The Sierra del Carmen is a high, igneous range, surrounded for the most part by Lower Sonoran plains and desert. Zoologically, these mountains are poorly known. Few collectors have been in the area; most of these have been afforded accommodations through the Club Sierra del Carmen (Carmen Mountain Hunting Club), the members of which have been especially interested in assisting naturalists. Several kinds of mammals are known only from this "biological island" including the pocket gopher mentioned above and the shrew, _Sorex milleri_. The finding of a mole in the higher elevations of this range suggests that moles may occur in other mountainous areas of Mexico. Assistance with field work is acknowledged from the Kansas University Endowment Association. _Measurements._--The adult, male holotype measures as follows: Total length, 150; tail vertebrae, 27; hind foot, 20; greatest length (of skull), 32.2; palatilar length, 13.8; mastoidal breadth, 16.2; interorbital breadth, 7.0; maxillary tooth-row, 11.3; greatest depth of skull including auditory bullae, 9.4; weight, 38.6 grams. _Specimen examined._--One, from the type locality. In studying _Scalopus aquaticus texanus_, I noted that Allen (Bull. Amer. Mus. Nat. Hist., 3:221, April 29, 1891) based the original description on a single, unsexed specimen taken in Presidio County, Texas, by Wm. Lloyd in September, 1887. Later, Allen wrote (Bull. Amer. Mus. Nat. Hist., 5:200, August 18, 1893) that a series of moles from Rockport, Aransas County, Texas, agreed essentially with the type. True (Proc. U. S. Nat. Mus., 19:22, December 21, 1896) believed that the type was actually from Aransas County rather than Presidio County. This belief was shared by later workers. In checking the literature, I find that the collector of the type, Wm. Lloyd, who was obtaining specimens for George B. Sennett at the time, took other mammals in September as well as in October of 1887 in Presidio County (see Allen, Bull. Amer. Mus. Nat. Hist., 3:221, 223, 224, April 29, 1891) and birds there in June of 1887 (see Sennett, Auk, 5:43, January, 1888). I can find no evidence that Lloyd collected in or near Aransas County in 1887 and see no reason for doubting that the locality, Presidio County, as written on the original label of the type of _S. a. texanus_ is correct. Mr. M. J. Carroll of the Texas State Historical Association advises me that in 1887, Presidio County was reduced to its present size by the creation of Brewster and Jeff Davis counties. Lloyd might have taken the mole in any one of these three Trans-Pecos counties. Even so, these counties are widely separated geographically from the range of other moles designated as _S. a. texanus_ (see Davis, Amer. Midl. Nat., 27:386, March, 1942). The taking of _S. montanus_ in the Sierra del Carmen immediately south of Trans-Pecos Texas leads me to think that Lloyd's mole might have been taken in a mountainous region within one of the