. Fig. 48. Distribution of Spermophilus lateralis in Colorado. 1. S. 1. lateralis. 2. S. /. wortmani. For explanation of symbols, see p. 9. the Museum of Natural History, University of Illinois. Spermophilus lateralis lateralis (Say) S[ciurus]. lateralis Say, in James, Account of an expedition from Pittsburgh to the Rocky Moun- tains . . , 2:46, 1823; type locality, vicinity of Canon City, Fremont Co., Colorado. Spermophilus lateralis, Cuvier, Supplement a l'histoire naturelle generale et particuliere de Buffon, 1:335, 1831. Distribution in Colorado.—Western three- fifths of state (Fig. 48). C
. Fig. 48. Distribution of Spermophilus lateralis in Colorado. 1. S. 1. lateralis. 2. S. /. wortmani. For explanation of symbols, see p. 9. the Museum of Natural History, University of Illinois. Spermophilus lateralis lateralis (Say) S[ciurus]. lateralis Say, in James, Account of an expedition from Pittsburgh to the Rocky Moun- tains . . , 2:46, 1823; type locality, vicinity of Canon City, Fremont Co., Colorado. Spermophilus lateralis, Cuvier, Supplement a l'histoire naturelle generale et particuliere de Buffon, 1:335, 1831. Distribution in Colorado.—Western three- fifths of state (Fig. 48). Comparison.—From S. I. wortmani, the subspecies of central Sweetwater County, Wy- oming, and immediately adjacent Colorado, S. I. lateralis differs in generally brighter color, better-defined lateral stripes that are predomi- nantly black rather than brown, slightly small- er skull, and slightly longer nasal bones. Measurements.—Mean (and extreme) ex- ternal measurements of five males, followed by those of eight females, all from Larimer and Boulder counties, are: (269-294), (246-285); (88-116), (74-97); (40-43), (38-44); (16-22), (18-23); mean weight of three males, (), of six females, (). External measurements of two males and two females from Two Bar Spring, Moffat County, are, respectively: 275, 271, 275, 285; 91, 84, 92, 91; 40, 44, 44, 45. Cranial measurements are presented in table 11.
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