39. CACURYX. — 40. HOPLOCERCUS. 199 



lamellae inferiorly. A short series of femoral pores. Tail very short, 

 flattened, with whoi'ls of large spines on its upper surface. Lateral 

 teeth tricuspid. 

 Yucatan. 



1. Cachryx defensor. 



Cachryx defensor, Cope, 1. c, and Proc. Am. Phil. Soc. 18G9, pi. x. ; 

 Bocourt, I. c. 



Head longer than broad ; loreal region concave ; nostril on canthus 

 rostralis, lateral ; tympanum as large as the eye, without marginal 

 serrations ; upper head-scales small, uniform, a little enlarged on 

 the snout ; no enlarged occipital. Sides of neck plicate. Scales of 

 body small, slightly imbricate, homogeneous, smooth, in transverse 

 and oblique longitudinal series, larger on the rump, smaller on the 

 sides ; a slightly larger vertebral series ; ventral scales smooth, as 

 large as dorsals. Scales of fore limb moderate, some of those of 

 femur and tibia much larger, spiuiferous. Digits short. Femoral 

 pores six to nine. Tail shorter than the body ; caudal whorls fif- 

 teen, the scales below narrowed, keeled, the carina prolonged into a 

 flat spine ; spinifcrous superior whorls seven, spines nearly erect, 

 those of the median row smaller. Bright olivaceous ; shoulder and 

 two bands on humerus, and the anterior part of dorsum, with inter- 

 scapular region, black, the latter with two cross series of green 

 spots, more or less distinct on the whole body in younger specimens ; 

 in older specimens median dorsal region bright rufous. 



millim. millim. 



Total length 215 From snout to vent . . 127 



From snout to gular fold 41 Fore limb 54 



Yucatan. 



40. HOPLOCERCUS. 



Hoplocercus, Fitzing. Syst. Rept. p. 78 ; A. Dum. Arch. 3Ius. viii. 



p. 561. 

 Pachycercus {Diigh ^- Brae), A. Dion. Rev. <§• Mag. Zool, vi. 1854, 



p. 558. 



Tympanum distinct. Body depressed ; no dorsal crest ; dorsal 

 lepidosis heterogeneous. Upper head-scales small. A strong trans- 

 verse gular fold ; no gular sac. Digits compressed, with keeled 

 lamellae interiorly. A few femoral pores. Tail short or moderate, 

 flat, or cylindrical, with whorls of spinose scales. Lateral teeth tri- 

 cuspid ; pterygoid teeth. No sternal fontaneUe. Abdominal ribs. 



South America. 



1. Hoplocercus spinosus. 



Hoplocercus spiuosus, Fitzing. I. c: A. Din». I. c. p. .502. 

 Pacliycercus aculeatus {Dugka 8j Brae), A. Dum. I. c. pp. 239, obi, 

 pi. xii. 



