A eA PROCEEDINGS OF THE NATIONAL MUSEUM. 317 
Turdus obscurus GM. (262) 
According to the account given by Blakiston and Pryer, this species, 
although of regular occurrence, must be comparatively rare in Japan. 
It has hitherto not been found in Yezo (Blakist., Amend. List B. Jap., 
p. 26), and Mr. Henson’s specimen (No. 1274, 2 juv.; Hakodate, Octo- 
ber 10, 1882) is therefore of particular interest as extending the range 
of this species into the Northern Island. (U.S. Nat. Mus. No. 120338.) 
The seareity of the Eyebrowed Thrush in the northern portions of 
Japan is very remarkable, when we consider that it is common in Kam- 
tehatka. 
Cichloselys* sibiricus (PALL.). (258) 
The Siberian Thrush is comparatively rare in Japan, but is found 
sparingly breeding at least in Hondo. Its occurrence in Yezo has not 
been recorded with certainty, and Blakiston (Amend. List B. Jap., p. 
26) enumerated it among the ‘Species not found in Yezo or the Kurils.” 
Mr. Henson, however, has been so fortunate as to secure specimens at 
Hakodate in June, both in 1884 and 1885 (No. 83, ¢ , June 3, 1884; No. 
159, 2, June 22, 1885). (U.S. Nat. Mus. Nos. 120339-40.) 
The male has not quite obtained its final plumage, for the wing is 
still more or less tinged with fulvous, and the chin is white, in fact 
closely resembling a breeding male collected by Mr. Jouy at Fuji, July 
14, 1882 (U.S. Nat. Mus., No. 88609). The female is a fully adult bird 
characterized by the very pronounced plumbeous cast of the back, and 
by the median upper wing-coverts being uniform and not marked with 
the buffy deltoid spots characteristic of the bird of the year. 
Mr. Seebohm, in the fifth volume of the British Museum Catalogue, 
gives Turdus auroreus PALLAS as the female of the present species, 
following Gloger, Brehm, and Gray. Looking apart from the locality, 
Kadiak, as indicated by Pallas, the following points of his description 
can not be reconciled with sibericus: ‘“‘Subtus tota ferrugineo-lutea, 
*The ‘Siberian Thrush” has the wing constructed somewhat differently from that 
ef the other Japanese Thrushes. The second primary, as a rule, is very long, nearly, 
or quite, as long as the fourth; second, third, and fourth: thus forming the tip of 
of the wing. Furthermore, it has only the third and fourth primaries sinuated in 
the outer webs toward the tips, while in the other Thrushes the fifth is also usually 
sinuated. The tail in the present species is conspicuously rounded, against square, 
or nearly so, in the others. With these structural differences there is also associated 
a peculiar pattern of coloration, especially of the under surface of the wing, which 
induced Mr. Seebohm to inelude it in the genus Geocichla, in which he also puts 
Oreocincla. To the latter C. sibiricus has undoubtedly nearer relationship than to 
Turdus, though there seems to be enough structural characters to warrant the separa- 
tion of Cichlcselys and Oreocincla. 
The name Cichloselys was originally applied by Bonaparte to a heterogeneous 
assemblage of Turdine birds belonging to different groups at that time already 
named. Since he has not indicated any particular species as type, I feel justified 
(A. O. U. Code, Canons XXI, XXIV) in restricting the name to the only species of 
the group requiring a separate name. 
