ho found it beneath a
rock at the mouth of a heavily wooded ravine near Coalcoman at an
elevation of 950 meters. The only other known specimen is from Comala,
Colima, a village, like Coalcoman, that is located near the upper limits
of the arid scrub forest.

~Natrix valida isabelleae~ Conant

_Natrix valida isabelleae_ Conant, Nat. Hist. Misc., 126:7,
September 15, 1953.--Pie de la Cuesta, Laguna Coyuca,
Guerrero, Mexico.

Coahuayana; Playa Azul (2); Punto San Juan de Lima.

Three females and one male have, respectively, 133, 135, 135, and 131
ventrals, and 68, 68, 73, and 75 caudals. The grayish stippling on the
posterior ventral surfaces mentioned by Conant (1953:9) is not visible
on these specimens. In the small individuals from Punto San Juan de Lima
and from Coahuayana there are four longitudinal rows of dark spots on
the dorsum; in two large females from Playa Azul the spots are barely
discernible.

All of the specimens from Michoacan were found in the coastal lowlands;
those from Playa Azul were collected from a small brackish,
mangrove-lined lagoon.

~Storeria storerioides~ (Cope)

_Tropidoclonium storerioides_ Cope, Proc. Acad. Nat. Sci.
Philadelphia, 17:190, December 26, 1865.--Mexican Plateau.
Type locality restricted to Tres Cumbres, Morelos, Mexico,
by Smith and Taylor (1950a:336).

_Storeria storerioides_, Garman, Mem. Mus. Comp. Zool.,
8(3):29, June, 1883.

Dos Aguas (11); Puerto de Garnica; Tancitaro (11); Tzitzio;
Uruapan; 16 km. NW of Zacapu.

Three males and six females from the Sierra de Coalcoman have,
respectively, 122-128 (125.3) and 126-136 (130.0) ventrals, and 46-47
(46.7) and 38-42 (39.1) caudals. Four males and eleven females from the
Cordillera Volcanica have, respectively, 124-132 (128.5) and 127-139
(136.4) ventrals, and 43-48 (44.7) and 38-44 (40.2) caudals. These data
show that, although there is little difference in the number of caudals,
specimens from the Sierra de Coalcoman have fewer ventrals than do
specimens from the Cordillera Volcanica. Of eleven specimens from the
Sierra de Coalcoman, two have black bellies. Five others from the Sierra
de Coalcoman and one from Puerto de Garnica in the Cordillera Volcanica
have the bellies heavily stippled with black, giving a gray appearance.
Melanistic tendencies in this species have been discussed by Anderson
(1960:64), who examined the specimen from Tzitzio. In li