LEONTOCEBUS 203 



our present knowledge of the changes that may occur towards the 

 adult state, in uniting them. 



The examples are both quite small, and judging from the teeth 

 that show in the open mouth, the type is the younger animal, but the 

 white face, only displayed in the front part of the whiskers of L. 

 DEViLLii, and the general reddish brown color of the pelage, with the 

 absence of mottling on the lower back, cause the two types to appear 

 so different that it would seem best to permit them to remain under 

 different names until we have more knowledge as to the respective 

 changes, if any, which may occur in the coloration of the pelage of L. 

 DEVILLII from the youthful to the adult state. 



Measurements. Size equal to L. devillii. Skull in the specimen. 



Leontocebus devillii (I. Geoffrey). 



Hapale devilli I. Geoff., Compt. Rend., XXXI, p. 875. 



Midas devilli I. Geoff., Cat. Primates, 1851, p. 64 ; Id. Archiv. Mus. 

 Hist. Nat., Paris, V, 1852, p. 570 ; Casteln., Exped. Amer. Sud, 

 Mamm., 1855, p. 22, pi. VI, fig. 13 ; Dahlb., Stud. Zool. Fam. 

 Reg. Anim. Natur., fasc. I, 1856, pp. 191, 195; Reichenb., 

 Vollstand. Naturg. Affen, 1862, p. 13, no fig.; Gray, Cat. 

 Monkeys, Lemurs and Fruit-eating Bats, Brit. Mus., 1870, 

 p. 67, var. b; Bartl., Proc. Zool. Soc. Lond., 1871, p. 220, 

 pi. XIII. 



Hapale devillei Schleg., Mus. Pays-Bas, Simiae, 1876, p. 262. 



Midas leucogenys Gray, Cat. Monkeys, Lemurs and Fruit-eating 

 Bats, Brit. Mus., 1870, p. 67. 



Midas zveddeli Forbes, Handb. Primates, I, 1894, p. 143. (Part.). 



DEVILLE'S TAMARIN. 



Type locality. Banks of the rivers Ucayali and Huallaga near 

 Sarayaqu, eastern Peru. Type in Paris Museum. 



Geogr. Distr. Eastern Peru. 



Color. Head, chin, throat, hands, feet and tail except at base, 

 black ; back between shoulders, outer side of arms, black, hairs tipped 

 with cinnamon rufous ; back black, hairs tipped with buff, giving to this 

 part a mottled appearance ; rump, base of tail, and legs inner and outer 

 sides, dark burnt sienna ; edge of thighs at and below knee, blackish, 

 hairs tipped with burnt sienna ; under parts, from lower part of throat 

 to groin, reddish chestnut. Ex type in Paris Museum. 



Measurements. Total length, 530; tail, 340. Skull: occipito-nasal 

 length, 43 ; Hensel, 31 ; zygomatic width, 31 ; intertemporal width, 22; 



