SNA.KES OF WEST AFRICA. 293 



3. Aparallactus nigrocollaris Obaban. Bull. Mus. Paris, 

 1916, p. 377, fig. 



French Congo. 



4. Aparallactus roucheti. 



AparsiUaciics nigrocollaris, var. roucheti Chaban. t. c. p. 378, fig. 

 French Congo. 



5. Aparallactus lineatus. 



(Jriechis lineatus Peters, Mon. Berl. Ac. 1870, p. 643, pi. i. fig. 3. 

 Aparallactus lineattis Bouleng. Cat. Sn. iii. p. 261. 

 Keta, Guinea. 



6. Aparallactus anomalus. 



Uriealiis anomala Bouleng. Ann. & Mag. N. H. (6) xii. 1893, 

 p. 273. 



A2:>arallactus anomcdus Bouleng. Cat. Stl. iii. p. 262, pi. xi. fig. 3. 

 Gold Coast. 



7. Aparallactus nicer Bouleng. Ann. cfe Mag. IST. H. (6) xix. 

 1897, p. 154. 



Roideophis chevalieri Chaban. Bull. Mus. Paris, 1916, p. 379, fig. 

 Sieri'a Leone, French Guinea. 



18. Elapops. 



Giinth. Ann. & Mag. N. H. (3) iv. 1859, p. 161; Bouleng. 

 •Cat. Sn. iii. p. 262. 



1. Elapops modestus Giinth. 1. c. ; Bouleng. I.e. 

 Aparallactus houlengeri Werner, Verb, zool.-bot. Ges. Wieii, 

 xlvi. 1896, p. 363. 



Aparallactus p)e7-affinis Werner, op. cit. xlvii. 1897, p. 404. 

 Liberia to Congo, eastwards to the Ituri. 



C. Proteroglypha. 

 (Loreal absent in all the genera.) 



I. Head sliort ; subcaudals less tlian 95. 



■Scales not at all oblique ; ventrals 192-230; subcandals 67-80 Bnulengerina. 



Scales more or less oblique ; ventrals 141-172; subcaudals 13-36... JSlapechis. 



■Scales oblique ; ventrals 189-228 ; subcaudals 50-92 Naia. 



II. Head long, narrow, snout not broader tban long ; scales verj^ 



oblique; ventrals 202-279 ; subcaudals 97-121 Dendras;pis. 



1. BOULENGERIXA. 



Dollo, Bull. Mus. Belg. iv. 1886, p. 159 ; Bouleng, Cat. Sn. iii. 

 p. 357. 



Two species : — 



Rostral nearly as deep as broad ; temporals 1 + 2 ; 3 upper labials in 



contact with lower subocular B. annulata. 



iiostral much broader than deep; temporals 2 + 2 or 2 + 3; 2 upper 



labials in contact with lower subocular B. dyhowsiii. 



21* 



