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color, smaller and less angular skull. From _Thomomys talpoides clusius_ (topotypes) to the northwestward, _T. t. attenuatus_ differs in shorter body, slightly grayer color, less width across mastoid region of skull, smaller tympanic bullae, and more obtuse anterolateral angle on zygoma. _Remarks._--This subspecies is of smaller size than any of the geographically adjoining subspecies. Intergradation with _T. t. cheyennensis_ is shown by specimens from two miles south and nine and one-half miles east of Cheyenne, Wyoming. Intergradation with _T. t. bullatus_ or _T. t. clusius_ or both is suggested by the larger size of the specimen from five miles southwest of Wheatland, Wyoming. Although large, this skull has the slender proportions of _attenuatus_ to which the specimen is tentatively referred. Although the specimens from Avalo, Colorado, are typical _attenuatus,_ the specimen from Pawnee Buttes, Colorado, is somewhat larger than typical _attenuatus_ and suggests intergradation with the subspecies to the southward, for example, at Flagler, Colorado. _Specimens examined._--Total number, 44, and unless otherwise indicated in the Museum of Natural History of the University of Kansas. =Wyoming.= _Niobrara County_: 10 mi. N Hatcreek Post Office, 5300 ft., 1. _Platte Co._: 5 mi. SW Wheatland, 1 (U. S. B. S.). _Goshen Co._: Little Bear Creek, 20 mi. SE Chugwater, 1 (U. S. B. S.). _Laramie Co._: 5 mi. W and 1 mi. N Horse Creek P. O., 7200 ft., 1; 3-1/2 mi. W Horse Creek P. O., 7000 ft., 6; 2-1/5 mi. W Horse Creek P. O., 6600 ft., 1; 2 mi. W Horse Creek P. O., 6600 ft., 2; Horse Creek 6500 ft., 1; 3 mi. E Horse Creek P. O., 6400 ft., 5; 6 mi. W Islay, 2 (U. S. B. S.); 2 mi. S and 1/2 mi. E Pine Bluffs, 5200 ft., 1; 7 mi. W Cheyenne, 6500 ft., 1; Cheyenne, 7 (U. S. N. M.); 1 mi. S and 4-1/2 mi. E Cheyenne, 5200 ft., 1; 2 mi. S and 9-1/2 mi. E Cheyenne, 5200 ft., 3; Arcola, 5200 ft., 4. =Colorado.= _Weld Co._: Pawnee Buttes, 5300 ft., 1 (U. S. B. S.). _Logan Co._: Chimney Canyon, 10 mi. NE Avalo, 5100 ft., 5 (U. S. B. S.). _Museum of Natural History, University of Kansas, Lawrence. Transmitted January 15, 1951._ TABLE 1. MEASUREMENTS, IN MILLIMETERS, OF TWO SUBSPECIES OF THOMOMYS TALPOIDES. ______________________________________________________________________ Column A Catalogue number or number of averaged individuals Column B Sex Column C Total length Column D Length of tail Column E
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