WYOMING. _Albany County_: 27 mi. N, 8 mi. E Laramie, 6420 ft., 2. _Big Horn County_: 7-1/2 mi. E Graybull, 4050 ft., 1; 7 mi. S, 1/2 mi. E Basin, 3900 ft., 1. _Campbell County_: 4 mi. N, 3 mi. E Rockypoint, 3800 ft., 3; 1-3/5 mi. N, 3/4 mi. E Rockypoint, 2; Rockypoint, 5; 5 mi. S, 4 mi. W Rockypoint, 1; Ivy Creek, 5 mi. N, 8 mi. W Spotted Horse, 2. _Crook County_: 1-1/2 mi. NW Sundance, 5000 ft., 3. _Fremont County_: 2 mi. N, 3 mi. W Shoshoni, 4650 ft., 1; 3/10 mi. NW Milford, 5357 ft., 1; Milford, 5400 ft., 1. _Hot Springs County_: 3 mi. N, 10 mi. W Thermopolis, 4900-4950 ft., 7. _Johnson County_: 1 mi. W, 8/10 mi. S Buffalo, 4800 ft., 5; 6-1/2 mi. W, 2 mi. S Buffalo, 5620 ft., 4; 1 mi. WSW Kaycee, 4700 ft., 8. _Laramie County_: Horse Creek, 5000 ft., 3 mi. W Meriden, 1; 1 mi. N, 1/2 mi. W Pine Bluffs, 5040 ft., 4; 1 mi. S Pine Bluffs, 5100 ft., 1; 2 mi. S Pine Bluffs, 5200 ft., 2. _Natrona County_: 1 mi. NE Casper, 5150 ft., 1; 2-1/4 mi. W Casper, 5250 ft., 1; 7 mi. S, 2 mi. W Casper, 6370 ft., 1. _Niobrara County_: 2 mi. S, 1/2 mi. E Lusk, 5000 ft., 1. _Park County_: 4 mi. N Garland, 2; 13 mi. N, 1 mi. E Cody, 5200 ft., 2; 6/10 mi. S, 3-2/10 mi. E Cody, 5020 ft., 1. _Platte County_: 2-1/2 mi. S Chugwater, 5300 ft., 4. _Sheridan County_: 3 mi. WNW Monarch, 3800 ft., 4; 5 mi. NE Clearmont, 3900 ft., 6. _Washakie County_: 1 mi. N, 3 mi. E Tensleep, 4350 ft., 5. TABLE 2. CRANIAL MEASUREMENTS OF TWO SUBSPECIES OF REITHRODONTOMYS MEGALOTIS. Key to Table Headings: A =NUMBER AVERAGED AND SEX B = Greatest length of skull C = Zygomatic breadth D = Breadth of braincase E = Interorbital breadth F = Depth of cranium G = Length of rostrum H = Breadth of rostrum I = Length of incisive foramen J = Length of palate K = Alveolar length of maxillary tooth-row --------------------------+----+----+----+---+---+---+---+---+---+---- A | B | C | D | E | F | G | H | I | J | K --------------------------+----+----+----+---+---+---+---+---+---+---- _R. m. dychei_, Douglas County, Kansas Av. 17 (11 male, 6 female)|20.9|10.5|10.1|3.1|7.9|7.2|3.8|4.3|3.5|3.3 Minimum |20.4|10.0| 9.8|3.0|7.7|6.8|3.6|4.0|3.2|3.1 Maximum |21.9|10.9|10.3|3.3|8.2|7.9|4.0|4.5|3.9|3.4 --------------------------+----+----+----+---+---+---+---+---+---+---- Cherry County, Nebraska Av. 20 (14 male, 6 female)|21.0|10.9|10.3|3.1|7.9|7.3|3.8|4.4|3.6|3.5 Minimum |20.4|10.0| 9.8|2.9|7.5|6.8|3.5|4.3|3.4|3.2 Maximum |22.1|11.3|10.7|3.3|8.4|7.8|4.1|4.7|3.9|3.7 --------------------------+----+----+----+---+---+---+---+---+---+---- _R. m. aztecus_, San Juan County, New Mexico, and Montezuma County, Colorado