omys_ and _Thomomys_; however
the ecological affinities of the fragment here referred to _Cratogeomys_
sp. are unknown.

The more nearly tropical environment there could have occurred either
during a Wisconsin interglacial period or during the Sangamon
Interglacial age. _Heterogeomys onerosus_ perhaps lived near the cave
during an interglacial period; since then it became extinct or evolved
into the Recent species _Heterogeomys hispidus_. _Heterogeomys_ has not
previously been recorded from Pleistocene or earlier deposits.

LITERATURE CITED

BAKER, R. H.

1953. The pocket gophers (genus Thomomys) of Coahuila, Mexico.
Univ. Kansas Publ., Mus. Nat. Hist., 5:499-514, 1 fig. in
text, June 1.

CUSHING, J. E., JR.

1945. Quaternary rodents and lagomorphs of San Josecito Cave, Nuevo
Leon, Mexico. Jour. Mamm., 26:182-185, July 19.

FINDLEY, J. S.

1953. Pleistocene Soricidae from San Josecito Cave, Nuevo Leon,
Mexico. Univ. Kansas Publ., Mus. Nat. Hist., 5:633-639,
December 1.

HANDLEY, C. O., JR.

1955. _A new Pleistocene bat (_Corynorhinus_) from Mexico._ Jour.
Washington Acad. Sci., 45:48-49, March 14.

HOOPER, E. T.

1952. A systematic review of the harvest mice (genus
_Reithrodontomys_) of Latin America. Miscl. Publ. Mus. Zool.,
Univ. Michigan, 77:1-255, 9 pls., 24 figs., 12 maps, January
16.

JAKWAY, G. E.

1958. Pleistocene Lagomorpha and Rodentia from the San Josecito
Cave, Nuevo Leon, Mexico. Trans. Kansas Acad. Sci.,
61:313-327, November 21.

JONES, J. K., JR.

1958. Pleistocene bats from San Josecito Cave, Nuevo Leon, Mexico.
Univ. Kansas Publ., Mus. Nat. Hist., 9:389-396, 4 figs.,
December 19.

MILLER, L.

1943. The Pleistocene birds of San Josecito Cavern, Mexico. Univ.
California Publ. Zool., 47:143-168, April 20.

RUSSELL, R. J., and BAKER, R. H.

1955. Geographic variation in the pocket gopher, Cratogeomys
cantanops, in Coahuila, Mexico. Univ. Kansas Publ., Mus. Nat.
Hist., 7:591-608, 1 fig., March 15.

_Transmitted October 28, 1959._

28-1562

End of the Project Gutenberg EBook of Pleistocene Pocket Gophers From San
Josecito Cave, Nuevo Leon, Mexico, by Robert J. Russell

*** END OF THIS PROJECT GUTENBERG EBOOK PLEISTOCENE POCKET GOPHERS--MEXICO ***

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