284 COLUBRID^. 



1. Opisthotropis atra. 



Opisthotropis ater, G'dnth. Ann. Sf May. N. H. (4) ix. 1872, p. 16, 

 pi. iii. fig, B. 



Snout short and broad, much depressed, not projecting. Rostral 

 much broader than deep, well visible from above ; internasals a 

 little longer than broad ; pnefroutal single ; frontal large, as broad 

 as long, thrice as broad as the supraocular, shorter than the 

 parietals ; loreal a little longer than deep ; one prae- and two 

 postoculars ; a very elongate anterior temporal ; eight upper 

 lal)ials, fifth entering the eye, seventh very long ; two pairs of sub- 

 ecjual chin-shields, anterior in contact with five labials. Scales in 17 

 rows, smooth on the nape, feebly keeled on the body, rather strongly 

 keeled towards the tail. Ventrals 170 ; anal divided ; subcaudals 

 65. Upper parts brownish black, lighter towards and on the 

 abdomen. 



Total length 340 miUim. ; tail 75. 



West Africa. 



a. S (V. 170 ; C. 65). W. Africa. (Type.) 



2. Opisthotropis andersonii. (Plate XYIII. fig. 3.) 



Calamohydrus andersonii, Bouleng. Ann. Sf Mag. N. H. (6) ii. 



1888, 13. 44. 

 Opisthotropis andersonii, Bouleng. Ann. Sf Mag. N. II. (6) vii. 



1891, p. 343. 



Snout short and broad, much depressed, not projecting. Rostral 

 much broader than deep, just visible from above ; internasals twice 

 as long as broad ; nasal cleft extending from the nostril to the 

 second labial ; a single prtefrontal ; frontal large, a little longer 

 than broad, much shorter than the parietals ; loreal much longer 

 than deep ; one prae- and one postocular ; two small suboculars, 

 separating the eye from the labials ; temporals 14-2; eight upper 

 labials, fifth below the eye ; only one pair of well-developed chin- 

 shields, in contact with four labials. Scales in 17 rows, finely striated 

 and feebly keeled. Ventrals 1(51 ; anal divided ; subcaudals 58. 

 Blackish olive above, each scale edged with whitish ; lower parts 

 whitish, chin and lower labials brown. 



Total length 240 millim. ; tail 45. 



Hong Kong. 



a. c? (V. 161 ; 0. 68). Hong Kong. Citv Hall Museum, Hong 



KongLE.]. (Type.) 



3. Opisthotropis rugosa. 



Le])idognathus rugosus, v. Lidth de Jeiide, in M. Weber, Zool. 



Ergeha. ii. p. 187, pi. xvi. tigs. 1-5 (189)). 

 Opisthotropis riigosa, Boiiknif. Ann. ^- Mac/. N. H. (6) vii. 1891, 



p. 343. 



