Acahuato (2); Apatzingán (56); 12-16 km. S of Apatzingán (12); Buenavista (7); Capirio (23); Cofradía (21); El Sabino (13); Guayabo; Jazmin; La Playa; La Salada (3); Nueva Italia (7); Rancho Nuevo; Río Cancita, 14 km. E of Apatzingán (5); Río Marquez, 10 km. S of Lombardia (2); Río Marquez, 13 km. SE of Nueva Italia (3); San Salvador (2); Santa Ana; Tepalcatepec; Volcán Jorullo (3); Zicuiran (2); Ziracuaretiro. Although individuals of this species have been collected at elevations slightly exceeding 1200 meters on Volcán Jorullo and at 1100 meters at Ziracuaretiro on the southern slopes of the Cordillera Volcánica, 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 Coalcomán was referred to _Urosaurus irregularis_ (Fischer) by Peters (1954:15). I have studied this specimen (BMNH 1914.1.28.110), a female having a snout-vent length of 46 mm., and agree with Peters that it closely resembles Fischer's description and figure (1882: pl. 17, fig. 1). This specimen and those seen of _Urosaurus gadowi_ all have pavementlike enlarged dorsal scales that are complete across the vertical line. In _U. gadowi_ the enlarged dorsals usually are in four to six irregular rows; in the specimen from Guayabo the dorsals are in two rows. Although none of the other specimens of _U. gadowi_ examined has only two rows of enlarged dorsals, I prefer to consider the specimen from Guayabo as an aberrant individual of that species, rather than _U. irregularis_. Guayabo is in the known range of _U. gadowi_. _Urosaurus irregularis_ is known only from the type specimen in the Bremen Museum; the type locality, according to Fischer (1882:232), is "Aus dem Hochlande von Mexico." If an examination of the type specimen of _U. irregularis_ shows it to be identical with _U. gadowi_, then _U. irregularis_ would be the name for the lizards here referred to _U. gadowi_. ~Mabuya brachypoda~ Taylor _Mabuya brachypoda_ Taylor, Univ. Kansas Sci. Bull., 38 (1):308, December 20, 1956.--Four kilometers east-southeast of Los Angeles de Tilarán, Guanacaste, Costa Rica. El Sabino (42); La Placita; Playa Azul; Tzitzio (3).