1906.] IX MEXICAX LIZARDS. 367 



mottled witli blackish. Although much black pigment may become 

 deposited, it is always restricted to the deeper strata, so that the 

 under parts never appear dai-k. The light stripe behind the tail 

 is invariably broken up. The under surface of the tail is Avhite 

 to yellowish flesh-colour. 



Remarks iqyon the Pattern prevailing in various Localities. 



Cuernavaca (text-fig. 83 0, D). — The 6 principal stripes remain 

 intact, except in specimens with many yellow spots on the rump, 

 when stripe 1 is broken into white beads ; and in some old males 

 the black cross-bars invade the stripe 3. Even in the oldest 

 specimens the black and brown cross-bars are mostly confined to 

 their respective fields. In one handsome male the upper chest is 

 mottled pink and blue. 



Cuautla. — None reaches the stage in which the stripes are 

 anywhere destroyed. The lai-gest male shows no cross-bars, only 

 double spots. 



Jojutla. — Striped ; nowhere with white spots. 



Ixtla and Iguala (text-fig. 83 E, F, G). — In old males the 

 stripes are very dull ; black and light cross-bars encroach upon 

 the stripes, producing tiger-bars; with or without numerous 

 small white spots on i-ump and thighs. 



Rio Balsas (text-fig. 83 A). — The stripes vanish into the ashy- 

 brown or olive-grey ground-colour, which becomes studded with 

 numerous small black spots on the back. On the flanks and 

 sides of the trunk short irregular black bars alternate with grey 

 or whitish short bars. There are no whitish spots on rump, thigh, 

 or tail. 



These Balsas specimens, in their isolation, are remarkable for 

 their general coloration and pattern, combined with a rather high 

 number of femoral scales and pores. 



Ch-xlpancingo. — Pale grey and black tiger-bars combined with 

 vanishing first and second stripes are rather prevalent. Pale 

 small spots are restricted to the hind limbs. The number of 

 femoral pores is rather low. 



TsssBLL irra-Group. 



Specimens examined : — 

 C. inrplexus. 2, Brit. Mus., 72 and 69 mm. ; from Bernalillo 



Co., New Mexico. 

 C. tessellatus. 2, Brit. Mus., 56 and 92 mm,; from Aiizona, or 

 New Mexico ? 

 1, Brit. Mus., 82 mm.; from Julian Mountains, 

 Cal. (C. stejnegeri.) 



1 , Field Mus., 93 mm. ; from El Paso. (C. multi- 

 scutatus.) 



C. maximus. 2, Brit. Mus. 



C.melanostetlvus. 2, Brit. Mus. ; Foi-t Lowell, Arizona. 



2, Field Mus. ; Lerdo, Durango-Coahuila. 

 (C. variolosus.) 



