black’. Mr. Lawrence, however 2, has always held to the 
belief that the sexes do not differ in 7. odsoletus ; and all subsequent specimens received 
tend to show that he is right in his opinion’. The name odsoletus, chosen for this 
Thrush, seems to have been suggested by the presence in the type specimen of spots on 
the greater wing-coverts, the remains of the immature plumage. 
Turdus obsoletus appears to be nowhere common, and is confined in its range to the 
narrow tract of country between Costa Rica and the Isthmus of Darien. 
12. Turdus migratorius. Y 
Turdus migratorius, Linn. Syst. Nat. i. p. 292"; Licht. Preis-Verz. Mex. Vég. (1830), ef. J. f. Orn. 
1863, p. 57°; Scl. P. Z. S. 1856, p. 294°, 1858, p. 300*, 1859, p. 362°, 1864, p. 172°; Salv. 
& Scl. Ibis, 1860, p. 396"; Baird, Rev. Am. B. p. 28°; Sumichrast, Mem. Bost. Soc. N. H. 
p. 543°; Merrill, Pr. U. S. Nat. Mus. i. p. 118”. 
Planesticus migratorius, Gundl. Orn. Cub. p. 58”. 
Turdus migratorius, var. migratorius, Baird, Brew. & Ridg. N. Am. B. i. p. 25”. 
Turdus (Planesticus) migratorius, Coues, B. Col. Vall. i. p. 8”. 
Supra cinerascens, pileo, capitis lateribus et cauda nigricantibus; subtus castaneus, ventre imo et crisso albis, 
hoc fusco notato; gula alba nigro striolata; periophthalmio albo; rostro flavo apice corneo, pedibus 
corylinis. Long. tota 9-0, ale 5-0, caudee 3°7, rostri a rictu 1:1, tarsi 1-25. (Descr. maris ex La Parada, 
Mexico. Mus. nostr.) 
Hab. N. America! 1° 2 13._MeExico?, Rotosinapam (Sallé?), La Parada (Boucard*), 
Jalapa (de Oca*), Mountains of Orizaba (Sumichrast®), Mirador (Sartorius), 
Oaxaca (Menochio), valley of Mexico (White®, le Strange); GuatemaLa, Coban 
O. S.").—Cusa 1, 
The American Robin is a common bird in Mexico, where it is found throughout the 
