1. _D. o. richardsoni_ 2. _D. o. oklahomae_ 3. _D. o. compactus_ 4. _D. o. sennetti_ 5. _D. o. evexus_ 6. _D. o. medius_ 7. _D. o. obscurus_ 8. _D. o. terrosus_ 9. _D. o. panguitchensis_ 10. _D. o. uintensis_ 11. _D. o. sanrafaeli_ 12. _D. o. fremonti_ 13. _D. o. monoensis_ 14. _D. o. ordii_ 15. _D. o. luteolus_ 16. _D. o. extractus_ 17. _D. o. chapmani_ 18. _D. o. montanus_ 19. _D. o. cinderensis_ 20. _D. o. fetosus_ 21. _D. o. utahensis_ 22. _D. o. columbianus_ 23. _D. o. idoneus_ 24. _D. o. priscus_ 25. _D. o. celeripes_ 26. _D. o. cineraceus_ 27. _D. o. marshalli_ 28. _D. o. inaquosus_ 29. _D. o. attenuatus_ 30. _D. o. fuscus_ 31. _D. o. longipes_ 32. _D. o. pallidus_ 33. _D. o. nexilis_ 34. _D. o. cupidineus_ 35. _D. o. palmeri_ ] =Dipodomys ordii= Ord Kangaroo Rat _Dipodomys ordii_ is a medium sized, relatively short-tailed, five-toed species of a color about average for the genus. As in other members of the genus, the hind legs and feet are disproportionately long as an adaptation to the saltatorial mode of progression. The upperparts are buffy, reddish or blackish, depending on the subspecies, but the entire ventral surface, dorsal surfaces of the hind feet, supraorbital and postauricular spots, forelimbs, hip stripes, lateral stripes of the tail and the tail at the base are pure white. The skull has a relatively short rostrum, moderate to large auditory bullae, relatively wide interparietal, relatively wide maxillary arches and grooved upper incisors. The only other five-toed kangaroo rats with which _Dipodomys ordii_, at places, shares its geographic range, are _Dipodomys panamintinus_ and _Dipodomys microps_. _Dipodomys ordii_ can be distinguished from _Dipodomys panamintinus_ by smaller size (for instance the hind foot is shorter instead of longer than, 44 mm.) and narrower expanse of maxillary arches in relation to breadth across the auditory bullae, and from _Dipodomys microps_ by the awl-shaped, instead of chisel-shaped, lower incisors. The species _D. ordii_ is divisible into 35 subspecies, accounts of which follow: =Dipodomys ordii richardsoni= (Allen) _Dipodops richardsoni_ Allen, Bull. Amer. Mus. Nat. Hist., 3:277, June 30, 1891. _Dipodomys phillippi_, Knox, Trans. Kansas Acad. Sci., 4:22, 1875, (part--the part from Osborne, Kansas). _Dipodomys phillipsi ordi_, Coues and Allen, Monogr. North American Rodentia, p. 542, 1877 (part--the part from Ft. Cobb, Oklahoma). _Perodipus richardsoni_, Allen, Bull. Amer. Mus. Nat. Hist., 7:260, August 21, 1895 (part--the part from Pendennis, Kansas). _Cricetodipus richardsoni_, Trouessart, Catalogus Mammalium, 1:581, 1897. _Perodipus montanus richardsoni_, Bailey, N. Amer. Fauna, 25:144, October 1905 (part--the part from Canadian, Texas).