92 Mr. G. A. Boulenger on a neio SnaJce. 



The African species of Gluuconia which, in my opinion, 

 arc entitled to recof^nition are thirteen in number, and may be 

 distinguished as follows : — 



A. Ocular bordfringr the lip, separated from the 



lower part of the nasal by a single labial. 



a. Snout hooked, the prseoral portion flat or 

 concave inferiorly. 



Diameter of body more than 100 times in the 



total length G. mrtcrorhi/nchus, Jan. 



Diameter of body less than 100 times in the 



total length G. rostrata, Bocage. 



h. Snout rounded, 



a' . Supraocular nearly twice as broad as 

 long, followed by a single transversely 

 enlarged shield G. Emini, Blgr. 



h'. Supi-aocular small. 



a". Rostral not extending to the level of 

 the posterior border of the eyes. 



a. Diameter of body 40 to 57 times in 

 the total length. 



First labial as large as lower part of nasal .... G. 7iarirostn'<>, Ptrs. 

 First labial smaller than lower part of nasal ; 



length of tail 25 to 30 times in total G. brevicauda, Bocage. 



First labial smaller than lower part of nasal ; 



length of tail 8 to 13 times iu total G. tiiyricans, Schleg. 



/3. Diameter of body G5 to 90 times in 

 the total length. 



Nasal semidivided ; length of tail 14 or 15 times 



in total G. Cain, D. .^' B. 



Nasal completely divided ; length of tail 9 times 



in total G. loncjicauda, Ptrs. 



h". Rostral extending to the level of the 

 posterior boi'der of the eyes. 



Rostral not twice the width of the nasal G. cotijnncfa, Jan. 



Rostral at least twice the width of the nasal . . G. sciitifruiu^, Ptrs. 



B. Ocular bordering the lip, separated from the 



lower part of the ro.stral by two labials. 



Supraocular large, as broad as the shield 



following G. Sundevallii, Jan. 



Supraocular small G. bicolor, Jan. 



C. Ocular not reaching the lip G. dissimili/t, JiocHge. 



In addition to the above-described Glauconici, the following 



