Young. Similar to the adult, but much mixed with whitish medially beneath; this in form of longitudinal suffusions.
Autumnal and winter specimens have numerous transverse crescents of whitish on lower parts and wings,—these very especially conspicuous posteriorly; the secondaries are also conspicuously terminated with a white crescent. Bill brown, paler toward base of lower mandible. In spring and summer the bill entirely black, and the whitish markings almost entirely disappear; the young bird has a greater amount of white beneath than the adult in winter dress, and this white is disposed in longitudinal, not transverse, suffusions. The color of the legs appears to be the same at all seasons.
PLATE V.
1. Cinclus mexicanus, Sw. N. M., 8496.
2. Sialia mexicana, Sw. Cal., 10623.