258 UROPELTIDJE. 



Synopsis of the Species. 



A. 19 scales round middle of body. 

 a. Upper surface of tail convex. 



rt'. ] 98-218 ventrals ; diameter of body 30 



to 40 times in total length S. graniUs, p. 261. 



b'. 163-178 ventrals ; diameter of body 23 



to 30 times in total lengtli 'S'. ni(jra, p. 263. 



h. Tail with a flat disk of strongly keeled 

 scales ; 203-230 ventrals ; diameter of 



body 34 to 40 times in total length S. browjhamt, p. 264. 



13. 17 scales round middle of body. 



a. Rostral entirely separating nasals. 



«'. 141-166 ventrals ; diameter of body 22 



to 31 times in total length ; eve not 



half length of ocular 'S'. inelanogasler, p. 260. 



b'. 170-180 ventrals ; diameter of body 30 



to 38 times in total length ; eye half 



length of ocular 'S'. imhieyensis^ p. 260. 



b. Jsasals in contact behind the rostral. 

 a'. Eye not half length of ocular shield. 



a". Portion of rostral seen from above 

 as long as its distance from frontal, 

 or shorter ; snout obtuse. 

 a. Tail round or slightly compressed ; 

 up])er caudal scales distinctly 

 keeled ; terminal scute Avithout 

 distinct points ; 151-180 ven- 

 trals ; diameter of body 25 to 33 



times in the total length <S'. petersii, p. 261. 



/S. Tail round or slightly compressed ; 



upper caudal scales smooth or 



faintly keeled ; terminal scute 



very small and bicuspid. 



a. 154-165 ventrals ; diameter of 



body 27 to 35 times in total 



leno'th 'S'. maculata, p. 261. 



fi'. 174-188 ventrals ; diameter of 

 body 32 to 38 times in total 



length 'S'. Hum, p. 262. 



y. Tail with a flat disk of strongly 

 keeled scales ; 165-172 ventrals ; 

 diameter of body 30 to 33 times 



in total length ~ 'S'. rubroUncata, p. 266. 



b". Portion of rostral visible from above 

 lon"-er than its distance from fron- 

 tal; upper caudal scales strongly 

 keeled. 

 a. Rostral not more than one third 

 the length of shielded part of 

 bead. 

 a. 193-234 \entrals ; diameter of 

 body 30 to 46 times in total 

 length ; eye hardly one third 



length of ocular. .'. S. oceUata, p. 262. 



j3'. 184-195 ventrals ; diameter of 



