1. LKPlDOl'HYilA. 2. XANTU^IA. 32'3 



labials, sixth largest ; mental large, triangular ; four large lower 

 labials, the two anterior forming a suture with their fellows on the 

 median line. Throat irregularly folded ; one or two transverse 

 gular folds ; gular scales uniform, granular. Body depressed ; 

 nuchal and dorsal scales irregular, granular, intermixed with tri- 

 hedral or subconical tubercles forming a regular longitudinal series 

 on each side of the vertebral line, and more or less regular transverse 

 series on the sides ; the size of these tubercles ver)' variable. 

 Ventral scales quadrangular, forming ten longitudinal and about 

 thirty transverse series. Four or more enlarged prjeanal scales. 

 Limbs well developed, the hind ones not reaching the axil when 

 extended, scaled like the body ; digits slender, compressed, bent at 

 the articulations. Three ( $ ) to sixteen { ,S) femoral pores on each 

 side. Tail cylindrical, tapering, covered with rings of smaller and 

 larger keeled scales ; when intact, its length a little exceeds that of 

 head and body. Brown above, with darker brown and yellowish 

 spots on the body and limbs ; lips with vertical dark brown bars ; 

 lower surfaces yellowish or brownish white. 



millim. millini. 



Total length 235 Fore limb 30 



Head 23 Hind limb 43 



Width of head .... 16 Tail 135 



Body 77 



Panama ; Guatemala ; South-western Mexico. 



a. §. Isthmus of Tehuantepec. Brussels Museuui [E.]. 



b-e. Hgr. Mexico. M. Sall6 [C.]. 



f. Yg. Mexico. 



ff. J. ? SirA. Sniith[P.]. (Type 



of Poriodogaster yraijii.) 



2. XANTUSIA. 



Xantusia, Baird, Proc. Ac. Philad. 1858, p. 255 ; Cojye, Proc. Ac. 

 Philad. 1883, p. 30. 



A series of small supraoculars, separating the supraciliaries from 

 the frontals ; latter two, forming a longitudinal suture ; frontopari- 

 etals large, separating the interparietal from the temporals. Dorsal 

 scales uniformly granular. A series of slightly enlarged scales on 

 the gular fold. 



California. 



1. Xantusia vigilis. 



Xantusia vigilis, Baird, I. c. 



Tliree folds on the throat, the anterior connecting the ears infe- 

 riorly and encircling the head. The adpresscd hind limb reaches 

 t,he first gular fold ; its length is contained about twice and three 



