ae | Dwicut, Moult of North American Shore Birds. 37y 
worn specimen from South America (Am. Mus. Nat. Hist. No. 
71427 September 14 Colombia). 
3. first Winter Plumage acquired apparently wholly by wear, 
by which the upper parts become uniformly olive green without 
edgings except a few dusky bars on the wing-coverts. It is con- 
venient to call this stage the winter dress, and to consider the 
postjuvenal moult as suppressed in this species. There are many 
Passerine birds in which the nuptial or breeding plumage is 
simply the autumnal dress modified by wear, and if we are justi- 
fied in calling a worn autumnal or winter plumage, the breeding 
_dress of these birds, so we are justified in calling a worn juvenal 
plumage, the first winter plumage. Whatever we choose to name 
it, it is worn at least until the beginning of January, as proved by 
numerous October, November and December specimens, of which, 
among many with incomplete data, I may cite the following as 
apparently young birds: Amer. Mus. Nat. Hist. No. 51294, 
3, December 8, Arizona; U.S. Nat. Mus. No. 86420, 2, January 
6, Lower California; U. S. Nat. Mus. No. 120277, 9, January 3, 
Honduras. 
4. First Nuptial Plumage acquired by a prenuptial moult 
probably complete, as indicated by a number of specimens, some 
unfortunately without dates. While it is possible that some of 
these birds which show actual feather growth, especially of the 
remiges, are adults, it is not at all probable, judging by their 
plumage and by the usual scarcity of adults at any season. The 
following serve to prove the occurrence of a complete moult, viz., 
U.S. Nat. Mus. No. 169037, 9, February 9, Culebra Island, has 
renewed the primaries, except the worn distal one, the rectrices 
and body plumage being mostly old and worn; U. S. Nat. Mus. 
No. 74051, ¢, February, St. Vincent Island, West Indies, retains 
two old distal primaries, tail and body plumage; U.S. Nat. Mus. 
No. 81016, g, [no date], St. Thomas Island, W. I., has the rem- 
iges and part of the rectrices still in their sheaths, and new 
nuptial feathers among those of the worn body plumage; and 
U.S. Nat. Mus. No. 80973, g, [no date] St. Eustatius Island, 
W. I., retains still four old primaries, but new body feathers are 
growing at several points. 
Specimens in abundance from Florida and Arizona, taken in 
