REPTILES OF THE PACIFIC COAST. 71 



end of snout than to orbits. Plates on head moderately 

 large, smooth, and almost flat; interparietal largest. 

 Frontal plate usually divided transversely. Inner series 

 of enlarged supraoculars separated from frontal, fronto- 

 parietal, and parietal plates by one or two rows of gran- 

 ules. Superciliaries long, very slightly projecting 

 laterally, and strongly imbricate. Middle subocular 

 very long, narrow, and strongly keeled. Rostral very 

 wide and not very low. Four to seven long, low supra- 

 labials. Symphyseal plate moderately large and followed 

 by series of large plates in contact with first pair of 

 lower labials but separated from the others by one or 

 two rows of sublabials. Chin and gular region covered 

 with smooth subhexagonal granules, largest centrally 

 and becoming imbricate on the strong transverse fold. 

 Edge of fold with a series of projecting scales. Ear- 

 opening large, with an anterior denticulation of from 

 two to five pointed scales of much variation in size and 

 shape. Two rows of medium- 

 sized scales along middle of back, 

 bordered on each side by two rows 

 of much larger scales. Other dor- m^W^^mu^SMM 

 sal scales very small, except a 



row of widely separated enlarged scales on upper of two 

 lateral dermal folds. Tail bearing whorls of strongly 

 keeled and sharply pointed scales much broader 

 above than below. Posterior surface of thighs 

 and arms covered with small granules similar to those 

 on sides of body. Superior and anterior surfaces of 

 limbs provided with large keeled scales. Ventral scales 

 smooth and about size of those on edge of gular fold. 

 Femoral pores varying from ten to fourteen in number 

 on each thigh. Thirteen to seventeen of largest dorsal 

 scales equaling length of shielded part of head. Tail 



