162 



6. Scales in 17 rows. 



a. Ycntrals not more than 185. 



* Parietala a little longer than their distance from the 

 internasals ; ventrals 143-163. 



7. cobella, p. 166. 



** Parietals as long as their distance from the inter- 

 nasals. 



Ventrals 150-170, with black spots . . 8. purpurans, p. 167. 

 Ventrals 141-164, unspotted, uniform, 



or edged with black 9. merremii, p. 168. 



Ventrals 165-183, unspotted, edged 



with black 10. /sca, p. 169. 



Ventrals 147-165, unspotted, outer 



ends green 11. jageri, p. 170. 



/3. Ventrals more than 185 . 12. genimaculata, p. 170. 



B. Anterior chin-shields shorter than the posterior, or tail more 

 than one fourth of the total length. 



1. Scales in 17 rows. 



a. Seven upper labials, third and fourth entering the eye. 



Frontal once and a half as long as 



broad ; subcaudals 58-71 15. ajfinis, p. 172. 



Frontal once and two thirds as long 



as broad ; subcaudals 66-75 16. pcecilopogon, p. 173. 



Frontal once and a half to once and 

 two thirds as long as broad; sub- 

 caudals 85-95 25. laureata, p. 179. 



6. Eight upper labials, fourth and fifth entering the eye. 



Ventrals 173; subcaudals 78 17. Jachrymans, p. 174. 



Ventrals 11 7-137; subcaudals 90-120. 21. decorata, p. 17<>. 



Ventrals 117 ; suboaudals 79 22. vermiculaticeps, p. 177. 



Ventrals 145-183 ; subcaudals 88- 



132 24. vittata, p. 178. 



c. Eight upper labials, third, fourth, and fifth entering the eye. 



18. undulata, p. 174. 



2. Scales in 19 rows 23. clavata, p. 177. 



3. Scales in 15 rows. 



Three postoculars 19. melanauchen, p. 175. 



Two postoculars 20. occipital, p. 175. 



II. Scales in 21 rows 26. godmani, p. 179. 



