9. PITUKC1A. 59 



Fithecia, Lcsm. Brachyurus, Spix. Yarkea, Lesson. 

 See Monog., Gray, Proc. Zool. Soc. 18G0, p. 228; andAnat., Flower, 

 P. Z. S. 1802, p. 32G. 



I. Forehead and crown with a central black streak ; hair one-co- 

 loured. Fithecia. No. 1. 



II. Forehead and crown covered with hair, without any central 

 streak. Yarkea. 



a. Hairs whito-tipped. Nos. 2, 3. 



6. Hairs with a subterminal ring. No. 4. 



* Hair one-coloured. Fithecia. 



1. Pithecia leucocephala. The Blade Yarkee. 



Forehead with a central black streak, of mafc(?) yellow, of/emaZe(?) 

 white. 



9 Simia leucocephala, Amleb. Sing. vii. f. 2. Pithecia leucocephala, 

 Geoff. ; Gray, Zool. Sulphur, p. 12, t. 2 (head) ! Simia pithecia, 

 Schrch. t. 32. Fithecia ochrocephala, Kuhl, Beitr. p. 46. d P. 

 chrysocephala, I. Geoff. Cat. Mamm. p. 53 ; Archiv. du Mm. v. 

 p. 587, t. 29 ; Gray, P. Z. S, 18G0, p. 230 ! P. hiusta, Sfcix, Bras. 

 p. 15, t. 13 P Saki, Buffon, II. N. xv. t. 12. 



Hab. Brazil. 



The forehead is yellow when fresh, and white when faded by ex- 

 posure. M. Gcoffroy thinks the colour depends on the size of tho 

 specimen. 



** Hair harsh, white tipped. 



2. Pithecia monachus. The Yarkee. B. M. 



Black, grey- washed; hairs very long, harsh, white-tipped ; fore- 

 head and crown of male yellow, of female white. 



Yarque, Buffon, Suppl. yu. t. 30 (bad). Simia monachus, Humb. Pi- 

 thecia monachus, Geoff. Ann. du Mm. xix. ; Gray, P. Z. S. 1800, 

 p 230 ; Flower, P. Z. S. 1802, t. 37 ! Is. Geoff ; Castclnau, Expcd. 

 Amer. Sud, t. 3. P. hirsuta, Spix, Bras. t. P. quapa, Poeppig 

 P. noctuma, var., Lesson. P. irrorata, Gray, Zool. Sulph. p. 14, 

 t. 3 (forehead bald) ! Ann. $ Mag. N. II. 1842, x. p. 250 ! 



Hab. Brazil. 



The specimen described by M. Gcoffroy was young and in a very 

 bad state ; the one in the British Museum, figured in the < Voyage of 

 the Sulphur,' t., has the face quite bald. This is now shown to bo 

 accidental, as the others, more lately received, have white hairs on 

 tho faco. 



3. Pithecia albicans. The Whitish Yarkee. B. M. 



Yellowish white ; tail and largo patch on tho back black, slightly 

 washed with whito ; hairs with short white tips. Male, female, and 

 young alike. 



