12 XTPHIOPID^. 



C. Snout not hooked, with obtusely angular horizontal edge ; 

 nostrils inferior. 



1. Eye not distinguishable, 



a. 26 to 32 scales round the middle of the body ; diameter 

 of body 19 to 28 times in the total length. 



Nasal cleft proceeding from the first labial ; 



middle dorsal scales larger than the 



others 60. congicus, p. 40. 



Nasal cleft proceeding from the first labial ; 



three upper labials ....•■ 61. hallowellii, p. 40. 



N^asal cleft proceeding from the lower 



lateral border of the rostral 62. ancJiietce, p. 40. 



6. 24 scales round the middle of the body ; diameter of body 

 53 times in the total length. . 65. huehMlzi, p. 41. 



2. Eye distinguishable. 



a. Diameter of body 44 to 50 times in the total length ; 20 

 or 22 scales round the middle of the body. 



59. hoettgeri, p. 39. 



h. Diameter of body 21 to 36 times in the total length. 



Nasal completely divided into two ; 24 



scales round the middle of the body .... 63. mossamiicus, p. 41. 

 Nasal incompletely divided; 22 or 24 scales 



round the middle of the body ; ocular in 



contact with the second, third, and fourth 



labials 64. tettensis, p. 41. 



Nasal semidivided; 24 to 30 scales round 



the middle of the body ; praeocular not 



more than half as broad as the ocular . . 66. punctatus, p. 42. 

 Nasal semidivided ; 30 to 32 scales round 



the middle of the body; prseocular a 



little narrower than the ocular 67. hibronii, p. 44. 



D. Snout more or less distinctly hooked in profile, or with sharp 

 cutting horizontal edge ; nostrils inferior. 



1. 28 to 42 scales round the body ; snout not hooked. 



a. Nasal cleft extending from the first labial to the nostril. 



a. The portion of the rostral visible from below broader 

 than long. 



