'il O SEMNOPITHECUS FEMORALIS. 



merly by Horsfield, scilicet S. femoralis , but maintained 

 the specific distinction of S. chrysomelas. 



Anderson (Yunnan Expedition, 1878, p. 31) being ig- 

 norant of Schlegel's » Catalogue," as he nowhere quoted 

 it in his book , asserted : » as has been pointed out by pre- 

 vious authors, there do not appear to be any facts re- 

 flating to the structure of the so-called S. chrysomelas 

 »frora Borneo that would sanction its recognition as a 

 » species distinct from S. femoralis of Sumatra, and I have 

 » arrived at this opinion after an examination of the type 

 » specimens." 



Oldfield Thomas (P. Z. S. L. 1886, p. 66) seems to differ 

 from Anderson, for he states that »the few localities as 

 »yet recorded for S. femoralis Horsfield are all either in 

 »the South of the Malay Peninsula or in Sumatra." It is 

 clear that Oldfield Thomas keeps S. chrysomelas distinct 

 from S. femoralis, otherwise he would have added Borneo 

 to the above given localities. 



Blanford (The fauna of British India, 1888, Part I, p. 

 42) agrees, as it seems, more with Anderson, for he says 

 that S. femoralis is distributed over Borneo , Sumatra and 

 the Malay Peninsula, extending north into Tenasserim. 



Having now given an exposition as short as possible of 

 the stand of the question I will proceed to give my opinion 

 in a few words. I confess that it is very difficult to ob- 

 serve striking differences between S. femoralis and S. chry- 

 somelas as to their external appearance, but I think that 

 only a careful study of their skulls will settle the question. 

 In comparing adult skulls . of S. femoralis with the dra- 

 wings in the » Verhandelingen , plate 11, fig. 3," I am 

 unable to find difference whatsoever, but in comparing the 

 same bony parts of young specimens of the two species , 

 I suppose that there are to be observed very striking dif- 

 ferences. As I have no young skulls of S. chrysomelas to 

 compare with the young ones of S. femoralis in our col- 

 lection , I at present can only state that the peculiar form 

 of the frontalia and parietalia in our young skulls of & 



Notes from tlie Leyden Museum , Vol. XI. 



