8. LYUOSOMA. 213 



/3, 22 to 34 scales round the body. 



* JFrontonasal forming a suture with the frontal. 



t Caudal scales smooth. 



t No regular nuchals ; three or more pairs of scales 

 bordering the pariotals. 



Ear-opening as large as or a little smaller 

 than the eye-opening ; 28 to 32 scales 

 round the body 9. tenue, p. 231. 



Ear-opening a little larger than the eye- 

 opening ; 34 scales round the body . . 10. murrayi, p. 232. 



Ear-opening smaller than the eye-open- 

 ing ; snout much depressed 11. pallidum, p. 233. 



XX 0ii6 or more pairs of large transverse nuchals. 



22 scales round the body 12. minutum, p. 233. 



28 to 32 scales round the body ; dorsals 



equal, laterals a little smaller 13. isolejjis, p. 234. 



26 to 28 scales round the body; dorsals, 



especially the two vertebral series, 



largest 14. elegantulum, p. 235. 



ft Upper caudal scales obtusely keeled, the keels 

 forming continuous lines. 



32 to 34 scales round the body, all 



smooth 16. fasciolatum, p. 236. 



28 to 30 scales round the body ; dorsals 



obtusely unicarinate 17. monotropis, p. 237. 



** Prsefrontals in contact. 



Dorsal scales much larger than ventrals ; 

 prsefrontals, inner angles in contact ; 

 interparietal smaller than fronto- 

 parietals 20. rufum, p. 239. 



Dorsal scales much larger than ventrals ; 

 prtefrontals forming a median suture; 

 interparietal as large as fronto- 

 parietals 21. maindroni, p. 239. 



Dorsal and ventral scales subequal .... 22. consobrinum, p. 240. 



y. 36 to 38 scales round the body ; frontonasal forming 

 a suture with the frontal. 



Frontal in contact with the two anterior 



supraoculars, the first of which is at 



least twice as long as the second .... 23. jagorii, p. 240. 

 Frontal in contact with the three anterior 



supraoculars, the first of which is not 



much longer than the second 24. indicum, p. 241. 



