23. Speciation and evolution of the pygmy mice, genus Baiomys. By Robert L. Packard. Pp. 579-670, 4 plates, 12 figures in text. June 16, 1960. Index. Pp. 671-690. (Continued on inside of back cover) UNIVERSITY OF KANSAS PUBLICATIONS MUSEUM OF NATURAL HISTORY Volume 14, No. 15, pp. 363-473, 5 figs. May 20, 1963 The Recent Mammals of Tamaulipas, México BY TICUL ALVAREZ UNIVERSITY OF KANSAS LAWRENCE 1963 UNIVERSITY OF KANSAS PUBLICATIONS, MUSEUM OF NATURAL HISTORY Editors: E. Raymond Hall, Chairman, Henry S. Fitch, Theodore H. Eaton, Jr. Volume 14, No. 15, pp. 363-473, 5 figs. Published May 20, 1963 UNIVERSITY OF KANSAS Lawrence, Kansas PRINTED BY JEAN M. NEIBARGER, STATE PRINTER TOPEKA, KANSAS 1963 29-4228 The Recent Mammals of Tamaulipas, México BY TICUL ALVAREZ CONTENTS Page INTRODUCTION 365 PHYSIOGRAPHY 366 CLIMATE 368 AFFINITIES OF TAMAULIPAN MAMMALS 370 PLANT-MAMMAL RELATIONSHIPS 371 BARRIERS AND ROUTES OF MOVEMENT 376 HISTORY OF MAMMALOGY 379 CONSERVATION 381 METHODS AND ACKNOWLEDGMENTS 384 GAZETTEER 386 CHECK-LIST 388 ACCOUNTS OF SPECIES AND SUBSPECIES 393 LITERATURE CITED 467 INTRODUCTION From Tamaulipas, the northeasternmost state in the Mexican Republic, 146 kinds of mammals, belonging to 72 genera, are here reported. Mammals that are strictly marine in habit are not included. The state is crossed in its middle by the Tropic of Cancer. Elevations vary from sea level on the Golfo de México to more than 2700 meters in the Sierra Madre Oriental; most of the state is below 300 meters in elevation. Its area is 79,602 square kilometers (30,732 square miles). Tamaulipas, meaning "lugar en que hay montes altos" (place of high mountains), was explored in 1516 by the Spaniard Francisco Fernández de Córdoba, but it was not until the 18th century that José de Escandón established several villages in the new province of Nueva Santender from which, in the time of Iturbide's Empire, Tamaulipas was separated as a distinct political entity, with about the same boundaries that it now has.