20); Jazmin (3); La Placita (8);
La Playa (14); La Salada (6); Lombardia (5); Nueva Italia
(14); Ojos de Agua de San Telmo (2); Oropeo (3); Ostula;
Punta de San Telmo (3); Rio Cancita, 14 km. E of Apatzingan
(13); Rio Marquez, 10 km. S of Lombardia (10); Rio Marquez,
13 km. SE of Nueva Italia (3); San Juan de Lima (2); Santa
Ana (2); Tafetan (2); Tepalcatepec (2); Tzitzio (6); Volcan
Jorullo (3).

This small species is extremely common in the Tepalcatepec Valley and
noticeably less so on the coast. It is usually found on the ground in
rocky areas, but males frequently have been seen on the trunks of low
trees in the scrub forest. Altitudinally, it ranges from sea level to
slightly more than 1000 meters. The sexes are readily distinguished in
the field (Oliver, 1937; Smith, 1939; Duellman, 1954b). In the dry
season only males were observed in the Tepalcatepec Valley, but in the
rainy season both sexes were found in approximately the same numbers.

~Sceloporus scalaris scalaris~ Wiegmann

_Sceloporus scalaris_ Wiegmann, Isis von Oken, 21:370,
1828.--Mexico. Type locality restricted to Mexico, Distrito
Federal, by Smith and Taylor (1950b:137).

_Sceloporus scalaris scalaris_, Smith, Occ. Pap. Mus. Zool.
Univ. Michigan, 361:2, December 15, 1937.

Carapan (2); Cheran; Ciudad Hidalgo; Huingo (3); Jacona (3);
Jiquilpan (2); Lago de Camecuaro (2); Lago de Chapala; Lago
de Cuitzeo (5); Morelia (4); Patzcuaro (4); Querendaro;
Quiroga; Tacicuaro (5); Tarecuaro; Zacapu (4); Zamora (4);
Zinapecuaro (11).

This small terrestrial species does not seem to be abundant anywhere in
the state. It sometimes is found in open pine, oak, or pine-oak forest,
but usually it is observed in areas supporting bunch grass. In such
places the lizards sun and forage on the open ground and quickly take
refuge in the large clumps of grass. Altitudinally, the species ranges
from 1550 to 2300 meters. Although _Sceloporus scalaris scalaris_ has
been found in association with _S. dugesi intermedius_, _S. spinosus_,
and _S. torquatus_, it does not seem to form any close ecological
association with any of these species. In the pine forests of the
Cordillera Volcanica _S. s. scalaris_ is replaced by _Sceloporus aeneus
aeneus_, another small terrestrial species that occurs in great
abundance throughout the coniferous forests of the Cordillera Volcanica.

~Sceloporus