132 Mr. W. L. Distant on new 



(inside w^) 16*5 ; post-palatal lengtli 40; length of maxillary 

 tooth-row 37. 



Hab. Rumruti, Laikipia Plateau. Altitude 6000 feet. 



Type. Adult male. Original number 1476. Collected on 

 November 4th, 1910. 



This Laikipia Dassie is distinguished from the Kenya 

 form by its far paler colour, both of the dorsal and ventral 

 surfaces. 



Mr. Kemp, while collecting on the Aberdare Mountains 

 in the early part of last year, obtained several specimens of 

 Dendrohyrax, and these appear to be quite similar to the 

 Laikipia series and may be regarded as representatives of the 

 same race. 



XV. — New Genera and Species of Cicadidse. 

 By W. L. Distant. 



Genus Rihana. 

 Rihana, Dist. Ann. & Mag. Nat. Hist. (7) xix. p. 426 (1904). 



Type, R. ochracea, Walk. 



Rihana numida, sp. n. 



Head and pronotum black ; head with a basal triangular 

 spot, an apical spot and the transverse lateral carinatious to 

 front, lateral margins, ocelli, and irregular spots between 

 ocelli and eyes on vertex, dull reddish ; pronotum black, much 

 suffused with dull reddish, basal and lateral margins ochra- 

 ceous, interiorly narrowly mai'gined with black ; mesouotum 

 black, the lateral margins, the margins of two central ob- 

 conical spots connected with anterior angles of basal cruci- 

 form elevation, which is of the same colour, dull reddish, 

 anterior angle of cruciform elevation annulated with black ; 

 mai'gins of mesonotum ochraceous ; abdomen above black, 

 a greyish spot on each side of second abdominal segment, 

 anal segment reddish ochraceous at base, with a central 

 black spot ; body beneath and legs ochraceous ; face and 

 abdomen more testaceous, the former with the interspaces 

 between the transverse carinations black ; sternum and 

 lateral abdominal margins somewhat longly palely pilose ; 

 tegmina and wings hyaline, the former on basal two-thirds 

 moderately tinted with ochraceous, the costal membrane and 



