6. ('NEMID0PH0RU3. 369 



gular scales gradually enlarged ; mesoptychiura with three or four 

 rows of enlarged scales, the posterior largest, a little larger than the 

 largest gulars ; the mesoptychial scales forming the border of the 

 collar. Dorsal granules extremely minute, smooth. Ventral plates 

 in eight longitudinal and thirtj'-six to thirty-eight transverse rows. 

 Three large praeanals, forming a triangle. Four or five rows of 

 brachials, anterior largest, continuous with the postbrachials ; ante- 

 brachials continuous with brachials, in three rows, the outer largest ; 

 enlarged scales under the fore arm. Eight to ten rows of femorals 

 one of which is large ; tibials in two or three rows, outer largest. 

 Femoral pores nineteen to twenty-two. Males without anal spines. 

 Caudal scales slightly oblique, feebly keeled, not pointed posteriorly. 

 Olive or reddish brown above, the sides largely spotted or marbled 

 with black, the spots sometimes forming vertical bars on the flanks ; 

 young with six light longitudinal lines, as in C. sexlineutus, which 

 gradually disappear ; hind limbs with round light spots ; belly 

 blackish blue in males. 



millim. millim. 



Total length 383 From end of snout to fore 



Head 30 limb 46 



Width of head 17 From end of snout to vent 123 



From end of snout to inter- Fore limb 45 



parietal plate 22 Hind limb 86 



Width at posterior corners Tail 260 



of supraocular regions . . 11 



Tres Marias Islands. 

 a-e. J, hgr., & yg. Tres Marias Islands. Hr. A. Forrer [C.]. 



7. Cnemidophorus maximus. 



Cnemidophorus maximus, Cope, Proc. Ac. Philad. 1803, p. 104. 



Nostril anterior to nasal suture. Four supraoculars ; anterior 

 gulars abruptly larger, their median largest ; plates of the collar 

 graduating into the posterior gulars, the marginal largest, the series 

 concave anteriorly in the middle. Dorsal scales minute. Ventral 

 plates in eight rows. Prseanals in four transverse series, the 

 posterior two containing six. Brachials in seven rows ; antebrachials 

 in four ; femorals in seven ; tibials in four. Above olive-brown, 

 with three brown bands on each side, which are as wide as the 

 intervals between them, and are so broken by spots of the ground- 

 colour as to resemble scries of confluent brown variegations ; posterior 

 extremities coarsely reticulate with the same colour ; superior 

 surface of tail and gular region bhickisli, varied ; abdominal shields 

 black-tipped. 



From end of snout to guLir fold 4 centim. ; from gular fold to 

 vent 8 ; from vent to end of tail 22. 



Cape St. Lucas, California. 

 VOL. n. 2 B 



