957.

12. Geographic variation in the pocket gopher, Thomomys
bottae, in Colorado. By Phillip M. Youngman. Pp. 363-387,
7 figures in text. February 21, 1958.

13. New bog lemming (genus Synaptomys) from Nebraska. By J.
Knox Jones, Jr. Pp. 385-388. May 12, 1958.

14. Pleistocene bats from San Josecito Cave, Nuevo Leon,
Mexico. By J. Knox Jones, Jr. Pp. 389-396. December 19,
1958.

15. New Subspecies of the rodent Baiomys from Central
America. By Robert L. Packard. Pp. 397-404. December 19,
1958.

16. Mammals of the Grand Mesa, Colorado. By Sydney Anderson.
Pp. 405-414, 1 figure in text. May 20, 1959.

17. Distribution, variation, and relationships of the montane
vole, Microtus montanus. By Emil K. Urban. Pp. 415-511.
12 figs. in text, 2 tables. August 1, 1959.

More numbers will appear in volume 9.

(Continued on outside of back cover)

(Continued from inside of back cover)

Vol. 10. 1. Studies of birds killed in nocturnal migration. By
Harrison B. Tordoff and Robert M. Mengel. Pp. 1-44, 6
figures in text, 2 tables. September 12, 1956.

2. Comparative breeding behavior of Ammospiza caudacuta and
A. maritima. By Glen E. Woolfenden. Pp. 45-75, 6 plates,
1 figure. December 20, 1956.

3. The forest habitat of the University of Kansas Natural
History Reservation. By Henry S. Fitch and Ronald R.
McGregor. Pp. 77-127, 2 plates, 7 figures in text, 4
tables. December 31, 1956.

4. Aspects of reproduction and development in the prairie
vole (Microtus ochrogaster). By Henry S. Fitch. Pp.
129-161, 8 figures in text, 4 tables. December 19, 1957.

5. Birds found on the Arctic slope of northern Alaska. By
James W. Bee. Pp. 163-211, pls. 9-10, 1 figure in text.
March 12, 1958.

6. The wood rats of Colorado: distribution and ecology. By
Robert B. Finley, Jr. Pp. 213-552, 34 plates, 8 figures
in text, 35 tables. November 7, 1958.

More numbers will appear in volume 10.

Vol. 11. 1. The systematic status of the colubrid snake, Le