LAGOTHRIX 61 



p. 107; Id. Cours Hist. Nat. Mamm., 1828, p. 35, 9me Legon; 

 Kuhl, Beitr. Zool., 1820, p. 27; Desm., Mamm., 1820, p. 77; 

 Schinz, Syn. Mamm., I, 1844, p. 71 ; I. Geoff., Cat. Primates, 

 1851, p. 50; Pucher., Rev. Mag. Zool., 1857, p. 39, pi. 

 XXVIII; Reichenb., Vollstand. Naturg. Affen, 1862, p. 72, 

 figs. 176, 177. 

 Gastrimargus olivaceus Spix, Simiar. et Vespert. Bras., 1823, p. 



29, pi. XXVIII. 

 Lagothrix cana Wagn., Schreb., Saugth. Suppl., I, 1840, p. 186, 



pi. XXVI E ; Schleg., Mus. Pays-Bas, Simiae, 1876, p. 162. 

 Lagothrix olivacea Wagn., Schreb., Saugth. Suppl., V, 1855, p. 



73. 

 Lagothrix geoffroyi Pucher., Rev. Mag. Zool., 1857, p. 296, (nee 



Schinz). 

 Type locality. "Probablement le Bresil." 



Geogr. Distr. Mouth of the Rio Tocantins, (Spix), to the forests 

 along the Rio Solimoens. 



Gent. Char. Under parts ochraceous. 



Color. Narrow line on forehead and sides, buff ; top of head and 

 nape dark brown with a reddish tinge; back, flanks and limbs, buffy 

 gray; forearms and legs below knees darker; inner side of limbs black- 

 ish ; hands and feet blackish brown ; throat reddish brown ; under 

 parts ochraceous ; tail above dark brown on basal half, remainder gray 

 tinged with reddish, beneath dark brown. 



Measurements. Smaller than the other members of the genus. 

 Skull : occipito-nasal length, 83 ; Hensel, 68 ; zygomatic width, 60 ; inter- 

 temporal width, 48 ; median length of nasals, 9 ; length of upper molar 

 series, 19 ; length of mandible, 64 ; length of lower molar series, 30. 



The example in the Paris Museum marked as Geoffroy's type 

 was obtained from the 'Cabinet de Lisbonne' in 1809. It is immature, 

 in good condition though somewhat faded, and is yellowish gray with a 

 reddish brown head, and tail and limbs like the body but darker. Much 

 of the fur has fallen from the chest and abdomen but what remains is 

 a dark ochraceous rufous, and there is no evidence of any black color 

 having been present. There are two specimens in the Museum, adult 

 and young, the latter stated to have come from Brazil. 



The type of Gastrimargus olivaceus Spix, in the Munich Museum 

 agrees in all respects with Geoffroy's type, and Spix's name must 

 become a synonym of L. cana. It is quite different both in color and 

 texture from G. infumatus Spix. A young individual of G. olivaceus 



