On a new Tree-Viper from M<i)tnt Ruioenzori. 'M 



rouiuled, \ length of head ; mouth small, subiiit'erior, its wiiltli 

 |- Icngtii of head; a very distinct mental swelling; teeth 

 small, notched, 5 or () in the upper jaw, 6 in the lower; 

 nostrils midway between eye and end of snout, the anterior 

 on a U'vel witli the centre of the former, the posterior on a 

 level with its lower border; eye small, r length of snout, }^ 

 iiiterocular width. Dorsal 16-17, originating above fifth ray 

 of anal, its length about ^ of its distance from the head. 

 Anal 22-23, a little nearer root of caudal than base of ventral. 

 Pectoral pointed, about | length of head, once and ^ length 

 of ventral, not reaching base of latter. Caudal with pointed 

 lobes. Caudal peduncle 2^- or 2§ times as long as deep, a 

 little shorter than head. 08-70 scales in the lateral line, y. 

 in a transverse series on the body, y^ in a transverse series 

 between dorsal and anal, 16 round caudal peduncle. Uniform 

 brown, somewhat lighter beneath. 



Total length 145 mm. 



Two specimens from the Kribi River, Efulen, South 

 Cameroon, from Mr. G. L. Bates's collections. 



Most nearly allied to M. sphecodes^ Sauv., and M. brachis- 

 ti'us, Gill. Distinguished from both by the number of scales 

 round the caudal peduncle, which is less slender. This now 

 species may be regarded as intermediate between M. brachis- 

 tius and M. paiiciradiatus, Stdr. 



VIII. — Description of a new Tree-Viper from Mount 

 Ruwenzori. By G. A. BoI^jlenger, F.R.S. 



Aikeris Woosnami. 



Snout truncate at the end, with sharp catithus. Eye 

 rather small. Rostral twice and a half to three times as 

 broad as deep ; head-shields sharply keeled, 8 to 10 across 

 the crown from eye to eye; 12 to 15 scales round the eye; 

 one or two series of scales between the eye and the labials ; 

 nasal entire or divided; 10 upper labials ; three or four pairs 

 of small chin-shields, anterior largest and in contact with 

 three or four lower labials ; gular scales smooth or very 

 faintly keeled. Scales strongly keeled, in 25 to 30 rows. 

 Ventrals 151 in males, 158-162 in females; anal entire; 

 subcaudals 49-52 in males, 44-17 in females. Olive-green 

 to bright grass-green above, usually with a dorsal series of 



