1,7. OPISTHOTEOPIS. 283^' 



vith small blact 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 680 millim. ; tail 160. 



Central America. 



a, b, c. 5 (V. 146, 149 ; 0. 63, 64) Panama. Zoological Society. 

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



3. Tretanorhinus mocquardii. 



Tretanorhinus mocquardi, Bocmirt, Le Natur. 1891, p. 122. 



A single prsefrontal ; a single loreal ; two prseooulars ; 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. OPISTHOTEOPIS. 



Opisthotropis, GiintJi. Ann. Sr Mag. N. S. (4) ix. 1872, p. 16; 



Bouleng. Ann. 8f Mag. N. H. (6) vii. 1891, p. 343. 

 Calamohydrus, Bouleng. Ann. %■ Mag. N. H.. (6) ii. 1888, p. 43. 

 Helicopsoides, Mocquard, Le Naturaliste, 1890, p. 154, and Nouv. 



Arch. Mm. (3) ii. 1890, p. 141, and Mem. Soc. Zool. Fr. v. 1892, 



p. 203. 

 Lepidognathua, v. Lidth de Jeiide, in M. Weber, Zool. Ergebn. 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 

 pupil ; nostrU directed upwards, in a divided or semidivided nasal. 

 Body cylindrical ; scales finely 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. 



Prififrontal single ; eight upper labials, fifth 



entering the eye 1. atra, p. 284. 



Praefrontal single ; eight upper labials, none 



entering the eye 2. andersonii, p. 284. 



Two prEefrontals ; twelve upper labials, none 



entering the eye 3. ruffosa, ^. 284. 



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



4. typica, p. 285. 



