eae PROCEEDINGS OF THE NATIONAL MUSEUM. 519 
present unable to say. It seems as if the name Monticola pandoo 
(SYKES) is available for this form. 
Sharpe and Dresser (tom. cit., p. 161) indicate the possibility that the 
Rock Thrush from Japan may turn out to be a different species—char- 
acterized by a greater brilliancy of coloration and longer tarsus. With- 
out specimens from the Philippine Islands it is difficult for me to form 
an opinion. All I can say is that I find no essential difference in pro- 
portion or coloration between Japanese, Liukiuan, Formosan, Chinese, 
and Corean examples. Eleven specimens from China, Corea, and For- 
mosa vary in the wing between 115" and 128"™ (average 122™™) and in 
the tarsus between 28™™ and 31"™ (average 30™"), while fourteen spec- 
imens from Japan and Liukiu measure in the wing 116™™ to 128™m™ 
(average 122™™) and in the tarsus 29™™ to 32™™ (average 30™™), 
Mr. Seebohm (Cat. B. Brit. Mus., v, p. 320) asserts that “males of 
the year scarcely differ from adult females, except in having the ground- 
color of the under parts, especially on the breast and belly, tinged with 
blue.” In this I think he is wrong, for the material before me clearly 
indicates that the young male in the first autumn is essentially like the 
adult male at the corresponding season. To substantiate this asser- 
tion I select from my series four males collected in September and No- 
vember, viz: 
6; Jouy Coll., No. 1177; Chemulpo, Corea, September 7, 1883. 
6; U.S. Nat. Mus., No. 86141; Hongkong, China, November 12, 1881; 
Jouy Coll. 
3; U.S. Nat. Mus., No. 85830; Kowloon, China, September 28, 1881; 
Jouy Coll. 
$6; U.S. Nat. Mus., No. 85831; Amoy, China, September 18, 1881; 
Jouy Coll. 
The first two specimens at once proclaim themselves as young birds 
by the comparatively abraded condition of wings and tails. In the 
young birds the remiges and rectrices remain from the first plum- 
age, and are not shed in autumn, as in the old birds; hence the fresher 
condition of these feathers in the latter. I need hardly add that the 
comparatively abraded quills here spoken of are not those of old birds 
with these feathers yet unmolted, for in that case they would have been 
uniform blackish with dark bluish edges and no white, while those I 
refer to have very broad and light edges, white at the tips. The con- 
dition of the quills at this season isa certain indication of the age of 
the bird when no trace of the first plumage is left. Sucha trace, how- 
ever, is still visible in the Corean example enumerated above, for this 
specimen has on each tail-feather (central pair absent) a rufous, some- 
what heart-shaped, but ill-defined spot near the tip, separated from the 
broad terminal margin of similar color by a blackish line. Inthe Hong- 
kong specimen traces of the same are still visible, but the tail is more 
abraded. The yery fresh condition of the corresponding quills in the 
two other specimens testifies to their having been but recently acquired ; 
the birds are consequently more than a year old. 
