ON THE SNAKES OF NORTH AFRICA. 299 



17. A List of the Snakes of North Africa. 

 By G. A. BouLENGER, 7.R.S., F.Z.S. 



[Received May 20, 1919 : Read June 17, 1919.] 

 i^Publislied bj- permission of tlie Trustees of the British Museum.) 



This list, dealing with the coiuparatively few species known 

 from North Africa (Section VII. of map on p. 269), concludes tlie 

 series T have prepared for the easy identification of the Snakes 

 of Africa*. 



Only four families are repi'esented in this area : — • 



Worm-like, covered with uniform scales above and beneath ; mouth 



small, inferior; e3'es rudimentary, under the head-shields Glauconiid.^. 



Mouth laro-e ; eyes exposed ; head covered with small scales ; 



ventral shields much narrower than the body BoiD^. 



Mouth large; eyes exposed; head with large shields; ventral 



shields broad Colubrid.t;. 



Mouth large ; eyes exposed ; head covered with small scales ; 



ventral shields broad ^'IPERIDJi;. 



Family G l A u c o N 1 1 D .«:. 

 A single genus. 



1. Glauconia. 



Gray, Oat. Liz. p. 139 ; Bouleng. Oat. Sn. i. p. 59. 



Two species : — 



Snout hooked, the preoral portion flat or concave inferiorlj'; 



diameter of body at least 100 times in total length G. macrorliynchus. 



Snout rounded ; diameter of body less than 100 times in total 



length G. cairi. 



1, Glauconia macrorhynchus. 



Stenostoma macrorhynchus Jan, Arch. Zool. Anat. Phys. i. 

 1862, p. 190. 



Glauconia inacrorhTjnclius Bouleng. Cat. )Sn. i. p. 61. 

 Glaioconia algeriensis Jacquet, Bibl. Anat. iv. 1896, p. 79, figs. 

 Algeria, Nubia, Mesopotamia, Persia. 



2. Glauconia cairi. 



Stenostoma cairi Dum. ct Bibr. Erp. Gen. vi. p. 323. 



Glauconia cairi Bouleng. Cat. Sn. i. p. 66. 



Egypt, Nubia, Ab3-ssinia, Somaliland, Mauritania. 



Family B o i D -E. 

 A single genus. 



1. Eryx. 



Daud. Hist. Rept. vii. p. 251 ; Bouleng. Cat. Sn. i. p. 122. 



* P. Z. S. 1915, pp. 193, 369, 611, 641, and 1919, p. 267.— According to my latest 

 ■estimate, the number of African species of Snakes amounts to 475. 



