SYNOPSIS OF THE SIMIAD^]. 269 



chestnut, beneath yellowish-gray ; four hand? brownish. 

 hlack ; face surrounded with a circle of ochreous-yellow. 

 Inhabits Cayenne. 



Described by Kuhl, from Temmink's Collection. 



GENUS XXIV. Hapales, ILLIGER. 



Muzzle short; facial angle 60. The upper lateral incisors 

 insulated ; the under lateral incisors longest ; inferior canine teeth 

 very small ; nails, except those of the hinder thumbs, in the 

 form of cla-ws ; tail longer than the body, and squirrel-like. 

 PLATE XXVII 1. H. VULGARIS, Ouistiti, or the Striated Mon- 

 key Ouistiti vulgare, Jacchus vulgaris, Geoff. Ann. du 



Mus. xix. 119; Desm. Mamm. 92. Simia jacclms, 

 Humb. Obs. ZooL i. p. 365. Deep gray ; lower part of 

 the back and tail banded with brown ; head of a chestnut. 

 red ; forehead with a white spot ; the hairs from the cheeks 

 and behind the ears nearly white, and very long. Inhabits 

 Guiana and Brasil. 

 Desmarest mentions a variety with the fur red, tinged with gray. 



2. H. PENICILLATUS, The Tufted Ouistiti Pinceau, Geoff. 

 Ann. du Mus. xix. 119. Ouistiti pinceau, Jacchus 

 penicillatus, Desm. Mamm. p. 94. Simia penioillata, 

 Humb. Obs. ZooL i. p. 365. Gray; tail and lower 

 part of the back banded with brown ; forehead with a white 

 spot ; hairs of the cheeks and behind the ears long and 

 black. Inhabits Brasil. 



3. H. LEUCOCEPHALUS, White-headed Ouistiti Ouistiti a 

 tete blanche, Jacchus leucocephalus, Geoff. Ann. du Mus. 

 xix. 119 ; Desm. Mamm. 94. Simia Geoffroyi, Humb. 

 Obs. ZooL i. 365. Hair red ; head and breast white ; 

 neck black ; tail tinged with brown and gray ; hair be- 

 hind the ears black and long. Inhabits Brasil. 



4. H. AURITUS, Eared Ouistiti Ouistiti oreillard, Jacchus 



auritus, Geoff. Ann. du Mus. xix. 119 ; Desm. Mamm. 



