346 MR. C. BODEN KLOSS ON 
conspicuous annulations on the upper parts and presented a 
striking contrast to the males (Review of the Primates II, p. 207). 
As the second of these females came from the extreme south-east 
of Siam, the range of indochinensis may be taken as covering the 
southern half of that country east of the Chao Phya river. 
The teeth of this race are somewhat variable; for instance 
small extra tubercles are developed on both sides of the upper 
molars of the female principally at the ends of the transverse 
channel between the main cusps, but they are only present on the 
inner sides of m2 and m* in the male. The latter has, however, a 
large cusp forming a marked heel in both posterior molars, espe- 
cially large in the lower, and this is entirely lacking in the female. 
Dimensions of the adult male:—Collector’s external mea- 
surements taken in the flesh: head and body, 525 (555)!; tail, 250 
(230); hind-foot, s.u., 179 (163). Skull:—Greatest length, 138 
(136): condylo-basal -length 108.5 (-); basal length, 97.5 (-); 
palatal length, 64 (—-); maxillary tooth-row including canine, 
alveoli, 46.5 (46.8); diameter of upper canine at alveolus 10 (10); 
diameter of last upper molar, 9.7 x 8.2? (9.6 x 9.0); front of orbit to 
gnathion, 52.8 (53.8); front of orbit to posterior point of skull, 
943 (89.7); greatest breadth of muzzle above the canines, 31 (— ); 
greatest breadth of rostrum above m3, 43 (—); zygomatic breadth 
95.2 (94); breadth of braincase above roots of zygomata, 67.2. (64.4); 
depth of braincase between extremity of frontal and lower edge of 
condyle, 58.3 (59); length of mandible, 98 (100); mandibular tooth 
row including canine, alveoli, 51 (53). 
5. Macaca irus. 
Macacus irus, F. Guv. Mem. Mus. Hist. Nat, Paris, IV, p. 120, 
(1818). 
Macaca irus, Kloss, P.Z.8. 1916, p, 31, 
1d juv., 19% juv. Lat Bua Kao, 
Two. dull-ccloured animals with radiating crests. 
1 Measurements in parentheses those of the type of J/. », adusta from 
Champang, 8. Tenasserim, U. 8S. N. M. No, 124023, 
2 Crowns. 
3 to posterior point of braincase. 
JOURN, NAT. HIST. SOC, S1AM. 
