524 CALIFORNIA ACADEMY OF SCIENCES. 



hexagonal frontonasal. Behind this are two prefontals 

 (in contact), bordered posteriorly by the single broad 

 frontal and the first superciHary plates. Each of the two 

 frontoparietal plates forms sutures with the frontal, second, 

 third and fourth superciharies, first supratemporal, parie- 

 tal, interparietal and its fellow of the opposite side. The 

 parietals and the very large interparietal are bordered 

 behind by the two large occipitals. A row of small supra- 

 temporal scutes lies along the outer edge of the occipital 

 and parietal plates. The two large loreals are in contact 

 below with the superior labials, and above with the fronto- 

 nasal and prefontal plates. In front of the first loreal is a 

 large postnasal. A series of small plates, the upper of which 

 are the superciharies, usually surrounds the eye. Be- 

 tween this ring and the larger loreal are two or three small 

 plates. There are four or five superior and three or four 

 inferior labials to a point below the pupil. The eye is 

 large, without Hds, and with vertical pupil. Its diameter 

 is contained about twdce in the distance from the end of 

 the snout to the orbit. The obhque ear opening has a 

 very weak anterior denticulation. The inferior labials 

 are in contact with the large sublabials. The first pair of 

 the latter are in contact on the median hne. The back, 

 sides, upper and posterior surfaces of the limbs, and the 

 gular regions, are covered with subhexagonal granules. 

 There is a series of large plates along the edge of the 

 last gular fold. The quadrate ventrals are in twelve longi- 

 tudinal and twenty-seven to thirty transverse rows. The 

 large preanal plates are arranged in two series of two 

 each, sometimes surrounded by a few smaller scales or 

 granules. The tail is conical, and covered with whorls of 

 smooth scales, which are very narrow and transversely 

 convex. Its length is very variable. Six to ten femoral 

 pores form a series along each thigh. 



