LEONTOCEBUS 201 



Midas chrysopygus Forbes, Handb. Primates, I, 1894, p. 144. 

 Marikina chrysopygus Reichenb., Vollstand. Naturg. Affen, 1862, 

 p. 9, fig. 31. ' 



YELLOW-TAILED TAMARIN. 



Type locality. Ypanema, Province of Sao Paulo, Brazil. 



Geogr. Distr. Known only from the vicinity of Ypanema, Sao 

 Paulo, Brazil. 



Color. Head, neck, entire body above and beneath to rump and 

 vent, arms, edge of thighs, hands and feet jet black, with a few white 

 hairs above eyes ; rump and thighs golden, grading into rusty red near 

 ankles; base of tail like rump, remainder black. Ex specimen in 

 Leyden Museum. 



Measurements. In size about equal to L. nigricollis ; skull in the 

 example. 



This is a black Tamarin, and differs from L. nigricollis in hav- 

 ing the body all black, and in the different coloring at base of tail. It 

 is rare in collections, and so far as I could learn, has only been procured 

 from the vicinity of Ypanema, Sao Paulo Province, where Natterer 

 obtained it. 



Leontocebus mystax (Spix). 



Midas mystax Spix, Simiar. et Vespert. Bras., 1823, p. 29, pi. 

 XXII; I. Geoff., Cat. Primates, 1851, p. 64; Casteln., Exped. 

 Amer. Sud, Mamm., 1855, p. 21 ; Dahlb., Stud. Zool. Fam. 

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

 Acad. Nat. Scien. Phil., 1861, p. 104; Reichenb., Vollstand. 

 Naturg. Affen, 1862, p. 12, fig. 4; Gray, Cat. Monkeys, 

 Lemurs and Fruit-eating Bats, Brit. Mus., 1870, p. 66. 

 Hapale mystax Wagn., Schreb., Saugth. Suppl., V, 1855, p. 129; 



Schleg., Mus. Pays-Bas, Simiae, 1876, p. 261. 

 Type locality. Banks of the Solimoens River, Brazil. Type in 

 Munich Museum. 



Geogr. Distr. Forest between the Solimoens and Iga rivers, 

 Brazil. 



Color. Head, arms above and beneath, chin, throat, inner side 

 of legs, hands and feet, black ; lips white ; back of head, and upper part of 

 body and flanks black, the hairs dirty white at base and tipped with 

 tawny, this color hardly perceptible on nape and between the shoulders, 

 but increasing on upper back and flanks, and giving the prevailing tint 

 to these parts ; lower back, base of tail, rump, and outer side of legs, 



