In Tamaulipas two and possibly three subspecies of _Canis latrans_
occur. _C. l. texensis_ is known only from the northwesternmost part of
the state, and _C. l. microdon_ occurs from Camargo south to Nicolas.
Hall and Kelson (1959:845) guessed that _C. l. cagottis_ would be found
in the southern third of the state; as yet specimens from there have
not been obtained and the subspecific identity of the coyotes there, if
any are present, remains in doubt.
=Canis latrans microdon= Merriam
1897. _Canis microdon_ Merriam, Proc. Biol. Soc. Washington,
11:29, March 15, type from Mier, on Rio 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 Nicolas 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; Nicolas, 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).
=Canis lupus monstrabilis= Goldman