72 



Mr. K. Andersen on 



described, in external characters as avcII as in skull and 

 dentition. Its geographical distribution therefore, probably, 

 is from Angola across South Africa, eastwards at least to 

 Mazoc. 



Remarks. — The short diagnosis given above will, in every 

 case, prevent confusion of the present species with any other 

 hitherto known South-African Rhino/op/ms. Rh. Landeri, 

 lohatns, shhuhttor, and Dcnti dificrj altogether, in having the 

 upper 2'' l)laced in the tooth-row, separating the canine and 

 p'^ by a distinctly perceptible interspace. Rh. Landeri is 

 much smaller (forearm about 43 mm.), with much shorter 

 ears, much narrower sella, higher connecting-process, much 

 shorter tail (18-21 mm.), and with the 1st phalanx of the 

 4th finger ])eculiarly shortened (less than, or equal to, half 

 the length of the 2nd phalanx). Rh. lubutus, which is 

 of about the same size as Rh. Darlinyi, may at once bo 

 separated by having the posterior connecting-process long, 

 pointed, projecting like a small ''horn" far beyond the 

 summit of the sella, Rh. simulator is smaller (forearm 

 43*5-45 mm.) ; the front face of the sella is " rough," owing 

 to the presence of very short hairs (most easily to be 

 observed under a lens). Rh. Deiiti is much smaller (forearm 

 41-43 mm.) ; front face of sella as in Rh. siinnlator. 



The species is named in honour of Mr. J. ffolliott Darling, 

 to whom the British Museum is indebted for so many 

 valuable accessions to its collection of South-African 

 mammals. 



Measurements. 



Forearm 



3rd metacarpal 



4th metacarpal 



5tli meta(!arpal 



Tail, from anus 



Skull, extreme length 



„ zygomatic width 



Mandible, condylus to front of incisors. 



Front of upper canine to back of m^ . . . 



„ lower canine to back of ;«, . . . 



