. Fig. 55. Distribution of Thomomys talpoides in Colorado. 1. T. t. agrestis. 2. T. t. attenuatus. 3. T. t. durranti. 4. T. t. fossor. 5. T. t. macrotis. 6. T. t. meritus. 7. T. t. ocius; 8. T. t. retrorsus. 9. T. t. rostralis. For explanation of symbols, see p. 9. under the specific name talpoides are, in fact, distinct biological species. Until evolutionary relationships of the several populations have been worked out in detail, however, to con- tinue to treat members of the "Thomomys talpoides complex" as subspecies seems to me to be the conservative course. Thomomys talpoides agr
. Fig. 55. Distribution of Thomomys talpoides in Colorado. 1. T. t. agrestis. 2. T. t. attenuatus. 3. T. t. durranti. 4. T. t. fossor. 5. T. t. macrotis. 6. T. t. meritus. 7. T. t. ocius; 8. T. t. retrorsus. 9. T. t. rostralis. For explanation of symbols, see p. 9. under the specific name talpoides are, in fact, distinct biological species. Until evolutionary relationships of the several populations have been worked out in detail, however, to con- tinue to treat members of the "Thomomys talpoides complex" as subspecies seems to me to be the conservative course. Thomomys talpoides agrestis Merriam Thomomys talpoides agrestis Merriam, Proc. Biol. Soc. Washington, 21:144, 9 June 1908; type locality, Medano Ranch, 15 mi. NE Mosca, Alamosa Co., Colorado. Distribution in Colorado.—San Luis Val- ley, north and east of the Rio Grande (Fig. 55). Comparisons.—From both T. t. fossor and T. t. rostralis, subspecies of the mountains to the west and east, respectively, T. t. agrestis differs in generally smaller size (both exter- nally and cranially) and markedly paler (gray- ish to yellowish buff) color. Measurements.—Mean (and extreme) ex- ternal measurements of four males, followed by those of five females, all from the type locality, are: (224-240), (203-226); (58-72), (52-72); (30-31), (29-31). For cranial measurements, see table 14. Remarks.—Specimens from Medano Canon are darker in color than topotypes, perhaps indicating intergradation with T. t. rostralis.
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