. Fig. 87. Distribution of two species of jumping mice in Colorado. 1. Zapus hudsonius preblei. 2. Zapus princeps princeps. For explanation of symbols, see p. 9. Comparison.—From Z. h. campestris, the subspecies of northeastern Wyoming and ad- jacent areas, Z. h. preblei differs in having a paler, duller dorsum that is less heavily washed with black, and a generally smaller skull with narrower incisive foramina. For more detailed comparisons, see Krutzsch (1954:452). Measurements.—External measurements of three males and the mean (and extremes) of nine females from Roulder are: 202, 212, 219,
. Fig. 87. Distribution of two species of jumping mice in Colorado. 1. Zapus hudsonius preblei. 2. Zapus princeps princeps. For explanation of symbols, see p. 9. Comparison.—From Z. h. campestris, the subspecies of northeastern Wyoming and ad- jacent areas, Z. h. preblei differs in having a paler, duller dorsum that is less heavily washed with black, and a generally smaller skull with narrower incisive foramina. For more detailed comparisons, see Krutzsch (1954:452). Measurements.—External measurements of three males and the mean (and extremes) of nine females from Roulder are: 202, 212, 219, (198-218); 123, 127, 127, (123- 133); 31, 29, 30, (29-31). Cranial meas- urements of the above sample include: con- dylobasal length, , , , ( ); zygomatic breadth, , , , () interorbital constriction, , , , (); length of maxillary toothrow, , , , (). Remarks.—Krutzsch (1954:453) considered Z. h. preblei to be a well-marked, isolated geographic race. Its range is separated from that of Z. h. campestris, the morphologically most similar named population, by the semi- arid area of eastern Wyoming between the North Platte River and the Black Hills. Zapus h. pallidus is known from eastern Kansas and westward to Cherry County, Nebraska. Mea- dow jumping mice are unreported from the South Platte Valley east of Greeley. Records of occurrence.—Specimens examined, 37, distributed as follows: LARIMER COUNTY: 2 1/2 mi. SE Fort Collins, 1 (CSU); Loveland, 2 (USNM). WELD COUNTY: Greeley, 1 (WC); 6 mi. E Hud- son, 5000 ft, 1 (CSU). BOULDER COUNTY: 3 mi. NW Niwot, 1 (DMNH); 8 1/2 mi. N, 3 1/4 mi. E Boulder, 1 (CU); Niwot, 1 (DMNH); Boulder, 24 (4 ANSP, 17 FMNH, 3 USNM); 3 mi. E Boulder, 1 (CU); 5 mi. E Boulder, 1 (CU); S of Boulder, 1 (CU). JEFFERSON COUNTY: Semper, 1 (KU). ADAMS COUNTY: Croak's [Croke] Lake, 1 (DMNH). Additional records: DENVER COUNTY: Den- ver (Cary, 1911:1
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