14 I)KSCRIPTI\'K ACCOITN'T OF 



Mr. Thomas in his paper on this species makes the 

 following remarks. 



"In i88q I had the pleasure of describing before this 

 " Society a very beautiful species of Scmiiopit/icciis from the 

 " Baram district, North-eastern Sarawak, which was discovered 

 " by Mr. Charles Hose, and was named in his honour 

 " Scmnopithcciis hosci. Of this monkey many specimens, all 

 *' from much the same district, have come to Europe, and I 

 " have reason to believe that most of the European museums 

 " have now been presented with examples of it, all obtained 

 " by the same energetic and successful collector. In our own 

 " museum we have, besides th:; type, another adult male, two 

 " young specimens, and an adult skeleton. All these 

 " specimens, including young ones barely a foot in length, 

 " have shown the most striking uniformity in their coloration, 

 " there being in none of them the smallest deviation from the 

 " colour depicted in my illustration of the type (t.c. plate xvi.) 



" Now, however, the museum has received, first from 

 " Mr. A. Everett, who noticed the differences himself, one 

 " specimen, and then from Mr. Hose two more, of a monkey 

 " undoubtedly closely allied to »S. hosci\ but yet all three so 

 " like each other, and so different in markings from any 

 " specimen of that species which I have seen, that I feel 

 " unable to consider it to be S. hosci\ and therefore must 

 " describe it as new. 



" The chief difference lies in the distribution of the 

 " colours of the head, for while in S. hosci only the centre of 

 " the crown, and a narrow line down the nape and back, the 

 " rest, including the whole of the region round and above the 

 " ear, being pure white, in ,S'. cvcrctii the whole of the 

 " forehead and top of the head are black, the lower limit of 

 " the.black pa.ssing across the middle of the ear, and the whole 

 " breadth of the back of the neck is also black. A spot in the 

 " exact centre of the forehead, just above the meeting of the 

 " eyebrt)ws is, however, pale yellowish white. The pale 

 cheeks and the pale sides of the neck are in this species in 

 just as striking contrast to the dark crown as in .S'. h<)sci\ and 

 " distinguish it equally from its near ally S. chrvsomclas 

 ( femora lis ). 



Mr. Thomas also says, " I must of course admit the 

 " possibility of intermediate specimens between S. hosci and 

 " S. cvci'ctti occurring, and the consequent necessity for the 

 " reduction of the latter form to the rank of a sub-species ; but 

 " in the absence of such intermediate forms, and in view of 

 " the great constancy in the coloration of iS. hosci already 

 " noted, it seems best to give a name to the striking variation 

 " from it now described." 



"c 



