om the northern part of the range are more
rugose and have larger blue ventral patches and less gular stippling
than those from the south.

In Michoacan _Urosaurus bicarinatus tuberculatus_ is found in wooded
areas, not in open scrub forest, in the coastal area to elevations of
about 900 meters, and along the slopes of the Cordillera Volcanica and
the southern edge of the Mexican Plateau at elevations from 1000 to 1700
meters. The record for Tupataro probably is erroneous, for no other
specimens of this species are known from the central plateau.
Essentially, the distribution of this species parallels that of
_Sceloporus utiformis_, a strictly terrestrial species. _Urosaurus
bicarinatus tuberculatus_ lives on tree trunks. Below 1000 meters in the
Tepalcatepec Valley _Urosaurus bicarinatus tuberculatus_ is replaced by
_Urosaurus gadowi_.

~Urosaurus gadowi~ (Schmidt)

_Uta gadovi_ Schmidt, Amer. Mus. Novitates, 22:3, December
1, 1921.--Cofradia, Jalisco, Mexico (in error) = Cofradia,
Michoacan, Mexico (Duellman, 1958b:49).

_Urosaurus gadowi_, Mittleman, Bull. Mus. Comp. Zool.,
91:154, September, 1942.

Acahuato (2); Apatzingan (56); 12-16 km. S of Apatzingan
(12); Buenavista (7); Capirio (23); Cofradia (21); El Sabino
(13); Guayabo; Jazmin; La Playa; La Salada (3); Nueva Italia
(7); Rancho Nuevo; Rio Cancita, 14 km. E of Apatzingan (5);
Rio Marquez, 10 km. S of Lombardia (2); Rio Marquez, 13 km.
SE of Nueva Italia (3); San Salvador (2); Santa Ana;
Tepalcatepec; Volcan Jorullo (3); Zicuiran (2);
Ziracuaretiro.

Although individuals of this species have been collected at elevations
slightly exceeding 1200 meters on Volcan Jorullo and at 1100 meters at
Ziracuaretiro on the southern slopes of the Cordillera Volcanica, for
the most part these lizards are found at elevations of less than 800
meters, where they inhabit the open arid scrub forest of the
Tepalcatepec Valley, a region to which this species is endemic
(Duellman, 1958b:49). These small lizards usually are found on the
trunks and main branches of the small trees in the scrub forest; in this
habitat they are associated with _Sceloporus horridus oligoporus_, a
much larger species.

Males have a pale orange spot on the throat and a pale blue belly;
females have immaculate venters.

A specimen from Guayabo on the northern slopes of the Sierra de
Coalcoman was referred to _Urosaurus irregulari