140 COIUBKID^. 



Agrees in structural characters witli T. rhombeatus except in 

 having a smaller eye, the diameter of which is less than its distance 

 from the nostril. The rostral shield, which is as deep as broad, is 

 wedged in between the nasals, but does not separate them behind ; 

 its upper portion measuring at least half its distance from the 

 frontal. Ventrals 149-170 ; subcaudals 53-66. Greyish or pale 

 brown above, with two or three dark brown, black-edged bands 

 originating on the head and extending to the end of the tail, the 

 outer passing through the eye, the vertebral sometimes rather 

 indistinct or absent ; a fine yellowish line sometimes divides the 

 vertebral band ; the sides below the bands white, with a pale 

 brown or red streak running along the outer row of scales ; upper 

 lip and lower parts white. 



Total length 740 millim. ; tail 150. 



Tropical Africa south of the Equator ; East Africa. 



a. fj (V. 160 ; C. 60). S.E. Africa. (Type.) 



5. Yg. (V. 163 ; 0. 58). Waterberg District, Trans- W. L. Distant, Esq. 

 vaal. [P.]. 



c. c? (V. 152 ; C. 60). Pietersburg, Transvaal. C.H.Jones, Esq. [P.]. 



d. $ (V. 162 ; 0. 58). Matabeleland. E. Gates, Esq. [P.]. 



(Type of Coronella triiisnia.) 



e-ff- d (y. 160 ; Ilalamabeeli, Kalahari R. J. Cuninghame, 



0. 65) & $ (V. 162, Desert. Esq. [P.J. 



153 ; 0. 56, 63). 



A-i. d (V. 156, 149 ; Zomba, Brit. Central Sir H. H. Johnston 



C. 61, 57). Africa. [P.]. 



Ji^l. 2 (V. 162, 150 ; Chiradziilu, Brit. Central Sir H. H. Johnston 



C. 55, 54). Africa. [P.]. 



m. Hgr. (V. 149 ; Fwambo, Brit. Central A. Carson, Esq. [0,1. 



C. 55). Africa. 



n-o. 2 (V. 165 Mpwapwa, E. Central 



166 ; C. 66, ?). Africa. 



p. Hgr. (V. 170 ; Kibibi Basin, E. Africa. Dr. J. W. Gregory 



C. 63). [P.]. 

 g. Skull of 0. 



3. Trimerorhinus variabilis. 



Psammophylax variabilis, Gunth. Proc. Zool. Soc. 1892, p. 667, 



pi. XXXV. 



Agrees with T. tritaeniatus, but rostral shield slightly broader 

 than deep, its upper portion measuring about one third its distance 

 from the frontal. Ventrals 157-169; subcaudals 52-60. Pale 

 olive to blackish above, uniform or with three dark, black-edged 

 longitudinal bands and a fine yellowish vertebral line ; beUy olive- 

 to lead-grey. 



Total length 770 millim. ; tail 130. 



Nyassaland. 



a-d. S (V. 157 ; C. 55) Shir^ highlands. Sir H. H. Johnston 



& S (V. 169, 162, [P.]. (Types.) 



163; C. 57, ?, 60). 



e. $ (V. 162 ; C. 52). Zomba, Brit. Central Sir H. H. Johnston, 



Africa. [P.]. 



