The specimen examined from four miles north of Jaumave was trapped in a xeric area in which the vegetation consisted of mesquite, high palmlike yuccas, and "lechugilla." Specimens from the vicinity of Tula were trapped along bushy fence rows and adjacent to clumps of bushes and cactus, or shot at night in an area in which the soil was a sandy loam having relatively large amounts of gravel. The average weight of seven specimens from Nicolás was 50.3 (42-60) grams. According to Lidicker (1960:178 and in _litt._), the place called Lulú that was ascribed to Tamaulipas by Setzer (1949:550), and from which _D. o. durranti_ was reported, actually is in Zacatecas. _Records of occurrence._--Specimens examined, 19: Miquihuana, 6200 ft., 2; 4 mi. N Jaumave, 2500 ft., 3; Nicolás, 56 km. NW Tula, 12; 8 km. N Tula, 4500 ft., 2. Additional records (Setzer, 1949:556): Nuevo Laredo; Jaumave. =Dipodomys ordii parvabullatus= Hall 1951. _Dipodomys ordii parvabullatus_ Hall, Univ. Kansas Publ., Mus. Nat. Hist., 5:38, October 1, type from 88 mi. S and 10 mi. W Matamoros, Tamaulipas. _Distribution in Tamaulipas._--Known only from two islands off the barrier beach. Weight of four adults averaged 49.2 (44-60) grams. _Records of occurrence._--Specimens examined, 17: 33 mi. S Washington Beach, 4; 88 mi. S, 10 mi. W Matamoros, 7; 90 mi. S, 10 mi. W Matamoros, 6. =Dipodomys ordii compactus= True 1889. _Dipodomys compactus_ True, Proc. U. S. Nat. Mus., 11:160, January 5, type from Padre Island, Cameron Co., Texas. 1942. _Dipodomys ordii compactus_, Davis, Jour. Mamm., 23:332, August 13. _Distribution in Tamaulipas._--Reported only from Bagdad (Hall, 1951:41). =Dipodomys merriami atronasus= Merriam Merriam's Kangaroo Rat 1894. _Dipodomys merriami atronasus_ Merriam, Proc. Biol. Soc. Washington, 9:113, June 21, type from Hacienda La Parada, about 25 mi. NW San Luis Potosí, San Luis Potosí. _Distribution in Tamaulipas._--Mexican Plateau in western part of state. Specimens examined are tentatively assigned to _Dipodomys merriami atronasus_. They differ from typical _atronasus_ as pointed out by Lidicker (1960:177). He noted that individuals from the eastern edge of the range of _D. m. atronasus_ were slightly paler than typical specimens, but I found Tamaulipan material to be much darker, especially behind the nose and ears (blackish instead of brownish), than specimens from Aguascalientes, San Luis Potosí and Zacatecas. Specimens examined were collected under the same conditions and in the same areas as _D. ordii durranti_. The average weight of 20 adults (11 females and nine males) was 46.6 (38-50) grams. _Records of occurrences._--Specimens examined, 27: Nicolás, 56 km. NW Tula, 5500 ft., 16; Tajada, 23 mi. NW Tula, 5200 ft., 4; 15 mi. N Tula, 1; 8 mi. N Tula, 4500 ft., 3; 9 mi. SW Tula, 3900 ft., 3.