Of a pair of adults from eight miles west of Rosalia, Butler County, the female is indistinguishable in color from adults of _G. b. industrius_ from northern Meade County and from two specimens from eleven miles west of Clarendon, Donley County, Texas, near the type locality of _G. b. major_. The male from eight miles west of Rosalia is darker as compared either with _G. b. industrius_ or _G. b. major_ and the coloration of the upper parts resembles those in _G. b._ _majusculus_; the underparts are only slightly paler than the upper parts as in _majusculus_. Measurements of the skulls are intermediate between the averages for _G. b. majusculus_ and those for _G. b. major_. These specimens from eight miles west of Rosalia are intermediate structurally, and since they are intermediate geographically between _G. b. majusculus_ and _G. b. major_, they suggest intergradation of the two subspecies. The specimens in question are referred to _major_ because the size is nearer that of _major_. It is mainly the intermediate nature of these two specimens from Butler County, and the intermediate nature of the specimens from McPherson County, Kansas, that have caused us to treat _G. b. majusculus_ as only subspecifically distinct from the more western subspecies, _major_. _Specimens examined._--Total number, 77, as follows: _Ellsworth County_: 2 mi. S Ellsworth, 1. _McPherson County_: Smoky Hill River, 1 mi. S and 1/2 mi. W Lindsborg, 5; 1/2 mi. E McPherson, 1. _Stafford County_: Little Salt Marsh, 12; no locality more precise than county, 3. _Reno County_: 8 mi. N and 1 mi. E Haven, 2. _Harvey County_: 1 mi. E and 1/2 mi. N Halstead, 1; Halstead, 3. _Butler County_: 8 mi. W Rosalia, 2. _Barber County_: near South Bridge, Sun City, 1; 2 mi. S Sun City, 1; Wells Ranch, Aetna, 5; "1 mi. W Aetna," 3; near South Bridge, Aetna, 1; near Bridge, 1 mi. S Aetna, 2. _Harper County_: 4-1/2 mi. NE Danville, 8; 1 mi. N Harper, 11; 3 mi. S Harper, 1. _Cowley County_: 3 mi. SW Arkansas City, 4; 3 mi. SE Arkansas City, 9; 3 mi. S Arkansas City, 1. MEASUREMENTS OF ADULT MALES OF GEOMYS (In millimeters) Key for table headings in table on this page. N: Number of individuals averaged or catalogue number L: Total length T: Length of tail H: Length of hind foot B: Basilar length Na: Length of nasals Z: Zygomatic breadth M: Mastoid breadth Rb: Breadth of rostrum I: Interorbital constriction A: Alveolar length of maxillary tooth row E: Extension of premaxilla posterior to nasals S: Depth of skull Rl: Length of rostrum