• Mrs. M. K. Thomas 07i new Species q/' Mylabrlnge. 501 



as a special genus, for which the name of Chilomys maj be 

 suggested. 



No member of Oryzomys shows any tendency towards its 

 peculiar cranial and dental characteristics, already described, 

 and it seems therefore best to form a special genus for its 

 reception. 



LI. — Descriptions of Five new <Spec/es o/Mylabrinse (Lyttidse) 

 in the Collection of the British Museum. By Mrs. M. K. 

 Thomas. 



Lydoceras bilineatuSj sp. n. 



Black, glabrous, shining, clothed on the underside with 

 rather fine black hairs ; the head, prothorax, and elytra are 

 thickly and coarsely punctured. The elytra are black, each 

 having two narrow transverse yellow bands bordered with 

 red, of which the first across the middle of the elytron is 

 margined posteriorly with red, and the second between the 

 middle and the apex is margined anteriorly with red. 



Antennce black, short, and rather thick, and the legs also 

 black, the femora clothed with very short yellow pubescence, 

 and the tibise and tarsi with long black hairs ; the claws are 

 red. 



This fine species differs from Lydoceras fasciata, the only 

 previously known species of the genus, in the head and pro- 

 thorax being more rugose, in having no red spots on the 

 prothorax, in the antennae being shorter, thicker, and more 

 serrated, and in general form being longer and narrower. 



Length 40, breadth 12 millim. 



IJab. Athi Plains, British East Africa. 



Collected and presented by Dr. J. W. Gregory. 



Ceroctis vespina, sp. n. 



Black, glabrous, sparsely clothed with longish black hairs; 

 the head, prothorax, and elytra closely and somewhat coarsely 

 punctured. Elytra bright yellow, with three transverse 

 black sinuated bands on each elytron — the first one, between 

 the base and middle, is narrower than the other two, and is 

 composed of two spots either separated or joined into one 

 band, which does not reach either the suture or the outer 

 margin ; the second, at the middle, is slightly broader, and 

 touches the sutural and outer margins, as does also the third, 



