. Fig. 62. Distribution of Dipodomys ordii in Colo- rado. 1. D. o. evexus. 2. D. o. longipes. 3. D. o. luteolus. 4. D. o. montanus. 5. D. o. nexilis 6. D. o. priscus. 7. D. o. richardsoni. 8. D. o. sanrafaeli. For explanation of symbols, see p. 9. (241-274); (133-163), (138-159); (37-43), (39-43). For representa- tive cranial measurements, see table 17. Remarks.—Simply on geographic consid- erations, one would expect kangaroo rats from the Arkansas Valley below Royal Gorge to agree with the population of the plains to the east and not with the subspecies of the Upper Arka
. Fig. 62. Distribution of Dipodomys ordii in Colo- rado. 1. D. o. evexus. 2. D. o. longipes. 3. D. o. luteolus. 4. D. o. montanus. 5. D. o. nexilis 6. D. o. priscus. 7. D. o. richardsoni. 8. D. o. sanrafaeli. For explanation of symbols, see p. 9. (241-274); (133-163), (138-159); (37-43), (39-43). For representa- tive cranial measurements, see table 17. Remarks.—Simply on geographic consid- erations, one would expect kangaroo rats from the Arkansas Valley below Royal Gorge to agree with the population of the plains to the east and not with the subspecies of the Upper Arkansas Valley. On morphologic grounds, however, that is not the case. Certainly gene flow must be severely restricted by the Royal Gorge and other sections of the middle Arkan- sas Valley. Probably local populations at Salida and Canon City are essentially isolated from each other. The ranges of D. o. evexus and D. o. mon- tanus are separated by the Sangre de Cristo Range, presently a barrier between the two populations even at Poncha Pass, the low northern terminus of the range. Setzer (1949:519) referred a specimen from Pueblo to D. o. evexus. Additional speci- mens now are available from that area and they appear to me to be referable to D. o. richardsoni. Coues and Yarrow (1875:109) listed a specimen from Twin Lakes, but I doubt that D. ordii has occurred at that ele- vation (about 9200 feet) in the Arkansas Valley within historic time. Records of occurrence.—Specimens examined, 71, distributed as follows: CHAFFEE COUNTY: 3 mi.
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