Auk 
48 Dwicut, Moult of Quatls and Grouse. fea. 
family. Young and old become indistinguishable and males 
and females may now be told apart by the plumage for the first 
time. 
First Nuptial Plumage, acquired by an incomplete prenuptial 
moult restricted to the head and throat, an occasional new feather 
showing elsewhere. There are a number of birds of both sexes 
with new feather growth apparent in April and May. 
Second or Adult Winter Plumage, acquired by a complete post- 
nuptial moult which is well illustrated by specimens; a male 
from Arizona (Am. Mus. No. 56526, August 15) has renewed 
seven primaries and eight secondaries, together with half grown 
median rectrices, and much of the body plumage except part of 
breast, nape, head, throat and chin and some of the back and 
rump; two females from the same locality (Am. Mus. No. 56527, 
Aug. 26, and No. 56529, Sept. 6) are both less advanced, only 
the ninth and tenth primaries being new. Later plumages and 
moults are repetitions of earlier ones. ‘ 
Callipepla californica (Saw). CALIFORNIA PARTRIDGE. 
se ee vallicola Ridg. VALLEY PARTRIDGE. 
The two forms of this bird are fairly represented by specimens 
I have examined. 
Downy Plumage.— Above, rich brown, mottled on the sides 
with dusky brown; a dark line behind the eye. Below, dull 
white somewhat tinged with buff. The form vad/cola is possibly 
grayer at this stage. The chicks are not very obviously different 
from those of Oveortyx. 
* Juvenal Plumage, acquired by a complete postnatal moult. 
Above grayish brown with dusky and whitish edgings on the 
back and wing-coverts; nape gray with faint whitish shaft-streaks 
and dusky edgings. Below, gray with whitish edgings, producing 
a barred effect. A California bird (Amer. Mus. No. 61062, 9, 
July 3) still retains the downy head, the first or distal primary is 
a mere pin feather, the second is half grown, the third and fourth 
show remains of their follicles, and the rest are grown except the 
inner members of the series. A female (Amer. Mus. No. 61063, 
