new Species of Monkeys. 81 



length 44*3 ; length of upper molar series 35*8 ; length of 

 mandible 94*8; length of lower molar series 42*9. 



Type (adult) in British Museum, no. 3. 9. 1. 1. 



The peculiarity of this species is its general red colour, the 

 bright maroon of the head grading into the golden-red of the 

 body, without any marked line separating the hues. Its 

 general aspect is that of a red monkey, with limbs darker than 

 body. The basal portion of the tail is nearer the colour of 

 the thighs, the remaining part much lighter. 



Two specimens are in the British Museum collection, both 

 from the Rio Juara. 



Alouatta sara, sp. n. 



Type locality. Province of Sara, Bolivia. 



Gen. char. Colour of body uniform, limbs only slightly 

 darker, under parts yellowish, not orange-red as in the 

 Guiana species. Black band around face to beneath chin. 



Colour. Head very dark maroon j band across forehead, 

 down sides of head in front of ears, meeting beneath chin, 

 black ; upper parts of body and flanks, arms to elbows pale 

 golden-orange, darkest on dorsal Hue, base of hairs black ; 

 forearms, legs, hands, feet, and tail above orange-red; chin 

 red, paler than sides of head ; hairs on under parts nearly 

 gone, but are apparently yellowish with a red tinge ; hairs of 

 flanks along abdomen yellowish red, quite unlike the orange- 

 red of Guiana examples; underside of thighs yellowish red, 

 and tail beneath pale red. 



Measurements. Total length 1 120 mm. ; tail 590 ; foot 130 ; 

 ear 40 (collector). Skull : total length 110'4; occipito-nasal 

 length 92 ; intertemporal width 43 ; hensel 19*6; zygomatic 

 width 68*2 ; length of nasals 17*4; palatal length 35*5; 

 length of upper molar series 32 ; length of mandible 81*2 ; 

 length of lower molar series 38*2. 



Type in British Museum, no. 7. 8. 2. 1. 



This example from Bolivia is a female. It differs from' 

 others of the red Howlers, as typified by A. seniculus, in the 

 black band around the face, the uniform golden-orange colour 

 of the upper parts, and the yellowish or orange-red of the 

 hairs on the sides of the abdomen. 



Family Cercopithecidae. 

 Genus Cercopithecus. 

 Cercopithecus inobservatus, sp. n. 

 Type locality. West Africa (exact locality unknown), 

 Ann. & May. N. Hist. Ser. 8. Vol. v. 6 



