47. siMocEPHALrrs. 347 



a. J (V. 252; C.?). Pernando Po. Niger Expedition. 



h, c. ? (V. 248, 251 ; Fernando Po. Sir A. Smith [P.]. 

 C.96, 93). 



d. 5 (V. 256 ; C. 93). Cameroons. Liverpool Museum. 



e. 2 (V. 242 ; C. 88). Cameroons. Dr. J. G. Fischer. 



f. $ (V. 253; C.94). Eloby district. 



g. S (V. 253 ; 0. 85). Old Calabar. W. Logan, Esq. 



[P.J. 

 h. $ (V. 247 ; C. ?). Sierra Leone. H. 0. Hart, Esq. 



[P.]. 

 i. Yg. (V. 251 ; C. 124). W. Africa. J. 0. Salmon, Esq. 



A, I. Yg. (V. 253, 250; W. Africa. 



C. 92, 104). 



[P.]. 



4. Simocephalus nyassas. (Plate XXIII. fig. 2.) 



Simocephalus nyassse, Giinth. Ann. ^ Mag. N. H. (6) i. 1888, 

 p. 828. 



Eosfcral miicli broader than deep, just visible from above ; inter- 

 nasals broader than long, half the length of the praefrontals ; frontal 

 a little longer than broad, as long as its distance from the rostral, 

 much shorter than the parietals ; loreal longer than deep ; one 

 prae- and one postooular ; temporals 1 + 2 ; seven upper labials, 

 third and fourth entering the ej-e, fifth sometimes touching the 

 parietals ; five lower labials in contact -with the anterior chin- 

 shields, -which are longer than the posterior. Scales strongly- 

 keeled, -with secondary keels and tubercles, in 15 rows (17 on 

 the neck). Ventrals 171-178; anal entire; subcaudals 62-63. 

 Blackish brown above, paler brown below, the chin and the lateral 

 ventral keel yellowish. 



Total length 460 millim. ; tail 100. 



Lake Nyassa ; Zanzibar. 



a. Hgr. (V. 178 ; 0. 63). L. Nyassa. (Type.) 



b. Yg. (V. 171 ; C. 62). Zanzibar. Sir J. Kirk [C.]. 



5. Simocephalus stenophthalmus. 



Heterolepia stenophthalmus, Mocquard, Bull. Soc. Philom. (7) xi. 

 1887, p. 16, pi. i. fig. 1. 



Differs from S. poensis in the smaller eye, which is scarcely 

 larger than the nostril, the presence of a single postocular, the le?s 

 strongly keeled scales, and the number of ventrals (206-214) and 

 subcaudals (59). Uniform dark purplish brown above ; belly 

 yellowish, with a purplish-brown spot on the outer end of each 

 ventral ; subcaudals brown with whitish posterior edge. 



Total length 590 millim.; tail 110. 



Coast of Guinea. 



