THE HOWLERS. 193 



Alouatta senicuhis, Lacep., Mem. de 1'Inst, iii., p. 489 (1800). 

 Stentor ursina (nee fig.), Humb. and Bonpl., Obs. Zool., v., 



P- 354(i8u). 

 ^Tycetes seniculus, Illig., Prod. Syst. Mamm., p. 70 (1811); 



Geoffr., Cat. Meth. Primates, p. 52 (1851); Schl., Mus. 



Pays Bas, vii., p. 156 (1876) ; Gray, Cat. Monkeys Brit. 



Mus., p. 39 (1870, part.). 



Stentor seniculns, Geoffr., Ann. Mus., xix., p. 108 (1812). 

 Mycetes stramineus, Spix, Sim. et Vespert., Bras., p. 45, pi. 31 



(1823; nee Geoffr.). 



Mycetes chrysurus, Geoffr., Mem. Mus., xvii., p. 66 (1829). 

 Mycetes auratus^ Gray, Ann. N. H., xvi., p. 220 (1845) > id. 



Cat. Monkeys Brit. Mus., p. 40 (1870). 

 Mycetes laniger, Gray, Ann. N. H., xvi, p. 219 (1845); id. 



Cat. Monkeys Brit. Mus., p. 40. 

 Aluatta senicula, Slack, Proc. Acad. Nat. Sci. Philad., 1862, 



P- 5i7. 



(Plate XVI II.) 



Characters. Head, neck, limbs and tail, dark chestnut- 

 brown ; back and sides golden-yellow ; beard in the full-grown 

 male long, the hair golden-yellow at the root, otherwise chest- 

 nut-brown ; face naked, black ; chest naked, the abdomen 

 sparsely covered with long brown hairs. 



The hair of the body is soft. The tail varies in colour in 

 individual specimens, being sometimes, at its termination, of 

 the same colour as the back, and sometimes bright golden- 

 yellow. The mammce are occasionally situated in the axilla 

 (or arm-pits). Length of body, 19}^ inches; tail, 20 inches. 



Yonnff. Of the same colour as the parents, only a little darker, 

 the hair hard and rigid. 



3 - v. i o 



