Excerpt from University of California Publications in Zoology, 1913-1916, Vol. 12: With 22 Plates In the series indicated above there is but slight variation in shade of gray of underparts, the winter birds from the San Joaquin Valley, California, being of precisely the same hue as winter birds from the East. As regards color patterns, the following unusually marked birds are the only variants in the series. Three specimens (nos. 21962, 21949, 21952) show slight traces of a white half collar at base of neck, and two (nos. 21962, 21972) have a few small black spots on center line of throat, the white cheek patches being otherwise continuous with one another across throat, but in no instance are these differences sufficiently marked to cause hesitancy in placing the birds in the canadensis category. Of the thirty-nine specimens in which I was able to count the number of tail feathers, one had fourteen rectrices, nine had sixteen, twenty-three had eighteen and six had twenty. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.