Excerpt from North American Fauna, Vol. 8: No; 8; Monographic Revision of the Pocket Gophers Family Geomyidae The present paper is based on a study of the rich collection of Pocket Gophers belonging to the U. S. Department of Agriculture, comprising upwards of 800 specimens, exclusive of the genus Thomomys. This material has been supplemented by 110 specimens from my private coll lection, and a number from the U. S. National Museumfi making a total of about a thousand specimens, among which are by far the greater num ber of actual types known to be extant. The Department collection contains no less than 200 specimens from Mexico, most of which were secured by Mr. E. W. Nelson, a field naturalist of the Division. These, together with a few highly interesting specimens from Costa Rica and Guatemala in the U. S. National Museum, have enabled me not only to bring together for actual comparison all of the species previously described, and to add a considerable number heretofore unknown, but also to recognize several marked generic types Whose existence had not been suspected. Critical study of this unparalleled wealth of material has led to the discovery of some very remarkable dental peculiarities that have been deemed worthy of detailed description and illustration. Moreover, the opportunity has been utilized to contribute a chapter on the morphol ogy of the skull, which it is hoped will prove of service to those inter ested in the craniology of the Rodentia. 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.