i Dwicut, Moult of Quails and Grouse. 143 
THE MOULT OF THE NORTH AMERICAN ZETZ- 
RAONID (QUAILS, PARTRIDGES AND 
GROUSE). 
BY JONATHAN DWIGHT, JR., M.D. 
Plates IV and V. 
(Concluded from page 51.) 
Dendragapus obscurus (Say). Dusky GRousE. 
ae cf fuliginosus. Ridgw. Soory Grouse. 
Ke a richardsonii (Dowg/.). RICHARDSON’S 
GROUSE. 
The material examined, although not very extensive, shows the 
same sequence of plumages and moults as among the Quails. 
Natal Down. — Above rich buff mottled with black and spotted 
with black on the forehead and sides of the head. Below dull 
buffy white. Two specimens of obscurus (Amer. Mus. Nos. 63989 
and 63990, Utah, June 15) are mere chicks; but much of the juve- 
nal plumage has grown on the upper surface and the first and 
second primaries are just in sight, the others being far more 
advanced, while the tail is also visible. 
Juvenal Plumage, acquired by a complete postnatal moult. 
Above grayish brown with buff or whitish shaft-streaks and 
irregular barring or mottling of black, buff and gray; the crown 
reddish tinged. Below chiefly white with a thick sprinkling of 
black spots except on the chin. Two specimens of /uiginosus, 
about half grown (Amer. Mus. Nos. 45275 and 45276, July 12 
and 13, British Columbia), illustrate this plumage and the early 
appearance of the postjuvenal moult, the first and second pri- 
maries still growing while the seventh to the tenth have been 
already renewed. 
first Winter Plumage, acquired by a complete postjuvenal 
moult, excepting the two distal primaries of each wing. A dress 
practically adult is assumed at this stage. 
First Nuptial Plumage. — There is no material showing prenup- 
tial moult, but it must be very restricted, judging by breeding 
