Part 21 (1/2)

By John A. White. Pp. 259-262. April 10, 1952.

20. A new pinon mouse (Peromyscus truei) from Durango, Mexico.

By Robert B. Finley, Jr. Pp. 263-267. May 23, 1952.

21. An annotated checklist of Nebraskan bats. By Olin L. Webb and J. Knox Jones, Jr. Pp. 269-279. May 31, 1952.

22. Geographic variation in red-backed mice (Genus Clethrionomys) of the southern Rocky Mountain region. By E. Lendell c.o.c.krum and Kenneth L. Fitch. Pp. 281-292, 1 figure in text.

November 15, 1952.

23. Comments on the taxonomy and geographic distribution of North American microtines. By E. Raymond Hall and E. Lendell c.o.c.krum. Pp. 293-312. November 17, 1952.

24. The subspecific status of two Central American sloths. By E. Raymond Hall and Keith R. Kelson. Pp. 313-337.

November 21, 1952.

25. Comments on the taxonomy and geographic distribution of some North American marsupials, insectivores, and carnivores.

By E. Raymond Hall and Keith R. Kelson. Pp. 319-341.

December 5, 1952.

26. Comments on the taxonomy and geographic distribution of some North American rodents. By E. Raymond Hall and Keith R.

Kelson. Pp. 343-371. December 15, 1952.

27. A synopsis of the North American microtine rodents. By E. Raymond Hall and E. Lendell c.o.c.krum. Pp. 373-498, 149 figures in text. January 15, 1953.

28. The pocket gophers (Genus Th.o.m.omys) of Coahuila, Mexico.

By Rollin H. Baker. Pp. 499-514, 1 figure in text.

June 1, 1953.

29. Geographic distribution of the pocket mouse, Perognathus fasciatus. By J. Knox Jones, Jr. Pp. 515-526, 7 figures in text. August 1, 1953.

30. A new subspecies of wood rat (Neotoma mexicana) from Colorado. By Robert B. Finley, Jr. Pp. 527-534, 2 figures in text. August 15, 1953.

31. Four new pocket gophers of the genus Cratogeomys from Jalisco, Mexico. By Robert J. Russell. Pp. 535-542.

October 15, 1953.

32. Genera and subgenera of chipmunks. By John A. White.

Pp. 543-561, 12 figures in text. December 1, 1953.

33. Taxonomy of the chipmunks, Eutamias quadrivittatus and Eutamias umbrinus. By John A. White. Pp. 563-582, 6 figures in text. December 1, 1953.

34. Geographic distribution and taxonomy of the chipmunks of Wyoming. By John A. White. Pp. 584-610, 3 figures in text.

December 1, 1953.

35. The baculum of the chipmunks of western North America.