Material referable to _Thomomys_ consists of a nearly complete cranium, L.A.C.M. (C.I.T.) No. 3952, with nasals, maxillary teeth, and lower parts of braincase missing and zygomata broken; four rami (unnumbered), one of which is badly broken; and two isolated molariform teeth. The skull has a sphenoidal fissure, a feature typical of the _umbrinus_ group of _Thomomys_. The fossil specimens closely approximate in size the living subspecies _Thomomys umbrinus analogus_ Goldman. _Thomomys_ is not known from the vicinity of the cave at the present time and has not been reported from southwestern Nuevo Leon, even though there has been extensive collecting for pocket gophers there in recent years. To my knowledge the nearest record of occurrence of modern _Thomomys_ is a series of _Thomomys umbrinus analogus_ from 12 miles east of San Antonio de las Alazanas at an elevation of 9000 feet in the state of Coahuila (Baker, 1953:511), approximately 85 miles to the northwest. The fossil gophers are not from the talus of the cave floor, which is evidently of subrecent origin, but from the Pleistocene deposits below. Close resemblance to the living subspecies _T. u. analogus_, however, indicates that these remains are not so old as some of the other geomyid fossils from the cave. #Cratogeomys castanops# (Baird) Seven rami pertain to the genus _Cratogeomys_. All except three, L.A.C.M. (C.I.T.) Nos. 2974, 2978, and 3954, lack cheek teeth and the posterior processes are missing on most of the mandibles. No. 2974 is smaller than the other specimens, and probably is from a young individual. No. 3954 may have been fossilized at an earlier date than the other six jaws; however, it is comparable to them in size and morphology. Also present in the deposits are three limb bones of _Cratogeomys castanops_. One, a right humerus bearing L.A.C.M. (C.I.T.) No. 2982, is slightly larger than that of the pocket gophers living in the area now. Two tibias, L.A.C.M. (C.I.T.) Nos. 2983 and 2984, complete the material referable to this species. _Cratogeomys castanops planifrons_ (see Russell and Baker, 1955:607) occurs in the immediate vicinity of San Josecito today. None of the rami from the cave differs appreciably from those of the _subnubilus_ group of _Cratogeomys castanops_, a group of small subspecies including _planifrons_, _subnubilus_, _rubellus_ and _peridoneus_. All are small in external measurements and skull and differ markedly in this respect from the group of large subspecies (the _subsimus_ group) that occurs farther northward in Coahuila and Nuevo Leon. #Cratogeomys# sp.