Excerpt from Revision of the Avian Genus Passerella: With Special Reference to the Distribution and Migration of the Races in California The Museum Of Vertebrate Zoology has gradually acquired a fairly extensive representation of fox sparrows, mostly collected by various field expeditions. This collection consists in part of. Series of most of the subspecies collected upon their breeding grounds, in part of miscellaneous non-breeders of various subspecies, taken as migrants and winter visitants. Of late years it has become increasingly difficult to coordinate the museum arrangement of many of these specimens with current classifications and descriptions. Inconsistencies were apparent but the remedy was not so readily seen. At the same time the Museum was being called upon constantly to identify specimens, sometimes single birds, sometimes extensive series, sent in for this purpose by collectors in various parts of the state; while every effort was made to satisfy such requests, the questions asked could not always be satisfactorily answered. It seemed desirable to bring together as large a series of Passerella as was to be had, in expectation that careful study of material known to be available would, among other things, permit of a clearer defini tion of the subspecies and their characteristics than had yet been put forth. This study has proven far more complicated than was at first apparent, and while I feel that it has resulted in a much clearer perception of the nature of the problem, I cannot assume to have finally disposed of many of the questions involved. 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.