164 DwicnutT, Moult of Quatls and Grouse. Avi 
attwatert (Amer. Mus. No. 59539, Texas, April 25) is similar 
but even younger. 
Juvenal Plumage, acquired by a complete postnatal moult, 
which is overlapped by the postjuvenal moult before the birds 
are one half grown. This is illustrated by a young americanus 
(L. B. Bishop, No. 2070, North Dakota, July 5), which still 
retains natal down upon the head, throat, under surface of the 
wings, abdomen and legs. The first and second primaries are 
mere pin points, the third to eighth grown, the ninth a pin point 
and the tenth just expanding, the new ninth and tenth of course 
being part of the first winter plumage. The barred juvenal body 
plumage has been assumed elsewhere. Both males and females 
resemble adult females at this stage, being dusky above lined 
with white and barred with buff, the lower parts being dull white 
barred with dull black and buff, but neck tufts are lacking. 
First Winter Plumage, acquired by a complete postjuvenal 
moult excepting the two distal primaries. Young and old 
become practically indistinguishable. A specimen of cufido 
(J. Dwight, Jr., No. 4370, @, Martha’s Vineyard, Mass., Sept. 
29) is almost wholly in this dress, new feathers however still 
expanding upon the chin and throat while the third primary is 
only half grown. The rest of the remiges except some inner 
members of the series show few signs of immaturity. 
First Nuptial Plumage, acquired by a partial prenuptial moult, 
confined to the chin and head. A specimen of attwater? (Amer. 
Mus. No. 59538, Texas, April 25) shows a few new feathers grow- 
ing among the old on the sides of the head. 
Second or Adult Winter Plumage, acquired by a complete post- 
nuptial moult. 
Later plumages are repetitions of summer and winter dress. 
Pedicecetes phasianellus (Ziuv.). SHARP-TAILED GROUSE. 
ef i columbianus (Ord). COoLUMBIAN 
SHARP-TAILED GROUSE. 
Ke - _ campestris Aidgw. PRAIRIE SHARP- 
TAILED GROUSE. 
The material is limited, but it shows that the birds of this 
genus evidently moult like the other Grouse. 
