17. Pliocene and Pleistocene records of fossil turtles from western Kansas and Oklahoma. By Edwin C. Galbreath. Pp. 281-284, 1 figure in text. August 16, 1948. 18. A new species of heteromyid rodent from the Middle Oligocene of northeast Colorado with remarks on the skull. By Edwin C. Galbreath. Pp. 285-300, 2 plates. August 16, 1948. 19. Speciation in the Brazilian spiny rats (Genus Proechimys, Family Echimyidae). By Joao Moojen. Pp. 301-406, 140 figures in text. December 10, 1948. 20. Three new beavers from Utah. By Stephen D. Durrant and Harold S. Crane. Pp. 407-417, 7 figures in text. December 24, 1948. 21. Two new meadow mice from Michoacan, Mexico. By E. Raymond Hall. Pp. 423-427, 6 figures in text. December 24, 1948. 22. An annotated check list of the mammals of Michoacan, Mexico. By E. Raymond Hall and Bernardo Villa-R. Pp. 431-472, 2 plates, 1 figure in text. December 27, 1949. 23. Subspeciation in the kangaroo rat, Dipodomys ordii. By Henry W. Setzer. Pp. 423-573, 27 figures in text, 7 tables. December 27, 1949. 24. Geographic range of hooded skunk, Mephitis macroura, with description of a new subspecies from Mexico. By E. Raymond Hall and Walter W. Dalquest. Pp. 575-580, 1 figure in text. January 20, 1950. 25. Pipistrellus cinnamomeus Miller 1902 referred to the genus Myotis. By E. Raymond Hall and Walter W. Dalquest. Pp. 581-590, 5 figures in text. January 20, 1950. 26. A synopsis of the American bats of the genus Pipistrellus. By E. Raymond Hall and Walter W. Dalquest. Pp. 591-602, 1 figure in text. January 20, 1950. Index pp. 605-638. The Pocket Gophers (Genus Thomomys) of Utah BY STEPHEN D. DURRANT University of Kansas Publications Museum of Natural History Volume 1, No. 1, pp. 1-82, 1 figure in text August 15, 1946 UNIVERSITY OF KANSAS LAWRENCE 1946 The Pocket Gophers (Genus Thomomys) of Utah BY STEPHEN D. DURRANT University of Kansas Publications Museum of Natural History Volume 1, No. 1, pp. 1-82, 1 figure in text August 15, 1946 UNIVERSITY OF KANSAS LAWRENCE 1946 UNIVERSITY OF KANSAS PUBLICATIONS, MUSEUM OF NATURAL HISTORY Editors: E. Raymond Hall, Chairman, Donald S. Farner, Donald F. Hoffmeister Volume 1, No. 1, pp. 1-82, 1 figure in text. Published AUGUST 15, 1946 UNIVERSITY OF KANSAS Lawrence, Kansas PRINTED BY FERD VOILAND, JR., STATE PRINTER TOPEKA, KANSAS 1946 21-2786 The Pocket Gophers (Genus Thomomys) of Utah By STEPHEN D. DURRANT Contribution from the Department of Biology, University of Utah, and the Museum of Natural History, University of Kansas. INTRODUCTION