454 MR. G. A. BOULEXGER OX THE [May 8, 



63. Dipsadomobphus blaxdixgii Hallow. 



Hab. West Africa, from the Senegal to the Congo : Zanzibar. 



64. Dipsadoboa uxicolob Gthr. 



Hab. Sierra Leone to Gaboon. 



A single specimen ( $ , Y. 192; C. 58) was sent by Mr. Bates 

 from the Benito Biver. It is blackish above and white beneath, 

 Eight upper labials, third and fourth entering the eye. A smaller 

 specimen, collected by Miss Kingsley at Lainbarene, noticed by 

 Giinther under the name of D. assimilis Matschie, is brown above 

 with ill-defined darker cross-bars ; eight upper labials, fourth and 

 fifth entering the eye on the left side, third, fourth, and fifth on the 

 left. The typical D. unicolor Gthr., green above, with nine upper 

 labials, fifth and sixth entering the eye, is not confined to the 

 island of Fernando Po, as Giinther was inclined to believe ; the 

 British Museum has recently acquired a similar, but larger, speci- 

 men (total length 710 milliin. ; tail 145) from Sierra Leone. 

 Anoplodipsas viridis Ptrs., of which Heterurus bicolor Jan is a 

 strict synonym, is green above and has eight upper labials, fourth 

 and fifth entering the eye. There is thus no correspondence 

 between the colour and the number of the labials. I therefore 

 do not think D. assimilis can be separated, as a species, from 

 D. unicolor, however much extreme forms may differ. F. Werner 

 (Verb, zool.-bot. Ges. Wien, xlvii. 1897, p. 399), after examination 

 of 8 specimens from Togoland, has arrived at the same conclusion. 



65. PSAMHOPHIS SIBILAXS L. 



Hab. Tropical Africa and Egypt. 



66. Thelotorxis kirtlaxdi Hallow. 

 Hub. Tropical and South Africa. 



67. Miodox collaeis Ptrs. 

 Hab. Old Calabar to Angola. 



68. MiODOX GABOXEXSJS A. Dum. 



Hab. Old Calabar to Congo. 



69. Polemox bocoueti Mocq. 



Polemon bocourti, Mocquard, Bull. Soc. Philom. (8) ix. 1897, 

 p. 13. 



This species differs from P. bartM Jan in having two post- 

 oculars and a lower number of ventral shields (178-202). A 

 single specimen from Lambarene (V. 171 ; C. 24) in Miss Kingsley's 

 collection has been referred by Giinther to P. barthi. 



70. Elapops modestus Gthr. 

 Hab. Liberia to Congo. 



