200 
NORTH AMERICAN BIRDS. 
black, beneath more regularly and distantly barred with 
the same; quills, secondaries, and bend of wing white. 
Fall plumage: Ground-color of upper parts pale brownish, 
mixed with grayish, very minutely freckled and more 
coarsely vermiculated with dusky, the latter having a ten- 
dency to form irregular spots and coarser bars on back and 
scapulars; outermost wing-coverts, quills, and secondaries 
white; head and neck more fulvous and more distinctly 
barred with dusky; chest, upper breast, sides, and flanks 
colored and marked much like upper parts, but vermicula- 
tions more regular (forming distinct bars anteriorly), and 
black spots wholly wanting. Eggs 1.65 x 1.18, not with 
certainty distinguishable from) those of Z. lagopus, but 
usually less heavily spotted, or less densely speckled, the 
general aspect averaging lighter in color. Hab. Arctic 
America in general, except northern extremity of penin- 
sula of Labrador and region thence northward, Greenland, 
and the Aleutian Islands; southeastward to Gulf of St. 
Lawrence (Anticosti). 
302. L. rupestris (GmMEL.). Rock Ptarmigan. 
é. Summer male: Similar to corresponding stage of LD. rupestris, 
but less regularly and coarsely barred above. Summer fe- 
male: Above chiefly black, this varied irregularly with 
pale grayish buff, mostly in form of borders to the feathers 
and spots along their edges, or, occasionally, imperfect 
bars, these latter most distinct on wings, where the two 
colors are in about equal proportion; lower parts light 
grayish buff, everywhere coarsely barred with black. 
Young: Above light brown, irregularly barred and 
coarsely blotched with black, this prevailing on back, 
scapulars, and tertials; chest, breast, sides, and flanks 
with ground-color more buffy, this more regularly and 
coarsely barred with black; rest of lower parts dull white. 
Downy young: Similar to same stage of Z. lagopus, and 
perhaps not always distinguishable with certainty, but 
usually darker, with less of rusty tinge above, chestnut of 
crown darker, sides of head more strongly tinged with 
olive-grayish, black markings behind eye broader, and 
usually a black streak or spot under eye, which is appar- 
ently wanting in J. lagopus. Eggs 1.65 < 1.18, similar in 
color to those of ZL. rupestris. Hab. Greenland, islands 
on western side of Cumberland Gulf, and northern ex- 
tremity of Labrador (Ungava)........... 302a. L. rupestris 
reinhardti (Brrum). Greenland Ptarmigan. 
@. Ground-color of upper parts in summer male dark brownish gray. 
