ia | Dwicut, Moult of North American Shore Birds. 383 
September 7, North China, has renewed the flight feathers and 
only part of the body plumage. Among the many specimens 
examined in the gray and white dress, which results from this 
moult, there are few that can be identified with certainty as 
adults, both young and old, males and females, being practically 
indistinguishable in winter dress. 
6. Second or Adult Nuptial Plumage acquired by a prenuptial 
moult which does not appear to involve the wings nor the tail 
with the exception of the tertiaries and a few wing-coverts. 
What has already been said of the first nuptial plumage applies 
_equally well to the second or third, and the specimens there men- 
tioned may, some of them, be adults. One other that I believe 
to be an adult (Amer. Mus. Nat. Hist. No. 29888, @, April 13, 
South Carolina) is acquiring new body feathers, the wings, tail 
and tertiaries much worn. 
Two other species that on account of similarity of plumage 
may well be considered together are the following: 
AMERICAN GOLDEN PLOVER (Charadrius dominicus). 
BLACK-BELLIED PLOVER (Charadrius squatarola). 
1. Matal Down. Mottled above, yellowish below. 
2. Juvenal Plumage acquired by a complete postnatal moult. 
Extra-limital specimens of C. dominicus in this plumage are 
the following, viz.; Am. Mus. Nat. Hist. No. 30856, August, 
Bolivia, and eight birds from Brazil taken between October 
s and November 14. Specimens of C. sgwatarola are the follow- 
ing, viz.: Am. Mus. Nat. Hist. No. 61634, 2, October 25, 
France; No. 61633, November 9, Amoy, China; U. S Nat. 
Mus. No. 119351, g¢, December 26, West Indies. 
3. First Winter Plumage acquired by a partial postjuvenal 
moult late in the fall which involves only the body plumage. ~ 
No. 61634 just cited shows an early stage. The winter dress is 
deep gray above (yellow-tinged in C. dominicus) and chiefly white 
below, indistinctly mottled on the breast and not differing greatly 
in the two species. 
4. First Nuptial Plumage acquired by a prenuptial moult that is 
