LAGOTHRIX 57 



Pelz., Zool.-Bot. Ges. Wien, 1883, Beiheft, p. 7 ; Schleg., Mus. 



Pays-Bas, Simiae, 1876, p. 162, (Part.). 

 Cebus lagothrix Fisch., Syn. Mamm., 1829, p. 41. 

 Lagothrix caparro Less., Spec. Mamm., 1840 p. 125. 

 Lagothrix tschudi Pucher., Rev. Mag. Zool., 1857, p. 296. 

 Lagothrix olivacea Bates, Nat. Riv. Amaz., II, 1863, p. 320, (nee 



Spix). 

 Lagothrix lagothrix Forbes, Handb. Primates, I, 1894, p. 222, pi. 



XX. 



HUMBOLOrS WOOLLY MONKEY. 



Type locality. Banks of the Guaviare, a branch of the Upper 

 Orinoco River, Brazil. 



Geogr. Distr. River Guaviare and the Upper Amazonian region 

 in the district lying south-west of the Rio Negro, and in the Upper 

 Magdalena Valley, Colombia. Chanchamayo, Peru (Kalinowski). 

 Specimen in British Museum Collection. 



Color. Head to nape black; hands and feet and under parts of 

 body black; upper parts, limbs and tail blackish hoary gray; some- 

 times bluish gray. 



Measurements. Skull : occipito-nasal length, 95 : total length, 110; 

 Hensel, 77; zygomatic width, 73; intertemporal wridth, 53; breadth of 

 braincase, 65; palatal length, 30; median length of nasals, 11; length 

 of upper molar series, 25 ; length of mandible, 76 ; length of lowrer 

 molar series, 29. 



The type of L. tschudi Pucheran, in the Paris Musetmi is prac- 

 tically in all respects the same as the present species. It is lighter in 

 color on back and tail but has undoubtedly faded, and also the animal 

 was not entirely mature. 



Bates writing on the species of Lagothrix (1. c.) which he calls 

 'Barrigudo Monkeys' says, "Of the remainder, the most remarkable 

 is the Macaco barrigudo, or big-bellied monkey of the Portuguese 

 Colonists, a species of Lagothrix. The genus is closely allied to the 

 Coaitas, (Ateles), having, like them, exceedingly strong and flex- 

 ible tails, which are furnished underneath with a naked palm like 

 a hand for grasping. The Barrigudos, however, are very bulky ani- 

 mals, whilst the Spider monkeys are remarkable for the slenderness 

 of their bodies and limbs. I obtained specimens of what have been 

 considered two species, one, (G. olivaceus of Spix?) having the head 

 clothed with gray, the other, (L. Humboldtii) with black fur. They 

 both live together in the same places and are probably only differently 

 colored individuals of one and the same species. I sent home a very 



