258 Dr. D. G. Elliot on apparently new 



hue above burnt umber on head and upper parts, the hairs 

 being slate-grey and banded on apical half with tawny ochra- 

 ^ ceous and black ; narrow line over eyes blackish grey ; 

 numerous long stiff black hairs standing erect over fore- 

 head, producing an indistinct black line on each side ; 

 nose covered with short grizzled black and white hairs ; 

 sides of face huffy, sides of head from below ears and on 

 cheeks with long greyish hairs banded with white and pro- 

 jected forward, forming bushy whiskers ; outer sides of arms 

 and thighs iron-grey, hairs banded with cream-buff; legs 

 below knees iron-grey; under parts and inner side of limbs 

 greyish white; hands and feet iron-grey, speckled with 

 cream-buff like limbs ; tail above black, sparsely speckled 

 with white, beneath silver-grey. 



Female. Upper parts russet, speckled with cream-buff ; 

 arms and hands blackish, speckled with cream-buff ; thighs 

 like back, legs olive-grey ; feet and toes black, covered with 

 grey hairs ; tail like that of the male. 



Measurements. Total length 964 mm. ; tail 508; foot 11 7*5; 

 ear 29 (collector). Skull: total length 105'5 ; occipito- 

 nasal length 85"5 ; lieusel 73 5 ; zygomatic width 72 5 ; 

 intertemporal width 37"1 ; width of brain-case 5 4'9 ; length 

 of orbital ridge 45'4 ; greatest width of rostrum 385 ; length 

 of rostrum 38'5 ; length of nasals 24'4 ; palatal length 446 ; 

 length of upper tooth-row 26*7 ; length of mandible 80*8 ; 

 length of lower tooth-row 35. 



Type in British Museum, no. 9, 4. 1. 23. 



There is a great difference in the colouring of the sexes of 

 this species, the female being much lighter and redder, and 

 this difference is exhibited in very young males, which are 

 as dark as the adult males. This species appears also to 

 be a resident of Batam Island. Unfortunately only females 

 were procured there, but they closely resemble the females 

 from Bintang Island. Of course, adult males, when ob- 

 tained, may possess different cranial characters, and possibly 

 also coloration, for it seems to be the fact, so far as our 

 material enables a judgment to be formed, that the various 

 islands possess distinct forms ; but at present the examples 

 are not sufficient for a decision to be arrived at, and we must 

 regard the examples from the two islands as the same. 



Genus Cercopithecus. 

 Cercopithecus insolitus, sp. n. 

 Type locality. Northern Nigeria. 



Gen. char. Reddish brow-band ; upper parts black 

 speckled. 



