Fig. 26. Known occurrences and probable geographic range of the subspecies of Dipodomys ordii in the southwestern fourth of the range of the species. 14. D. o. ordii 17. D. o. chapmani 31. D. o. longipes
| Fig. 26. Known occurrences and probable geographic range of the subspecies of Dipodomys ordii in the southwestern fourth of the range of the species. | |||||
| 14. | D. o. ordii | 17. | D. o. chapmani | 31. | D. o. longipes |
Remarks.—This subspecies of Dipodomys ordii appears to be restricted to the San Luis Valley of Colorado and New Mexico. Intergradation, between Dipodomys ordii ordii and D. o. montanus, is noted in animals from Gran Quivira, Mesa Jumanes, New Mexico. These animals have the frontomaxillary suture and extension of the premaxilla as in D. o. ordii and the nasals and inflation of the auditory bullae as in D. o. montanus. In the majority of characters they are, however, referable to the latter. Intergradation is noted also in animals from 4 miles southwest of Cimmaron, New Mexico, in that they resemble D. o. richardsoni in the shape of the nasals and the width and length of the rostrum but in the remainder of the characters studied resemble D. o. montanus to which they are referred.
Baird, in the original description, gives "near Fort Massachusetts" as the type locality for this subspecies. [Miller] (1923) lists the type locality as "Fort Massachusetts (now Fort Garland)." Fort Massachusetts and Fort Garland are two different ex-army posts. Old Fort Massachusetts was situated on what is now the Trinchera Ranch which is north of the town of Fort Garland. Old Fort Garland is approximately one-half mile south of the town of Fort Garland. The two abandoned army posts were no more than twelve miles apart. In 1946, at neither abandoned post could I find any habitat suitable for kangaroo rats.
Specimens examined.—Total, 148, distributed as follows:
Colorado: Saguache County: Saguache, 1 (USBS). Alamosa County: 1.6 mi. NE Medano Springs Ranch Headquarters, 8 (MVZ); Great Sand Dunes National Monument, 10 (MVZ); 8 mi. S Great Sand Dunes National Monument, 4 (MVZ); Medano Ranch, 15 mi. NE Mosca, 11 (2 USBS; 9 MVZ); 22 mi. E Mosca, 5 (AMNH); Alamosa, 1 (UM). Conejos County: Antonito, 1 (USBS); 7 mi. E Antonito, 3 (USBS); 12 mi. E Antonito, 2 (USBS). Costilla County: 4-1/2 mi. N Blanca, 8100 ft., 3 (MVZ); 1 mi. NE Blanca, 7950 ft., 1 (MVZ); 3 mi. NW Fort Garland, 6 (CMNH); 1 mi. NW Fort Garland, 3 (MVZ); 15 mi. W Fort Garland, 7800 ft., 4 (KU); Fort Garland, 64 (31 USBS; 28 LACM; 5 MVZ); 5 mi. SSE Fort Garland, 4 (AMNH); 5 mi. S Fort Garland, 2 (AMNH).
New Mexico: Colfax County: 4 mi. SW Cimmaron, 5 (AMNH); 3 mi. SE Cimmaron, 8 (AMNH); 1-1/2 mi. W Philmont Ranch Headquarters, 2 (AMNH).
Dipodomys ordii cinderensis Hardy
Dipodomys ordii cinderensis Hardy, Proc. Biol. Soc. Washington, 57:53, October 31, 1944.