_Preptoceras_, _Smilodon_, and _Aenocyon_ (all
Pleistocene genera) are present. According to Miller's (_loc. cit._:145)
extensive report on the avifauna, the bird remains from the cave are a
remarkable assemblage and beautifully preserved. Most of the mammalian
remains have been studied in detail, and the results of these studies
have been published in a number of papers each treating specific groups.
These reports provide valuable information concerning the distribution
of mammals in northeastern Mexico in the late Pleistocene, a knowledge
of which is most important to an understanding of present patterns of
distribution and evolution of Mexican mammals.

Cushing's (1945:182-185) report on his study of the rodents and
lagomorphs includes a description of an extinct pygmy species of rabbit,
_Sylvilagus leonensis_. He records three kinds of pocket gophers from
San Josecito; Cushing was able to separate the genus Thomomys from two
unidentified geomyids (_loc. cit._:185). These prove to belong to the
genera _Cratogeomys_ and _Heterogeomys_; the materials are described
below. Cushing records also larger mammals, including the antilocaprid
(_Stockoceros conklingi_), saber-toothed cat (_Smilodon_), dire wolf
(_Aenocyon_), a large oviboid (_Preptoceras_), and deer (_loc.
cit._:182).

More recently Findley (1953:633-639) has written on the remains of the
family Soricidae taken from the cave, and Hooper (1952:59) has studied
the bones of the genus _Reithrodontomys_ and found them not different
from those of _R. megalotis_ that inhabits the region of the cave today.
Handley (1955:48) has described a new species of plecotine bat,
_Corynorhinus tetralophodon_, from the collection. Jones (1958:389-396)
published an account of the bats of San Josecito, and described a new
vampire bat, _Desmodus stocki_, from the cave. Jakway (1958:313-327) has
reported on the lagomorphs and rodents in detail, and compared this part
of the cave fauna with that of Rancho La Brea and Papago Spring Cave,
Arizona. Jakway (_lit. cit._:323-324) suggests that the fauna from San
Josecito is late Pleistocene, probably contemporaneous with the remains
from Papago Spring Cave and pre-Rancholabrean.

I thank Professor E. Raymond Hall and Dr. Robert W. Wilson for
their permission to examine this material and for critical comments
and advice on the manuscript. The drawings were made by Miss Lucy
Remple. The specimens are a part of the collection of f