4 MR. P. L. SCLATER ON AMERICAN QUADRUMANA. [Jail. 2, 



are also peculiar to the species. The ear-conchs are large and pro- 

 minent, and in the present specimen nearly, if not quite, devoid of 

 hairs. It is, however, possible that this may be partly due to the 

 animal having been sick in captivity. 



From N. felinus, of which I exhibit a fine Nattererian specimen, 

 the present species is at once distinguishable by its much paler colour 

 and by the indistinctness of the head-stripes. 



I trust that we shall shortly receive further examples of this 

 interesting animal, so that I may be enabled to give a more perfect 

 account of its distinctive characters. 



4. Cebtjs iiypoletjcus, Geoffr. ; Sclater, Nat. Hist. Rev. 1861, 

 p. 509 ; v. Frantzius, Wiegm. Arch. 1869, p. 259 ; Gray, Zool. Voy. 

 Sulphur, p. 10. 



The only Cebus of which I have seen Central- American specimens 

 is Cebus hypoleucus, or the nearlv allied form of it (if distinct) 

 called by Dr. Gray Cebus leucocephalus (P. Z. S. 1S65, p. 825). Of 

 this there are specimens in the British Museum from Costa Rica 

 and Nicaragua, collected in both localities by Arce. 



5. Ateles melanochir. 



Ateles melanochir, Desm. Mamm. p. 76. 



Ateles geoffroii, Kuhl. 



Ateles melanochir, A. ornatus et A. albi/rons, Gray, Cat. Monkeys, 

 pp. 43, 44. 



Ateles variegatus et Eriodes front at us, v. Frantzius, Wiegm. Arch. 

 1869, p. 258. 



In some recent remarks on this species (P. Z. S. 1871, p. 226) I 

 came to the conclusion that A. ornatus and A. melanochir were mere 

 varieties of the same species. We have recently received more living 

 examples of this Spider Monkey from Nicaragua. Amongst themes 

 one nearly resembling the fine grey specimen formerly in General 

 Fox's possession, upon which Dr. Gray has based his A. albi/rons. 

 This I now believe to be also merely a variety of A. melanochir, of 

 the variations in colour of which Dr. v. Frantzius has already spoken 

 (I. s. c. p. 257). 



I have given the evidence as to the probable occurrence of this 

 species in Southern Mexico in my article in the ' Nat. Hist. Review,' 

 1861, p. 509. 



In Guatemala, Mr. Salvin tells me, this species is confined to the 

 Pacific coast-region. A skin of Mr. Salvin's in the British Museum 

 is of the variety called A. ornatus by Dr. Gray, which I have figured 

 on a former occasion (P. Z. S. 1871, pi. xv.). Dr. v. Frantzius tells 

 us that a specimen in the Basel Museum obtained in the same 

 country by Dr. Bernouilli does not differ from Costa-Rican exam- 

 ples. There is also in the British Museum a skin of this Spider 

 Monkey procured by Salvin's collector Arce near Calovevora, in 

 Veragua (belonging to the form A. ornatus) ; so that this species 

 of Ateles appears to extend over Central America from Southern 

 Mexico to Veragua. 



