CROCODILIANS, LIZARDS, AND SNAKES 



329 



LYSOPTYCHUS LATERALIS Cope. 



LysoptycUus lateralis Cope, Proc. U. S. Nat. Mus., XI, 1888, p. 397. 



Integument of side of neck thrown into numerous folds. The most 

 l)rominent is continuous Avith the collar fold, and it sends out two folds 

 forward to the tympanic meatus. A second fold is concentric witli the 

 humerus at its anterior base; its superior x)art is ijrominent and longi- 

 tudinal, and continues to the fold in front of it. Tail round. 



The scales of the sides are smaller than those of the belly, which are 

 smaller than those of the back. The latter are rather small, counting 

 seventeen longitudinal rows between the small -lateral scales of the 



1^^^^ 





Fig. 47. 

 LYSOPTYCHUS LATEKALIS COPE. 



X 2. 

 San Diego, Texaa. 



scapular regions. The keels of the dorsal scales are in parallel lines. 

 Scales of the tail subequal, strongly keeled, except below. Fifteen 

 femoral pores. Two postanal plates. 



Interparietal plate large, subround; parietals small, subpyriform, 

 one fifth as large as the interparietal. Five or six transverse supra- 

 orbital plates, separated from the i'rontals by one row and from the 

 superciliaries by two rows of scales. Frontal divided transversely, 

 the anterior part divided longitudinally. These plates are ])receded 

 by two plates, and these by three in transverse relation; two large 

 internasals separated from the rostral by two small scales. All the 

 scales of the head smooth. 



Color above brown, with laint traces of small darker brown spots. 

 Sides blackish, the prominent parts of the folds of the neck paler. 



