1897. Canis microdon Merriam, Proc. Biol. Soc. Washington, 11:29, March 15, type from Mier, on Río Grande, Tamaulipas.
1932. Canis latrans microdon, Nelson, Proc. Biol. Soc. Washington, 45:224, November 26.
Distribution in Tamaulipas.—Probably state-wide, reported only from the northern half of the state.
Three specimens were examined. One is a pup from the vicinity of Padilla which is assigned to this subspecies on geographic grounds. The other two are skins, collected at Nicolás by natives, who deceived the collector by providing dog skulls with the coyote skins. These two specimens are referred to C. l. microdon on the basis of their dark color and dusky shading on the throat and chest. One has a rufous over-all color and the other is ochraceous yellowish. This difference in color suggests intergradation at this place between C. l. microdon that ranged to the northeast, C. l. cagottis to the south, and probably with C. l. impavidus distributed to the west.
Records of occurrence.—Specimens examined, 3: 9-1/2 mi. SW Padilla, 800 ft., 1; Nicolás, 53 km. N Tula, 2.
Additional record: Camargo (Jackson, 1951:305); 20 mi. W Reynosa (Ingles, 1959:401); Matamoros (Jackson, 1951:305); Bagdad (ibid.); Sierra San Carlos (San Miguel, El Mulato) (Dice, 1937:251).
Canis latrans texensis V. Bailey
1905. Canis nebrascensis texensis V. Bailey, N. Amer. Fauna, 25:175, October 24, type from 45 mi. SW Corpus Christi at Santa Gertrudis, Kleberg Co., Texas.
1932. Canis latrans texensis V. Bailey, N. Amer. Fauna, 53:312, March 11.
Distribution in Tamaulipas.—Extreme northwest, known only from Nuevo Laredo (Jackson, 1951:279).