subspecies of S. aquaticus were available for examination and descriptions of others were studied. It was found that the number and magnitude of the differences separating any one of these subspecies from an adjoining one was less than those separating S. montanus from S. a. texanus and S. a. intermedius, which are, geographically, closest to S. montanus. S. montanus seems not to be closely related to S. inflatus of Tamaulipas. S. montanus is given specific rank because of the great degree of difference between it and its nearest relatives, and because of its geographically isolated position.

The specimen of S. montanus was taken in a tunnel found by digging away a mound thought to be that of the pocket gopher, Thomomys sturgisi. A trap set in one direction in the tunnel caught the mole; a trap set in the other direction in the tunnel was later covered with soil, evidently by a gopher. After the capture a thorough inspection of the area revealed no "raised" tunnels, typical of Scalopus. A series of Thomomys was taken in this area in sets placed in tunnels found under similar mounds. This locality was near the headquarters of the Club Sierra del Carmen in a parklike stand of oak timber in a cañon, at an elevation of 4950 ft. as recorded by our altimeter. The plant association was judged to be characteristic of the Upper Sonoran Life-zone, not far below the beginning of the Transition Life-zone. The area was heavily grazed by goats, hogs and horses and had little grass or other ground cover under the trees. The soil in this cañon was not deep and consisted of a rocky, marly mixture, pale red in color, evidently produced by weathering of the reddish volcanic rocks bordering the cañon.

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.

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