366 TEno^. 



n 

 Var. mexicanus. 



Cnemidop bonis mexicanus, Peters, Mon. Berl. Ac. 1869, p. 62. 



? Cnemidophorus communis, Cope, Proc. Amer, Philos. Soc. svii. 1877. 



p. 95. 

 Cnemidopliorus sexlineatus, var. mexicanus, Bocourt, 31iss. Sc. Mex., 



Pept. p. 281, pi. XX. c. fig. 7, 



Size larger. Head rather more elongate. Brown above, with 

 three white lines on each side, the interspaces between them blackish 

 and, in males, white spotted ; in the latter the longitudinal lines 

 more or less broken up into spots ; lower surfaces white, spotted 

 with black in the males. 



millim. millim. 



Total length 303 254 



Head 22 17 



Width of head 13-5 lO'o 



From end of snout to interparietal 



plate 17 13 



"Width at posterior corners of supra- 

 ocular region 9 7 



From end of snout to fore limb . . 33 25 



From end of snout to vent 93 74 



Fore limb 28 26 



Hind limb 63 55 



TaU 210 180 



Mexico. 

 a-f. (S, $ , it hgr. Presidio, W. Mexico. Hi-. A. Forrer [C.]. 



^^ir^angusticeps, 



Cnemidophorus angusticeps, Cope, Proc. Amer. Philos. Soc. xvii. 1877, 

 p. 9.J. 



Differs from C. sexlineatus in the very narrow parietal plates. 

 The light bands are much wider than the interspaces, and send off 

 lateral processes, which give the dark ground-colour a very broken 

 character; the colour of the bands is an olive-green. The adult 

 male of about the size of C guttatus. 



Yucatan. 



-¥aF.^j50status. 



Cnemidophorus costatus, Cope, Proc. Amer. Philos. Sue. xvii. 1877, 

 p. 95. 



Resembles the last two in general characters, but differs in the 

 shorter head, and strikingly in the coloration. Brown, with black 

 cross bauds on sides, which join across the middle line on the lumbar 

 region ; sacral region and femora white spotted. 



Mexico, 



