. Fig. 67. Distribution of Peromyscus maniculatus in Colorado. 1. P. m. luteus. 2. P. m. nebrascensis. 3. P. m. rufinus. For explanation of symbols, see p. 9. luteus differs in smaller size, both externally and cranially, and in paler color (more yellow- ish buff, less grayish brown). Measurements.—Mean (and extreme) ex- ternal measurements of six males, followed by those of 10 females, all from eastern Yuma County, are: (145-159), (138- 167); (59-67), (57-66); (17- 20), (18-20); (14-16), (14-17); weight, (), (). For selec
. Fig. 67. Distribution of Peromyscus maniculatus in Colorado. 1. P. m. luteus. 2. P. m. nebrascensis. 3. P. m. rufinus. For explanation of symbols, see p. 9. luteus differs in smaller size, both externally and cranially, and in paler color (more yellow- ish buff, less grayish brown). Measurements.—Mean (and extreme) ex- ternal measurements of six males, followed by those of 10 females, all from eastern Yuma County, are: (145-159), (138- 167); (59-67), (57-66); (17- 20), (18-20); (14-16), (14-17); weight, (), (). For selected cranial measurements, see table 19. Remarks.—Osgood (1909:79) referred specimens from Spring Canyon, southwest of Fort Collins, to this subspecies. Those speci- mens and others from the immediate vicinity of Fort Collins are herein referred to P. m. nebrascensis. Deer mice from eastern Colo- rado first were referred to the race now known as P. m. luteus by Jones and Loomis (1954). In general, individuals from the upper reaches of the Arikaree and Republican rivers closely resemble topotypes of luteus in color and also approach the small size of that race. Colorad- an specimens average larger than topotypical luteus and represent intergrades between that race and P. m. nebrascensis. Jones (1964:205) observed a comparable pattern of intergrada- tion in mice from adjacent Dundy County, Nebraska. To the north, in the South Platte drainage, and to the south, in the Arkansas watershed,
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