LEONTOCEBUS 209 



A co-type of this species is in the British Museum Collection. It 

 is peculiarly colored and very difficult to describe. The general appear- 

 ance is that of a grayish brown creature with a black head and neck, 

 and speckled with lighter brown on the body and hind legs. The base 

 of the tail is lighter than the body, and the fur generally is so shiny that 

 the color is very difficult to see, and varies constantly according as the 

 light shines upon it. Unfortunately no skull accompanied the skin. 



Leontocebus iMPERATOE (Goeldi). 



Midas imperator Goeldi, Proc. Zool. Soc. Lond., I, 1907, p. 93, fig. 

 2Z. 



Type locality. Rio Purus, tributary of the Amazon, western 

 Brazil. 



Gent. Char. Moustache of long white hairs extending beyond 

 the face to the ears ; tail longer than body. 



Color. Sides of head, face, hands, and tufts on ears black ; middle 

 and back of head black and hazel mixed; lips white, from upper lip 

 extends a long white moustache ; throat black and gray ; upper part of 

 body, arms and outer side of legs huffy gray, the hair being black with 

 buflF tips ; breast, lower part of belly, and inner side of legs, pale burnt 

 sienna ; middle of belly pale vinaceous cinnamon ; tail above black, 

 beneath burnt sienna at base, graduating into pale reddish brown, and 

 then into black for apical half. Ex specimen British Museum. 



Subgenus Marikina. 



Mane large ; lips not white. 



Leontocebus EOSAEiA (Linnaeus). 



Simia rosalia Linn., Syst. Nat., I, 1766, p. 41 ; Schreb., Saugth., 



I, 1775, p. 130, pi. XXXV; Shaw, Genl. Zool., T, 1800, p. 64, 



pi. XXV, fig. 

 Callithrix rosalia E. Geoff., Ann. Mus. Hist. Nat. Paris, XIX, 



1812, p. 121 ; Id. Cours Hist. Nat. Mamm., 1828, p. 36, lOme 

 ' Legon: I. Geoff., Cat. Primates, 1851, p. 62; Dahlb.. Stud. 



Zool. Fam. Reg. Anim. Nat., fasc. I, 1856, pp. 188, 192; 



Gulliv., Proc. Zool. Soc. Lond., 1875, p. 493. 

 Jacchus albifrons Desm., Mamm., Suppl., 1820, p. 534. 

 Leontocebus pithecus marikina Less., Spec. Mamm., 1840, p. 200. 

 Marikina albifrons Reichenb., Vollstand. Naturg. Affen, 1862, p. 



9, pi. II, figs. 29. 30. 



