20 TUEDID^. 



imo et crisso albis, subalaribus Isete cervinis; rostro fusco-nigro, pedibus fuscis. Long, tota 9*0, alee 4*9, 

 caudee 3-7, rostri a rictu 1-1, tarsi 1-2. (Desor. fern, ex Santa Fe, Panama. Mus. nostr.) 

 Juv. subtus paulo dilutior, pectoris plumis fusco maculatis, tectricibus alarum cervino terminatis. (Desor. av. 

 juv. ex Costa Eiea. Mus. nostr.) 



Hah. Costa Rica^ Cervantes (Carmiol^, M. L. Calleja^), Orosi, Volcan de Poas 

 {v. Frantzius ^) ; Panama *, Santa Fe (Arce^), Lion Hill (M'Leannan ^). 



This Thrush, which seems to be the northern form of the South- American Turdus 

 fumigatus, and still more nearly allied to the Amazonian T. hauxwelU, 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 ^, whence we have also received examples ^, 

 as well as from the neighbouring State of Costa, Eica ^, 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 Turdus ser- 

 ranus, the male of which is black ''. Mr. Lawrence, however ^, has always held to the 

 belief that the sexes do not differ in T. ohsoletus ; and all subsequent specimens received 

 tend to show that he is right in his opinion ^. The name ohsoletus, 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 ohsoletus appears to be nowhere common, and is confined in its range to the 

 narrow tract of country between Costa Eica and the Isthmus of Darien. 



12. Turdus migratorius. 



Tardus migratorius, Linn. Syst. Nat. i. p. 392 ' ; Licht. Preis-Verz. Mex. Vog. (1830), cf. J. f. Orn. 



1863, p. 57 ' ; Scl. P. Z. S. 1856, p. 394 \ 1858, p. 300 ', 1859, p. 363 % 1864, p. 173 ' ; Salv. 



& Scl. Ibis, 1860, p. 396"; Baird, Rev. Am. B. p. 38' ; 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. Vail. i. p. 8 "• 



Supra cirierascens, pileo, capitis lateribus et cauda nigricantibus ; subtus eastaneus, ventre imo et crisso albis, 

 Hoc fusco notato ; gula alba nigro striolata ; periopbthalmio albo ; rostro flavo apice corneo, pedibus 

 coryUnis. Long, tota 9*0, alse 5-0, caudse 3'7, rostri a rictu 1-1, tarsi 1-25. (Descr. maris ex La Parada, 

 Mexico. Mus. nostr.) 



Eah. N, AmebicaI ^o ^^ i3_ — Mexico 2, Eotosinapam {Salle% La Parada (Boucard^), 

 Jalapa {de Oca^), Mountains of Orizaba {Sumichrast^), Mirador {Sartorius^), 

 Oaxaca {Fenochio), valley of Mexico {White ^, le Strange); Guatemala, Coban 

 0. /S'.7).— Cuba h. 



The American Eobin is a common bird in Mexico, where it is found throughout the 



