82 



LACEETID^. 



6. Lower eyelid with a semitransparent disk formed of 

 several small scales ; dorsal scales perfectly smooth. 



Frontonasal shield separated from the 



rostral , 14. hurchdlii, p. 95. 



Frontonasal in contact with the rostral. . 15. cajiensis, p. 1)6. 



II. Yentral plates forming very irregular or oblique longitudinal 

 scries, converging posteriorly ; occipital absent ; lower nasal 

 forming a suture with the two or three anterior labials. 



A. Xot more than 30 gular scales on a line extendino; from the 



collar to the suture between the chiu-shiclds. 



o 



1. 15 to 25 femoral pores on each side ; subocular bordering 



the lip. 



The length of the foot in the adult less 



than the distance between the collar- 

 fold and the nostril ; 50 to G5 scales 



(counting from the ventrals) across 



the middle of the body 16. velox, p. 97. 



The length of the foot equals the distance 



between the collar-fold and the nostril 



or the end of the snout ; 45 to 50 



scales across the middle of the body. . 17. fasciata, p. 99. 



2. 8 to 15 femoral pores on each side. 



a. The distance between the loreal and the anterior supra- 



ocular is less than the length of the latter shield. 



Nasals swollen , 18. intermedia, p. 100. 



Nasals not swollen 21. rnultiocellata, p. 103. 



b. The distance between the loreal and the anterior supra- 



ocular equals or exceeds the length of the latter shield. 



Ventral plates 16 to 20 iu the longest 



transverse series 19. arguta, p. 101. 



Ventral plates 12 or 14 in the longest 



transverse series ; frontonasal divided. 20. argus, p. 102. 



B. More than 30 gular scales between the collar and the suture 

 between the chin-shields. 



Supraoculars in contact with the frontal ; 



four pra3frontals ; ventral plates 14 



or 16 in the longest transverse series; 



13 femoral pores on each side 22. quadrifrons, p. 105. 



Supraoculars in contact with the frontal ; 



two pnef rentals ; ventral plates 16 to 



20 in the longest transverse series ; 11 



to 17 femoral pores 23. przewalskii, p. 105. 



