. Fig. 56. Distribution of Geomys bursarius in Colorado. 1. G. b. jugossicularis. 2. G. b. lutescens. For explanation of symbols, see p. 9. Raca County are: 255, 243, 255; 87, 82, 83; 31, 32, 32; weights, 215, 178, 175. External meas- urements of two males, and mean (and ex- tremes) of five females, all from east-central Fremont County, are: 269, 303, (249- 267); 80, 93, (75-90); 32, 36, (31- 35). Selected cranial measurements are pre- sented in table 15. Remarks.—Externally, Coloradan speci- mens of G. b. lutescens and G. b. jugossicularis are practically indistinguishable, al
. Fig. 56. Distribution of Geomys bursarius in Colorado. 1. G. b. jugossicularis. 2. G. b. lutescens. For explanation of symbols, see p. 9. Raca County are: 255, 243, 255; 87, 82, 83; 31, 32, 32; weights, 215, 178, 175. External meas- urements of two males, and mean (and ex- tremes) of five females, all from east-central Fremont County, are: 269, 303, (249- 267); 80, 93, (75-90); 32, 36, (31- 35). Selected cranial measurements are pre- sented in table 15. Remarks.—Externally, Coloradan speci- mens of G. b. lutescens and G. b. jugossicularis are practically indistinguishable, although topotypes of the two races differ consistently, if slightly, in color. The subspecies are re- markably distinct in cranial detail, however. The best criterion by which to distinguish jugossicularis is the relatively short jugal bone. The length of the jugal and the length of the zygomatic arch anterior to the jugal (meas- ured from the anteromost point on the jugal to the junction of frontal, maxillary, and pre- maxillary) were considered. The mean ratio of these two measurements in a sample of G. bursarius from south of the Arkansas River was (range, ) for five males, and (range, ) for five fe- males. In a sample of individuals from north- eastern Colorado (along and north of a line from Denver to Cope), the mean ratio was (range, ) for nine males, and (range, ) for 16 females. Specimens from east-central Fremont County (south-southeast of Canon City and west of Florence) are the largest individuals
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