1 alee Dwicut, Moult of Quails and Grouse. 163 
which distinguish them from young birds and from females. 
- The coming of this dress is illustrated by several September birds 
(Amer. Mus. No. 67877, ¢, and No. 67880, 9, Alaska, Septem- 
ber 15) which have recently acquired new first and second pri- 
maries at the end of the postnuptial moult and are assuming 
many new white feathers about the head and on the back, by the 
supplementary moult. 
Second or Adult Nuptial Plumage, acquired by a prenuptial 
moult, limited to the body plumage, as in the young bird. 
Later plumages and moults are similar to those already described 
and occur in definite sequence. 
Lagopus evermanni Z//z0ot, EvERMANN’S PTARMIGAN. 
ce welchi Brewst. WELCH’s PTARMIGAN. 
“ leucurus Swans. & Rich. WHITE-TAILED PTARMIGAN. 
I have seen too few specimens of these species to enable me 
to trace their sequence of plumages and moults, but those I 
have examined indicate the same changes as in /agofus or rupes- 
tris. L. leucurus becomes absolutely white in winter, the tail 
being white at all seasons except in the gray juvenal stage. 
Tympanuchus americanus (feich.). PRAIRIE HEN. 
t i attwateri (Bendire). ATTWATER’S 
PRAIRIE HEN. 
a cupido (Zi.). HeratH HEN. 
cs pallidicinctus A7dgw. LESSER PRAIRIE HEN. 
The usual sequence of moults and plumages prevails in this 
genus, the species of which need not be discussed separately. 
Natal Down.— The bright tints of the lower parts of the 
chicks is characteristic, no other members of the Tetraonidz 
approaching so nearly a canary yellow. Above they are mottled 
with rusty brown and dull black, spots of black also occurring 
on the nostrils, crown and behind the eyes. A chick of amerv- 
canus (L. B. Bishop, No. 1968, North Dakota, June 12) shows the 
remiges and coverts partly grown, but the first and second pri- 
maries are not yet visible; elsewhere down prevails except a few 
juvenal feathers appearing in the humeral tracts. A chick of 
