s Potos['i]), which have 24 to 31 (average 27.7) dorsal
body-blotches and 6 to 10 (average 7.8) scales in the first interspace.
Likewise, there is a difference in the number of ventrals between the
northern and southern samples; those from the north have an average of
228.8 ventrals, and those from the south have 222.0. In all of these
characters the southern sample shows trends towards the southern
subspecies, _deppei_, which has fewer ventrals, fewer scales in the
first interspace, and more dorsal body-blotches.

_Distribution._--Eastern part of the Mexican Plateau and lower leeward
slopes of the Sierra Madre Oriental from Hidalgo and Queretaro northward
to southeastern Coahuila.

_Specimens examined._--Total of 28, as follows: _Coahuila_: Buena Vista,
USNM 1522; 50 km. W of La Rosa, EHT-HMS 5374. _Hidalgo_: Ixmiquilpan,
USNM 110890-1; 24 km. S of Ixmiquilpan, EHT-HMS 5373; Jacala, UMMZ
80937; 35 km. E of Pachuca, UMMZ 99552; 16 km. E of Tulancingo, KU
40357. _Nuevo Le['o]n_: Ojo de Agua near Galeana, CNHM 33564-5.
_Queretaro_: Cadereyta, UMMZ 99791-3. _San Luis Potos['i]_: Charcas,
UMMZ 77256-8; San Diego, UMMZ 77254-5; 24 km. NE of San Luis Potos['i],
UIMNH 18711; 30 km. NE of San Luis Potos['i], UIMNH 27150, 28135.
_Tamaulipas_: Miquihuana, MCZ 19544-50.

=Pituophis lineaticollis lineaticollis= Cope, new combination

_Arizona lineaticollis_ Cope, Proc. Acad. Nat. Sci. Philadelphia,
p. 300, 1861.

_Pituophis lineaticollis_, Stull, Occas. Papers Mus. Zool. Univ.
Michigan, no. 250, p. 2, October 12, 1932, Bull. U. S. Natl. Mus.,
no. 175, p. 47, April 23, 1940.

_Pituophis deppei lineaticollis_, Smith, Proc. U. S. Natl. Mus.,
vol. 93, p. 460, 1943; Smith and Taylor, Bull. U. S. Natl. Mus.,
no. 187, p. 108, 1945.

_Pituophis deppei brevilineata_ Schmidt and Shannon,
Fieldiana-Zool., vol. 31, p. 79, February 20, 1947.

_Type._--No type specimen is known. Cope (1861: 300 and 1887: 72) stated
that the specimen was from the southern Mexican Plateau and that it was
collected by Carlos Sartorius. Smith and Taylor (1945: 108 and 1950:
348) gave the type locality as Jalapa, Veracruz. Although this locality
was the source of many specimens sent to the United States by Sartorius,
it is not within the known range of _lineaticollis_, and therefore
cannot appropriately be thought of as the type locality. In the absence
of a type specimen and a justifiable type locality, I