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Show 454 MR. G. A. BOULENGER ON THE [May 8, 63. DIPSADOMORPHUS BLANDINGII Hallow. Hab. West Africa, from the Senegal to the Congo ; Zanzibar. 64. DIPSADOBOA UNICOLOR Gthr. Hab. Sierra Leone to Gaboon. A single specimen (2 , V. 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 Lambarene, 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, specimen (total length 710 millim. ; 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 (Verh. zool.-bot. Ges. Wien, xlvii. 1897, p. 399), after examination of 8 specimens from Togoland, has arrived at the same conclusion. 65. PSAMMOPHIS SIBILANS L. Hab. Tropical Africa and Egypt. 66. THELOTORNIS KIRTLANDI Hallow. Hab. Tropical and South Africa. 67. MIODON COLLARIS Ptrs. Hab. Old Calabar to Angola. 68. MIODON GABONENSIS A. Dura. Hab. Old Calabar to Congo. 69. POLEMON BOCOURTI Mocq. Polemon bocourti, Mocquard, Bull. Soc Philom. (8) ix. 1897, p. 13. This species differs from P. barthi Jan in having two postoculars 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. |