Four specimens from 21
kilometers north of Norelia (UIMNH 6952 and UMMZ 104743) have 89, 78,
92, and 84 granules; one from Morelia (UMMZ 104742) has 78; two from
Araro (UMMZ 119522) have 80 and 87; one from Jacona (UIMNH 24703) has
88.

Since no large adult males are present in the series from Michoacan, an
adequate comparison of coloration between these and populations on the
northern part of the Mexican Plateau cannot be made. _Cnemidophorus
scalaris_ is a name applied to the lizards inhabiting the Mexican
Plateau from Chihuahua south to Puebla by Zweifel (1959a:72). It is
doubtful if all of the populations assigned to this subspecies belong
there; possibly more than one species is involved, but the paucity of
material prevents further analysis at this time.

~Heloderma horridum horridum~ (Wiegmann)

_Trachyderma horridum_ Wiegmann, Isis von Oken, 22:421,
1829.--Mexico. Type locality restricted to Huajintlan,
Guerrero, Mexico, by Smith and Taylor (1950b:193).

_Heloderma horridum horridum_, Bogert and Martin del Campo,
Bull. Amer. Mus. Nat. Hist., 109:20, April 16, 1956.

Apatzingan; Coalcoman; La Placita; Oropeo; Paracuaro.

This species is known from elevations of less than 1000 meters in the
Tepalcatepec Valley, the Sierra de Coalcoman, and the coastal lowlands.
Specimens from Coalcoman, La Placita, and Paracuaro came from areas of
dense woods; those from Apatzingan and Oropeo might have come from
patches of dense woods in the otherwise open scrub forest of the
Tepalcatepec Valley.

~Gerrhonotus imbricatus imbricatus~ Wiegmann

_Gerrhonotus imbricatus_ Wiegmann, Isis von Oken, 21:379,
1828.--Mexico. Type locality restricted to Mexico, Distrito
Federal, by Smith and Taylor (1950b:201).

_Gerrhonotus imbricatus imbricatus_, Dunn, Proc. Acad. Nat.
Sci. Philadelphia, 88:475, October 20, 1936.

Acuaro de las Lleguas (9); Cerro Barolosa (4); Cerro
Tancitaro (36); Dos Aguas (22); Paracho; Sierra Patamba;
Tinguidin; Zacapu.

Specimens from the Sierra de Coalcoman are noticeably different from
those inhabiting the mountains rising from the Mexican Plateau. Of 45
specimens from Cerro Tancitaro and adjacent areas on the Mexican Plateau
and in the Cordillera Volcanica, 15 have twelve longitudinal rows of
dorsal scales and 30 have fourteen rows. Of seven specimens from the
state of Mexico, 5 have twelve rows and 2 have fourteen; of nine
sp