62 



COLTJT5KIDJ5. 



Scales in 19 rows ; ventrals 260 : 



entire ; subcaudals 116 ; one prse- 



ooular, not extending to upper 



surface of head 18. flavescens, p. 77. 



Scales in 19 rows ; ventrals 240 ; anal 



divided ; subcaudals 133 ; two prse- 



oculars, extending] to upper surface 



of head 19- pMli^^inus, p. 77. 



Scales in 21-25 rows ; ventrals 265- 



274 ; anal divided ; subcaudals 123- 



147; one or two prseoculars, not 



extending to upper surface of head. 20. Uandingii, p. 77. 

 Scales in 23-25 rows ; ventrals 248- 



290 ; anal entire ; subcaudals 114- 



156 ; one prseocular, extending to 



upper surface of head ; rostral 



scarcely visible from above 21. cynodon, p. 78. 



B. Posterior chin-shields not or but slightly larger than the 

 anterior ; scales in 25 to 31 rows ; ventrals 254-270 ; anal 

 entire ; subcaudals 103-131 . . 22. forstenii, p. 80. 



Tabie showing Nttmbebs op Scales and Shields. 



1. Dipsadomorphus trigonattis. 



Mussell, Ind. Serp. i. pi. xv. (1796). 



Coluber trigonatus, Sckneid. in JBechst. Uebers. LacSp. iv. p. 156 

 (1802). 



