1894. A monograph of the bats of North America. Bull. U. S. Nat. Mus., 43:ix + 198, 38 pls., March 14. ALLEN, J. A. 1881. _List of mammals collected by Dr. Edward Palmer in northeastern Mexico, with field-notes by the collector._ Bull. Mus. Comp. Zool., 8:183-189, March. 1891. _On a collection of mammals from southern Texas and northeastern Mexico._ Bull. Amer. Nat. Hist., 3:219-229, December. 1891. A preliminary study of the North American opossums of the genus Didelphis. _Ibid._, 14:149-188, 4 pls., June 15. ALVAREZ, T. 1961. Taxonomic status of some mice of the Peromyscus boylii group in eastern México, with description of a new subspecies. Univ. Kansas Publ., Mus. Nat. Hist., 14:111-120, 1 fig., December 29. 1962. A new subspecies of ground squirrel (Spermophilus spilosoma) from Tamaulipas, México. _Ibid._, 14:121-124, March 7. ANDERSON, S. 1956. Extensions of known ranges of Mexican bats. _Ibid._, 9:347-351, August 15. ANTHONY, H. E. 1923. Mammals from Mexico and South America. Amer. Mus. Novit., 54:1-10, 2 figs., January 17. BAILEY, V. 1895. Biological survey of Texas. N. Amer. Fauna, 25:1-222, 23 figs., 8 pls., October 24. BAIRD, S. T. 1855. _Characteristics of some new species of Mammalia, collected by the U. S. and Mexican Boundary Survey, Major W. H. Emory, U. S. A. Commissioner._ Proc. Acad. Nat. Sci. Philadelphia, 7:331-333, April. 1858. Mammals. _In_ General report upon the Zoology of the Several Pacific railroad routes. U. S. P. R. R. Exp. and Surveys, pp. xlviii + 757, 60 pls., July 14. BAKER, R. H. 1951. Mammals from Tamaulipas, México. Univ. Kansas Publ., Mus. Nat. Hist., 5:207-218, December 15. 1956. Mammals of Coahuila, México. _Ibid._, 9:125-335, 75 figs., June 15. 1958. El futuro de la fauna silvestre en el norte de México. Anal. Inst. Biol., México, 28:349-357, June 14. BAKER, R. H., and VILLA R., B. 1960. Distribución geographica y población actuales del lobo gris en México. _Ibid._, 30:369-374, 1 map, March 31. BOOTH, E. S. 1957. Mammals collected in Mexico from 1951 to 1956 by the Walla Walla College Museum of Natural History. Walla Walla College Publ., 20:1-19, 3 maps, July 10. BURT, W. H. 1959. The history and affinities of the Recent land mammals of western North America. _In_ Zoogeography. Amer. Assoc. Adv. Sci. Publ., 116, February 10. BURT, W. H., and STIRTON, R. A. 1961. The mammals of El Salvador. Misc. Publ. Mus. Zool., Univ. Michigan, 117:1-69, 2 figs., September 22. CARTER, D. C., and DAVIS, W. B. 1961. _Tadarida aurispinosa_ (Peale) (Chiroptera: Molossidae) in North America. Proc. Biol. Soc. Washington, 74:161-165, August 11. DALQUEST, W. W. 1951. Two new mammals from Central Mexico. _Ibid._, 64:105-107, August 24.