750 CLASS XVII. 



Sp. Nyctipiihecus trivirgatus, Aotus trivirgatus HUMB. 1. 1. PI. 28, Cuv. R. 

 Ani., 3d. ill., Mammif. PI. 18, fig. 2; Nyctipithecus felinus SPIX, GEOFFR. 

 et Cuv. Mammif. Livrais. 43, GUR. Iconogr., Mammif. PI. 5, fig. I ; 

 douroucouli; grey-brown, ruddy below; white above the eyes and a large 

 black spot on the forehead. These animals sleep by day, live in pairs, and 

 eat not fruits only, but hunt also for insects and small birds. They repre- 

 sent the Lemurs in South Africa. Very similar is Nyctipithecus lemurinus 

 IBID. GEOFFR., Archives du Mus. IV. PI. 2, the same species, according to 

 WAGNER, as Nyctip. vociferans Spa 1 . 



Callithrix GEOFFR. Incisor teeth straight. Eyes moderate. 

 Tail slender, round. 



Callithrix (in stricter sense). Two middle upper incisors broad. 

 Canines short, scarcely longer than incisors. (Lower jaw high.) 



Sp. Callithrix personata GEOFFR., Simia personata HUMB., PRINC. MAX. 

 Abb. zur Naturgesch. Bras. Lief. 2, SCHREB. Saugth. Tab. 30 A; Callithrix 

 mdanochir PR. MAX. Lief. 4, &c. 



Chrysoihrix KAUP. Canine teeth large; first molar tooth larger 

 than rest, conic, with accessory internal basal tubercle. 



Sp. Callithrix sciurea, Simia sciurea L., BUFF. xv. PI. 10, SCHREB. Saugth. 

 Tab. 30, Cuv. R. Ani., ed. ill., Mammif. PI. 17, fig. 3; the Saimiri, 

 greyish-ruddy ; legs yellowish, tip of tail black. 



ft Tail prehensile. (Last caudal vertebrae dilated.) 



Cebus GEOFFR. Head rounded. Feet congruous. Tail long, 

 hairy throughout. 



Sp. Cebus fatuellus ERXL., Simia Fatuellus L. and Simia ApeUa ejusd. (the 

 young animal), BUFF. Suppl. vn. PL 29, AUDEB. Singes, v. 2, PI. i ; the 

 young animal figured by LINN^DS, Mus. Ad. Frid. Tab. i, BUFF. xv. 

 PL 4, AUDEB. 1. 1. PL 2, GUR. Iconogr., Mammif. PL 4, fig. 2 ; brown, 

 the legs and tail black ; the old animal with the hair in two distant tufts 

 on each side at the top of the head ; five lumbar vertebrae ; Cebus capu- 

 cinus ERXL., Simia capucina L., Mus. Ad. Frid. Tab. n. BUFF. xv. PL 8, 

 AUDEB. 1. L PL 4; smaller, brown; face and throat greyish-yellow ; head 

 black above ; six lumbar vertebrae, &c. 



Compare on this genus BURMEISTER Abhandl. d. Nat. Oesellsch. zu 

 Halle, n. 1854, s. 8 1 124. 



Ateles GEOFFR., ILLIG. (more correctly Atelochirus). Head 

 rounded. Extremities slender, very long; fore feet with thumb 

 none or very short. Tail towards the tip naked below. 



1 The skeleton of one of these species (Nyctip. felinus) is figured in J. GISTL 

 Beschreibung des Sketes des dreistreifigen Nachtaffers, Leipzig, 1836, 8vo, and by WAG- 

 NER Abhand. der Milnchn. Akadem., math. i. physilc. Klasse n. s. 420432, Tab. I. 



