76 SIMIID^. 



of many living Macaques from various parts of Burma and the Malayan peninsula 

 does not support the line of distinction that Cuvier has drawn between the Macaque 

 a face noire and the Macaque a face tannee, for among these there are faces so 

 coloured as to lead from the one of these extremes into the other. 



Cuvier also states that the head of M. cynomolgus has neither tuft nor crest, 

 and that the hair of the summit lies uniformly backwards, which are also the 

 features of M. carhonarius as represented by him. But both livid and dusky-faced 

 Macaques may not unfrequently be observed in which the hair on the vertex has a 

 distinct tendency to assume an erect character, and others in which it shows an 

 inclination to radiate from a centre. One example has come under my notice in 

 which there were two such areas of radiation, one on each side of the centre of the 

 mesial line, gathering, as it were, the hair between them, and directing it upwards and 

 forwards in a kind of crest. The cresting of the head thus appears to be a variable 

 feature. 



Specimens have been observed intermediate between M. carhonarius and M. 

 aureus, differing only in inconsiderable modifications of colour ; some have associated 

 with the dark face of M. carhonarius the rufous colour of M. aureus. Those monkeys 

 which are referable to M. carhonarius appear to be more distinctive of the Nicobars, 

 Sumatra, the neighbouring islands, and the Malayan peninsula, than of Burma, in 

 which the more typical form of M. cynomolgus prevails, and of which the foregoing 

 male described by me is a characteristic example. 



The monkeys referable to M. aureus which are found in the Calcutta market 

 are brought, as a rule, from Singapore, but we do not possess any exact informa- 

 tion regarding the habitat of this race. The type of M. aureus described by 

 M. Is. Geoff. St.-Hilaire as a native of Bengal was in all probability a market 

 specimen, as no monkey resembling M. cynomolgus is indigenous to Bengal. 



A race nearly allied to that of M. aureus has lately been described by 

 Dr. Gray from Borneo under the name of M. cristatus. The fur, in its light yellow 

 colour, approaches the albino race from the Philippines, which has also occasionally 

 a central top-knot, to which Is. Geoff. St. Hil. attached considerable importance. 

 In the Negris Islands, the Macaque has likewise the hair on the vertex somewhat 

 erect, with pale temples, the fur generally being rather rich brownish olive, and the 

 tail blackish brown. This race approaches M. carhonarius. Another race of the 

 widely-distributed species is found in Timor and in the Celebes. 



The Siamese race of this species, which was erroneously regarded by Dr. Gray 

 as Jf. assamensis, M'Clelland, is rather paler and with less orange in the annulations 

 of the fur than is generally the case in its Burmese and Malayan representatives, 

 and in its general colour it is resembled by examples from the Island of Elores. 



The Macaque, M. fur. Slack, which has been described from the Island of Luzon, 

 to which locality the late M. Jules Yerraux informed Mr. Slack that it was 

 confined, is so doubtfully distinct from M. cynomolgus that I have included it as a 

 synonym. 



