Species and Subspecies of Mammals. 193 



molar series 16 ; length of mandible 35 ; length of lower 

 molar series 16. 



B M. no. of type 4. 7. 7. 2. 



While allied to C. leucometopa^ the great difference in 

 colour the present species exiiibits makes it easily recog- 

 nizable. In its yellowish-grey fingers and toes it shows a 

 leaning towards C. ornatus, but in other respects it has no 

 resemblance to that species. 



Genus Lagothrix. 

 Lagothrix lugens, sp. n. 



Ti/pe, locality. Mountains 2° 20' north of Tolima, Colombia. 

 Altitude 5000 to 7000 feet. 



Gen. char. Body stout, heavy, as in L. lagotricha, but 

 colour very ditferent; fur thick, woolly; limbs moderately 

 long : tail very long and very broad at base. 



Colour. — Male. Head, arms, and body dark purplish 

 brown, almost black; legs and tail blackish brown washed 

 with grey, the hairs being blackisii brown at base, then black 

 and tipped with grey or yellowish; breast reddish chestnut, 

 rest of underparts black. 



Measurements. Size same as L. lagotricha. Skull : total 

 length 112 mm.; occiput broken; occipito-nasal length 105; 

 zygomatic wddth 74 ; intertemporal width 45 ; palatal 

 length 34 ; breadth of brain-case 57 ; length of brain-case 

 from end of nasals 79 ; length of nasals 13 ; width of nasals 

 anteriorly 13; length of upper molar series 24; length of 

 mandible 74 ; length of lower molar series 30"5. 



B.M. no. of type 90. 2. 22. 2. 



Two specimens are in the collection which differ so 

 markedly from all other members of the genus that it is 

 impossible to assign them to any described species. The fur 

 is soft and very thick, particularly so at the base of the tail. 

 One is dark purplish brown or blackish on the upperparts to 

 rump, and blackish to grey on legs and tail; the other is 

 darker. The skulls resemble, as may be expected, those of 

 Ij. lagotricha and L. «///(/ wiofws in general, but the nasals have 

 a depression in the middle and the anterior portion stands at 

 a right angle to the posterior and are very broad anteriorly ; 

 the brain-case is shorter than in the skulls of the other species 

 and the narial opening is of a different shape, like a heart 

 but not so pointed^ more rounded on the lower side. 



