17. OPISTHOXEOPIS. 285 



with small black spots ; a dark streak on each side of the head, 

 passing through the eye ; a yellow lateral streak, edged with dark 

 below, on the anterior portion of the body, posteriorly confluent 

 with the yellow of the ventral region ; yellow below, uniform or 

 with dark brown spots or dots. 



Total length (JSO millim. ; tail 100. 



Central America. 



a, b, c. 2 (V. 146, 149; C. 63, 64) Panama. Zoological Society, 



&yg.(V.134; C. 76). 



3. Tretanorhinus mocquardii. 



Tretanorbinus mocquardi, Bocourt, Le Natur. 1891, p. 122. 



A single pra^frontal ; a single loreal ; two prseoculars ; anterior 

 chin-shields in contact with each other anteriorly. Scales in 19 

 rows. A yellow stripe along the flanks ; lower parts fuliginous 

 yellow. 



Central America. 



17. OPISTHOTROPIS. 



Opisthotropis, Giiiith. Ami. 8f Maq. Is. H. (4) ix. 1872, p. 16; 



Boidewj. Ann. ^ May. N. H. (6) Vii. 1891, p. 343. 

 Calamohvdnis, Butdeng. Ann. 8)- Mac/. N. H. (6) ii. 1888, p. 43. 

 Helicopsoides, Mocqnard, Le Nnturaliste, 1890, p. 154, and Nouv. 



Arch. Mus. (3j ii. 1890, p. 141, a7id Mem. Soc. Zool. Fr. v. 1892, 



p. 203. 

 LepidogTiathus, v. Lidth de Jeude, in M. Weber, Zool. Erqehn. ii. 



•p. 186 (1890). 



Maxillary teeth small, equal, 20 to 25 ; mandibular teeth small, 

 equal. Head small, not distinct from neck ; eye small, with round 

 puj)il ; nostril directed upwards, in a divided or semidivided nasal. 

 Body cylindrical ; scales iinel)- striated and keeled, without apical 

 pits, in 17 or 19 rows; ventrals rounded. Tail moderate; sub- 

 caudals in two rows. Hypapophyses developed throughout the 

 vertebral column. 



West Africa ; Southern China ; Malay Archipelago. 



Synopsis of the Species. 



I. Scales in 17 rows ; nasals separated by the internasals. 



Pncfrontal single ; eight upper labials, fifth 



entering the eye 1. atra, p. 284. 



Piaefrontal single : eight upper labials, none 



entering the eye 2. andersonii, p. 284. 



Two prajf rentals ; twelve upper labials, none 



entering the eye o. rugosa, p. 284. 



II. Scales in 19 rows ; nasals in contact behind the rostral. 



4'. ti/pica, p. 285. 



