TRANSACTIONS OF THE SAN DIEGO SOCIETY OF NATURAL HISTORY Volume 12, No. 6, pp. 99-102 February 10, 195 5 A NEW RACE OF DIPODOMYS AND A NEW RACE OF THOMOMYS FROM ARIZONA BY Laurence M. Huey Curator of Birth ami Mammals, San Diego Society of Natural History Over a period of years there has been accumulated in the mammal collection of the San Diego Society of Natural History a series of specimens of Dipodomys deserti from southcentral Arizona and of Thomomys bottae from desert ranges in western Arizona bordering the Colorado River. The study of this material reveals sufficient characters in two geographic populations to indicate them as worthy of de-scriptions and new names. The Dipodomys may be known as Dipodomys deserti arizonae subsp. nov. Arizona Desert Kangaroo Rat Type. — From 3 miles southeast of Picacho, Pinal County, Arizona; No. 12 5 32 Collection of the San Diego Society of Natural History; adult male, collected by Laurence M. Huey, May 14, 1937. Characters. — Compared with Dipodomys deserti deserti, D. d. arizonae is grayish in color instead of buffy; it has a well marked undertail stripe in most specimens examined. The skull is smaller, with noticeably more rounded, inflated bullae and with a more slender rostrum. The maxillary arches of D. d. arizonae are more sharply angled with the axis of the skull than in either Dipodomys deserti sonoriensis or D. d deserti. Compared with D. d. sonoriensis, D. d. arizonae is lighter in color dorsally, with a tinge of buffy suffusion on the sides that is not present on the specimens of D. d. sonoriensis examined. The skull of D. d. arizonae differs from that of D. d. sonoriensis in having more rounded and massive bullae, heavier molar teeth, and wider maxillary arches. Measurements of type. — Total length, 345; tail, 193; hind foot, 52; ear, 14. Skull: Greatest length, 45.3; width across bullae, 30.8; spread PS. C^P. ZSOL uimm ft 9 * 3 1955 i-sri" i r^n
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