MAMMALS FROM ST AM, 31 



above, this colour not continued on to the rump, which is 

 scarcely perceptibly darkened mesially. Inner side of ears 

 silvery, a few dark hairs round the eyes. Skin of orbital region 

 in living animal pale lilac-blue ; nose, lips, palms, and soles 

 fleshy brown. 



Comparison with females of 31. nemestrina fi'om the Malay 

 Peninsula shows that the female andamanensis differs in the 

 absence of any rufous or ochraceous tone in the pelage and in 

 its undarkened rump : while, as regards the skull, the muzzle is 

 much reduced in size and tapers both upwards and forwards and 

 the interpterygoid space is wider, embracing laterally a greater 

 portion of the bullae. 



Considering the individual variability of macaques, the 

 dimensions of the skull are in strikingly close agreement with 

 those of the female recorded by Anderson in ' Zoological Re- 

 searches,' p. 52, which probably came from the country west of 

 the Irawadi River. 



Measurements. — External measurements, taken in the flesh : 

 total length, 640 mm. ; tail from angle formed with rump above, 

 ■200 ; head to vent, 480 ; hind foot, 158 ; ear, 38. Skull : greatest 

 length, 117-5 (113-8) ; basal length, 77-7 (79-2) ; palate to foramen 

 magnum, 32 (34-5) ; anterior edge of auditory opening to 

 gnathion, 86-2 (81-2); occiput to narion, 85 (87-6); narion to 

 gnathion, 49-3 (51*7) ; orbit to gnathion, 39; breadth of muzzle 

 at pm^ 30-5 (30-4), at m^ 35-6 (34-3), at roots of zygomata 40; 

 facial breadth at fronto-malar suture, 61 (62) ; post-orbital 

 breadth, 47*6 (48-2) ; zygomatic breadth, 77 (76) ; mastoid breadth, 

 64 (62-7); orbit, 25x25-5 (24x28); maxillary tooth-row ex- 

 clusive of incisors, 38 ; length of mandible in alveolar plane, 

 77 (75). 



Elliot has pointed out (' Review of the Primates,' vol. ii. 

 p. 209) that Bly til's name for this monkey is preoccupied by 

 leonina Sliaw, applied to AI. albibarbatus, so that andamanensis 

 Bartlett, based on an example introduced into the Andamans 

 from Burma, must unfortunately be used, 



3. Macaca irus Cuvier. 



Macacus irus F. Cuv. Mem. Mus. Hist. Nat. Paris, iv. 1818, 

 p. 120. 



Macacas cynomolgus Flower, P. Z. S. 1900, p. 316 ; de Pou- 

 sargues. Mission Pavie, Indo-Chine, Etudes Diverses, iii. p. 517 

 (1904). 



Pithecus fascictdai'is Gyldenstolpe, Arkiv for Zoologi, Band 8, 

 No. 23, p. 3 (1914). 



3 adult males, 2 adult females, 1 immature female, from Koh 

 Kut Id., S.E. Siam. 



3 immature females, from Koh Chang Id., S.E. Siam. 



I have compared these animals with a large number from 

 the Malay Peninsula and adjacent islands which show a great 



