th, Univ. Kansas Sci.
Bull., 24:663, February 16, 1938.

Cojumatlan (6); Jiquilpan (11); Lago de Camecuaro; Lago de
Chapala; Morelia (23); Patzcuaro (84); Quiroga (35); Sahuayo
(4); Tacicuaro (2); Tangamandapio (17); Tangancicuaro (9);
Zacapu (4); Zamora (11); Zinapecuaro (9).

This lizard is strictly an inhabitant of the Mexican Plateau, where it
is found in rocky places, sometimes in pine-oak forest, but more
frequently in mesquite-grassland. It is a terrestrial species, and is
most often seen on rock fences at elevations of 1500 to 2200 meters.

This species differs from _S. bulleri_ and _S. torquatus_ in having two
rows of supraoculars, instead of one; also it has more dorsal scales.
Twenty-six specimens of _Sceloporus dugesi intermedius_ from
Tangamandapio and Tangancicuaro have 44-48 (45.7) dorsal scales, as
compared with an average of 38.7 in _S. bulleri_ and 29.3 in _S.
torquatus_. In life _Sceloporus dugesi intermedius_ has a dull greenish
gray dorsum; in males the belly patches are bright blue bordered
medially by black, and the throat is bluish gray. The largest specimen
examined is a male having a snout-vent length of 80 mm.

~Sceloporus gadowae~ Boulenger

_Sceloporus gadoviae_ Boulenger, Proc. Zool. Soc. London,
1905, 2:246, October 7, 1905.--Mezquititlan, Guerrero,
Mexico.

Chupio; El Sabino (77); La Playa (6); Rio Marquez, 10 km. S
of Lombardia (11).

Although this species has a rather extensive range in the
Balsas-Tepalcatepec Basin in the state of Michoacan, Guerrero, Morelos,
and Puebla, it is only locally abundant in that area. Usually these
lizards are found on rocky cliffs in which there are many crevices for
cover. _Sceloporus gadowae_ is abundant on a conglomerate cliff along
the Rio Marquez south of Lombardia. Although the closely related _S.
pyrocephalus_ is abundant in the stream valley and in the hills above
the cliff, _S. gadowae_ has been found only on the cliff; few
individuals of _S. pyrocephalus_ have been observed on the cliff. A
similar situation was discovered on a much more extensive conglomerate
cliff along the Rio Balsas near Mexcala, Guerrero. Near Tehuitzingo,
Puebla, where _S. pyrocephalus_ was not found, _S. gadowae_ was found on
conglomerate cliffs. Probably there is strong competition between the
two species; possibly this has resulted in the restriction of _S.
gadowae_ to isolated cliff-habitats within the extensiv