8 PRIMATES. 
2. Ateles rufiventris. 
Ateles vellerosus (?), Sclater, P. Z. 8. 1871, p. 478 (nec Gray)". 
Ateles rufiventris, Sclater, P. Z. S. 1872, p. 688, t. lvii. (descr. orig.)?; Schlegel, Mus. Pays-Bas, vii. 
p- 182°. 
Hab. Panama (Mus. Lugd.*).—Coromaia (Mus. Brit.1?). 
A young Spider-Monkey, obtained by an American surveying-party on the River 
Atrato in Northern Colombia, was purchased alive by the Zoological Society in 1871, 
and was at first doubtfully assigned to A. vellerosus!. On its death, however, Mr. 
Sclater was able to examine it more closely, and decided that it belonged to an un- 
described species, for which he proposed the name here adopted *; this specimen is now 
in the British Museum. Since then an adult, “ tué en Panama,” has been obtained for 
the Leyden Museum, thus bringing the species within our limits®. 
Nothing further has yet been recorded of this little-known species, which might 
be regarded as an extreme dark form of A. geoffroyi were it not for the clear definition 
of its two colours. This is even more marked in nature than in Mr. Sclater’s plate, in 
which the rufous of the lower parts is hardly bright enough. 
3. Ateles geoffroyi. 
Ateles geoffroyi, Kuhl, Beitr. z. Zool. p. 26 (1820, descr. orig.)'; Schlegel, Mus. Pays-Bas, vii. 
p. 181°. 
Ateles melanochir, Desmarest, Mamm. p. 76 (1820, descr. orig.)*; Sclater, P.Z.S. 1871, p. 226, 
t. xv.4; 1872, p. 4°; 1875, p. 419, tt. xlvii., xlix.° . 
Eriodes frontatus, Gray, Ann. & Mag. Nat. Hist. x. p. 256 (1842, descr. orig.)’; Zool. Voy. ‘ Sul- 
phur,’ p.9, t.i.°; Sclater, P.Z.S. 1862, p. 186°; Frantzius, Arch. f. Naturg. xxxv. 1, p. 258”. 
Ateles ornatus, Gray, Cat. Monkeys &c. Brit. Mus. p. 44 (1870, deser. orig.)". 
Ateles albifrons, Gray, loc. cit. (descr. orig.)". 
Ateles hybridus, Gray, tom. cit. p. 43 (descr. orig.)"*; Sclater, P. Z.S. 1862, p. 186 (nec Geofir.)™. 
Ateles variegatus, Frantzius, Arch. f. Naturg. xxxv. 1, p. 257 (nec Wagn.)”. 
Mico, Mono Colorado of Costa-Ricans”. 
Hab. Nicaracva, Culebra (Belcher, Mus. Brit.®), 8. Juan del Norte (Manley Wood, Mus. 
Brit.3; Greey), Greytown (Zool. Soc. Viv.t); Costa Rica (Salvin, Mus. Brit.), 
Volcan Barba (Hoffmann, Mus. Berol.'°), Trazu (Frantzius 1°); Panama, Calovevora 
(Arcé, Mus. Brit.5), Colon (Zool. Soc. Viv.).—CotomBia (Zool. Soc. Viv.) 
The paler form of this very variable species was first described by Kuhl! and by 
Desmarest3, apparently from the same specimen (without locality) in the Paris Museum. 
Both descriptions bear the same date; but as Desmarest repeatedly refers to the work 
of the German zoologist, it is evident that the latter’s name has priority ; and the term 
melanochir having been usually applied to the pale form only, the change does not 
appear to be inconvenient. A reddish specimen from Nicaragua was separated with 
