S7iakes of Tropical Africa. 325 



is the same as in the first, but of the black cross bands only 

 the two anterior are indistinctly visible ; lower parts uniform 

 whitish. Ventral scutes 155; subcaudals 51. — Lake Tan- 

 ganyika. 



TJriecMs concolor^ Fischer. 



A specimen from Lado, sent by Erain Pasha, agrees per- 

 fectly with the description given by Fischer. Besides the 

 black coloration, the length of the suture formed by the first 

 lower labials behind the raentale is characteristic. Ventral 

 scutes 148 ; subcaudals 54. Fischer's specimen came from 

 the foot of Kiliraa-ndjaro. 



Uriechis Jachsonii, sp. n. (PL XIX. fig. E.) 



This species also is very closely allied to Uriechis caj^ensis. 

 Scales in fifteen rows. Ventral scutes 150 ; subcaudals 39. 

 Head rather narrow, depressed. Prasocular short, two post- 

 oculars. Temporals 1+2, the anterior in contact with the 

 postoculars ; seven upper labials, of which the third and 

 fourth enter the orbit, and none of which are in contact with 

 the occipitals. Mentale short, the lower labials of the first 

 pair forming a suture together in the median line. Light 

 olive-coloured, the upper part of the head and of the neck and 

 also the labials below the eye black ; a pair of white spots 

 behind the occiput. A narrow black line runs along the 

 vertebral series of scales. Lower parts uniform whitish. 



A single young specimen, 7^ inches long, was discovered 

 by F. J. Jackson, Esq., at the foot of Kilima-ndjaro. 



The figure of the head is twice the natural size. 



't>' 



Grayia triangularis^ Hall. 



A young specimen from the Congo has the whole of the 

 lower parts uniform black. Another young specimen from 

 the Gaboon differs still more from the type in its coloration, 

 the light cross bands being absent, appearing as irregular 

 whitish longitudinal lines on the side of the body. The 

 upper parts are nearly uniform greyish brown, each scale 

 having a darker centre. Lower parts black. 



Ahcetulla Emini, sp. n. 



Ventral shields without keels, 151 ; anal bifid ; upper 

 labials nine, the fourth, fifth, and sixth entering the orbit ; one 

 anteocular, two postoculars ; six of the lower labials are in 



