. Fig. 54. Distribution of Thomomys bottae in Colorado. aureus. 2. T. b. cultellus. 3. T. b. howelli. 4. T. b. internatus. 5. T. b. pervagus. 6. T. b. rubidus. For explanation of symbols, see p. 9. not forming a V-shaped notch; basioccipital narrower. For comparison with T. b. Iwwelli, the subspecies of the Grand Valley, see account of that subspecies. Measurements.—Mean (and extreme) ex- ternal measurements of nine males, followed by those of nine females, all from Montezuma County, are: (215-257), (217-232); (62-81), (61-73); (28-33), (26-32); —, (5
. Fig. 54. Distribution of Thomomys bottae in Colorado. aureus. 2. T. b. cultellus. 3. T. b. howelli. 4. T. b. internatus. 5. T. b. pervagus. 6. T. b. rubidus. For explanation of symbols, see p. 9. not forming a V-shaped notch; basioccipital narrower. For comparison with T. b. Iwwelli, the subspecies of the Grand Valley, see account of that subspecies. Measurements.—Mean (and extreme) ex- ternal measurements of nine males, followed by those of nine females, all from Montezuma County, are: (215-257), (217-232); (62-81), (61-73); (28-33), (26-32); —, (5-7); mean and extreme weights of five males, (167-221), of eight females, (134-175). Average (and extreme) external measure- ments of four males, followed by those of four females, all from La Plata and Archuleta coun- ties, are: (236-262), (208-230); (70-87), (63-66); (29-35), (27-32); (6-6), (6-6); mean weight of four males, (173-215), weights of two females, 142, 132. Selected cranial measure- ments are presented in table 13. Remarks.—Coloradan pocket gophers from La Plata County had been considered to rep- resent a subspecies (apache) distinct from aureus. Youngman (1958:371) considered apache to be a synonym of aureus, and de- scribed clinal variation in color in valley pocket gophers of the San Juan drainage. Youngman (loc. cit.) is followed herein, al- though Durrant and Dean (1961:168) main- tained a distinction between apache and
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