Chapter 3

mi. SE Mason City, 1 (UMMZ). _Dawes County_: Wayside, 1; 3 mi. E Chadron, 2; 6 mi. S Chadron, 1 (NSM); 8 mi. S Chadron, 1 (NSM); 10 mi. S Chadron, 1 (UMMZ); 1 mi. W Crawford, 2 (NSM); Crawford, 2 (UMMZ). _Dawson County_: 1/2 mi. S Gothenburg, 5; 3 mi. SSE Gothenburg, 4. _Deuel County_: 1 mi. N, 2 mi. W Chappell, 3. _Dixon County_: 3 mi. NE Ponca, 4. _Dundy County_: Rock Creek Fish Hatchery, 5 mi. N, 2 mi. W Parks, 42; 2 mi. N, 2 mi. W Haigler, 1; Arikaree River, Parks, 2; 2 mi. SW Benkleman, 7; Haigler, 3 (1 NSM, 2 USNM). _Franklin County_: 1-1/2-2 mi. S Franklin, 10. _Gage County_: 1 mi. SE DeWitt, 3; 1/4 mi. W Homestead Nat'l Mon., 1; 1 mi. S, 1 mi. W Barnston, 1; 1-1/2 mi. S, 2 mi. E Barnston, 18. _Garden County_: Crescent Lake Nat'l Wildlife Refuge, 1; 1/2 mi. S Oshkosh, 1. _Hall County_: 6 mi. S Grand Island, 5. _Harlan County_: 1 mi. W Alma, 17. _Hitchcock County_: Republican River, Trenton, 3. _Hooker County_: Kelso, 3 (UMMZ). _Holt County_: 6 mi. N Midway, 4; 1 mi. S Atkinson, 4 (2 NSM); Ewing, 1 (USNM). _Jefferson County_: 7 mi. S, 2 mi. W Fairbury, 6; 3 mi. S, 1 mi. W Endicott, 1. _Johnson County_: 1 mi. S, 1-1/2 mi. E Burr, 1. _Kearney County_: 1-3/4-3-3/4 mi. S Kearney, 6. _Keith County_: 4 mi. WNW Keystone, 69. _Keya Paha County_: 12 mi. N Springview, 8; 12 mi. NNW Springview, 5. _Kimball County_: 3 mi. E Kimball, 1; Smeed, 40. _Knox County_: 3 mi. W Niobrara, 2; 1 mi. SE Niobrara, 5; 2 mi. S Niobrara, 2; Verdigre, 2 (USNM). _Lancaster County_: within 5 mi. Lincoln, 21 (8 NSM). _Lincoln County_: 2 mi. N North Platte, 1; Conroy Canyon, SW corner sec. 4, T. 11 N, R. 27 W (5 mi. S, 2-1/2 mi. W Brady), 2 (NSM). _Logan County_: 1-2 mi. NE Stapleton, 11. _Madison County_: Norfolk, 1 (USNM). _Morrill County_: 1 mi. N Bridgeport, 4. _Nemaha County_: 2 mi. SW Peru, 6; 3 mi. S, 1-1/2 mi. E Peru, 2. _Nuckolls County_: 2 mi. WSW Superior, 5; 1 mi. SSW Hardy, 9. _Otoe County_: 1 mi. SE Nebraska City, 3; 3 mi. S, 2 mi. E Nebraska City, 3. _Pawnee County_: Turkey Creek, 4 mi. NW Pawnee City, 2 (NSM); 4 mi. S, 8 mi. W Pawnee City, 7; 1 mi. S Du Bois, 4. _Platte County_: Columbus, 3 (USNM). _Polk County_: 15 mi. W Osceola, 2. _Red Willow County_: 5 mi. S, 2-1/2 mi. E McCook, 2; 8 mi. S, 3 mi. E McCook, 2. _Richardson County_: 5 mi. N, 2 mi. W Humboldt, 2 (1 NSM); 4 mi. E Barada, 16; 3-1/2 mi. S, 1 mi. W Dawson, 6; 2 mi. N Falls City, 2; 4-6 mi. W Falls City, 4; 1/2 mi. S, 1-1/2 mi. W Rulo, 1. _Saline County_: 2 mi. NE Crete, 1; 1/2 mi. W DeWitt, 1. _Sarpy County_: 1 mi. W Meadow, 1. _Saunders County_: 2 mi. NW Ashland, 3. _Scotts Bluff County_: 8 mi. NNW Scottsbluff, 1; Mitchell, 1 (NSM); 1/2-1 mi. S Mitchell, 13; 5 mi. S Gering, 10; 7 mi. S Gering, 1; 11-12 mi. S Scottsbluff, 4600-4800 ft., 8; 12 mi. SSW Scottsbluff, 4700 ft., 5. _Sioux County_: 1 mi. S, 4 mi. W Orella, 1 (NSM); 8 mi. N Harrison, 2 (UMMZ); 6-1/2-7 mi. W Crawford, 3 (1 NSM); 8 mi. N, 1 mi. E Glen, 1 (NSM); 3 mi. NE Glen, 1 (NSM); Glen, 3 (NSM); Agate, 4600 ft., 1. _Stanton County_: 1-1/2 mi. S Pilger, 3; 6 mi. SE Norfolk, 1. _Thomas County_: 1 mi. W Halsey, 2; Halsey, 1 (NSM). _Thurston County_: 1 mi. S Winnebago, 8. _Valley County_: 2 mi. W Ord, 1; 2 mi. S, 4 mi. E Ord, 6. _Washington County_: 1 mi. E Blair, 6; 3 mi. SE Blair, 2; 6 mi. SE Blair, 7; 3 mi. S, 2 mi. E Ft. Calhoun, 1 (NSM). _Wayne County_: 1/2 mi. W-2-1/2 mi. E Wayne, 3. _Webster County_: 3 mi. S Red Cloud, 2.

SOUTH DAKOTA. _Buffalo County_: 2 mi. S, 3 mi. E Ft. Thompson, 1370 ft., 4. _Clay County_: 2-1/2 mi. N, 1/2 mi. W Vermillion, 1. _Pennington County_: 2 mi. S, 3 mi. W Scenic, 1. _Stanley County_: 1.2 mi. S, 4 mi. W Ft. Pierre, 1484 ft., 1.

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

Av. 10 (6 male, 4 female) |21.5|10.8|10.2|3.1|8.1|7.7|3.7|4.5|3.4|3.5 Minimum |20.5|10.4| 9.9|2.9|7.9|7.2|3.5|3.9|3.1|3.2 Maximum |22.7|11.1|10.6|3.3|8.4|8.2|3.9|4.8|3.7|3.7 --------------------------+----+----+----+---+---+---+---+---+---+----

LITERATURE CITED

ALLEN, J. A.

1893. List of mammals collected by Mr. Charles P. Rowley in the San Juan region of Colorado, New Mexico and Utah, with descriptions of new species. Bull. Amer. Mus. Nat. Hist, 5:69-84, April 28.

1895. On the species of the genus Reithrodontomys. Bull. Amer. Mus. Nat. Hist, 7:107-143, May 21.

BENSON, S. B.

1935. The status of Reithrodontomys montanus (Baird). Jour. Mamm., 16:139-142, 1 fig., May 15.

BLAIR, W. F.

1954. Mammals of the Mesquite Plains Biotic District in Texas and Oklahoma, and speciation in the central grasslands. Texas Jour. Sci., 6:235-264, 1 fig., September.

DALQUEST, W. W.

1948. Mammals of Washington. Univ. Kansas Publ., Mus. Nat. Hist., 2:1-444, 140 figs., April 9.

HALL, E. R., and K. R. KELSON

1959. The mammals of North America. Ronald Press, New York, vols. 1:xxx + 1-546 + 79 and 2:viii + 547-1083 + 79, 553 figs., 500 maps, 178 unnumbered text figs., March 31.

HILL, J. E., and C. W. HIBBARD

1943. Ecological differences between two harvest mice (_Reithrodontomys_) in western Kansas. Jour. Mamm., 24:22-25, February 20.

HOFFMEISTER, D. F., and J. E. WARNOCK

1955. The harvest mouse (Reithrodontomys megalotis) in Illinois and its taxonomic status. Trans. Illinois Acad. Sci., 47:161-164, 1 fig.

HOOPER, E. T.

1952. A systematic review of the harvest mice (genus Reithrodontomys) of Latin America. Misc. Publ. Mus. Zool., Univ. Michigan, 77: 1-255, 9 pls., 24 figs., 12 maps, January 16.

HOWELL, A. H.

1914. Revision of the American harvest mice (genus Reithrodontomys). N. Amer. Fauna, 36:1-97, 7 pls., 6 figs., June 5.

1935. The harvest mice of the San Luis Valley, Colorado. Jour. Mamm., 16:143-144, May 15.

LAYNE, J. N.

1959. Growth and development of the eastern harvest mouse, Reithrodontomys humulis. Bull. Florida State Mus., 4:61-82, 5 figs., April 27.

VERTS, B. J.

1960. Ecological notes on _Reithrodontomys megalotis_ in Illinois. Nat. Hist. Misc., Chicago Acad. Sci., 174:1-7, 1 fig., July 25.

_Transmitted March 30, 1961._