284 COLTJBSID^. 



1. Opisthotropis atra. 



Opistliotropis ater, Giinth. Ann. ^ Mag. N. H. (4) ix. 1872, p. 16, 

 pi. iii. iig. B. 



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

 muoh broader than deep, well visible from above ; intemasals a 

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

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

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

 postooulars ; a very elongate anterior temporal ; eight upper 

 labials, fifth entering the eye, seventh very long ; two pairs of sub- 

 equal 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; subcaud.ds 

 i65. Upper parts brownish black, lighter towards and on the 

 abdomen. 



Total length 340 millim. ; tail 75. 



West Africa. 



XI. d (V. 170 ; 0. 65). W. Africa. (Type.) 



2. Opistliotropis andersonii. (Plate XVIII. fig. 3.) 



Calamohydrus andersonii, Boulenc/. Ann. Sr Mag. N. H. (6) ii. 



1888, p. 44. 

 Opisthotropis andersonii, Bouleng. Ann. 8f Mag. N. H. (6) vii. 



1891, p. 343. 



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

 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 praefrontal ; 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 1 -f 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 161 ; 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 Eong. 



a. rj (V. 161 ; 0. 58). Hong Kong. City Hall Museum, Hong 



KoiigLE.]. (Type.) 



3. Opisthotropis rugosa. 



Lepidognathus rugosus, v. Lidth de Jeude, in M. Weber, Zool. 



Ergebn. ii. p. 187, pi. xvi. tigs. 1-5 (1890). 

 Opisthotropis rugosa, Bou,len(j. Ann. ^ Mag. N. H. (6) vii. 1891, 



p. 343. 



