. Distribution of mammals in Colorado. Mammals. 236 MONOGRAPH MUSEUM OF NATURAL HISTORY NO. 3 1858; type locality, Sawatch [Cochetopa] Pass, Sa- guache Co., Colorado. Microtus pennsylvanicus modestus, V. Bailey, N. Amer. Fauna, 17:20, 6 June 1900. Distribution in Colorado.—South-central part of state, south of Arkansas River (Fig. 81). Comparison.—From M. p. uligocola, the subspecies of north-central Colorado, M. p. modestus differs in having darker dorsal color, a narrower skull, and a shorter average maxil- lary toothrow. For detailed comparisons, see Anderson (1956:93). Measurements.—Mean (
. Distribution of mammals in Colorado. Mammals. 236 MONOGRAPH MUSEUM OF NATURAL HISTORY NO. 3 1858; type locality, Sawatch [Cochetopa] Pass, Sa- guache Co., Colorado. Microtus pennsylvanicus modestus, V. Bailey, N. Amer. Fauna, 17:20, 6 June 1900. Distribution in Colorado.—South-central part of state, south of Arkansas River (Fig. 81). Comparison.—From M. p. uligocola, the subspecies of north-central Colorado, M. p. modestus differs in having darker dorsal color, a narrower skull, and a shorter average maxil- lary toothrow. For detailed comparisons, see Anderson (1956:93). Measurements.—Mean (and extreme) ex- ternal measurements of four males from the vicinity of Cochetopa Pass, four males from eastern Costilla County, and eight females from near Monument Lake, Las Animas County, are, respectively: (160-175), (168-179), (158-184); (38- 47), (40-45), (42-49); (20-22), (20-21); (20-22); (14-17), (11-14), (15-18); weight, ( ), (), —. For cranial meas- urements, see table 22. Remarks.—Anderson (1956:94) noted a questionable record of M. pennsylvanicus from Trinchera, Las Animas County, based on a skin witiiout skull in the Denver Museum. The specimen in question was not seen by me. The possibility exists that the specimen was from Trinchera Peak, in the Culebra Range, and not from Trinchera, the town. On the other hand, specimens are now available from near Monument Lake on the Park Plateau, bridging a considerable gap in the range, so that a record from near the end of Raton Mesa no longer seems so aberrant. Nonetheless, fol- lowing Anderson (loc. cit.), the record is con- sidered questionable on ecological grounds and the locality in question is not mapped on figure 81. Records of occurrence.—Specimens examined, 222, distributed as follows: GUNNISON COUNTY: Ohio Creek, 6 mi. N Gunnison, 1 (WSC); Ohio Creek, 1 (WSC); near Ohio Creek, Gunnison, 1 (WSC). CHAFFEE COUNT
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