20 REPORT ON ZOOLOGY, MDCCCXLIIT. 



C. Baluin to its allied forms from individual specimens in collections and 

 menageries, but tliat we must expect to determine these relations only from 

 observations of the animals in their native localities. I will merely observe, 

 that I had an opportunity, a short time since, of seeing in a travelling me- 

 nagerie a male and female, exactly such as Is. Geoffroy describes his C. Bab/iln, 

 and that I regarded the individual described by me (Schreb. Suppl. i, p. 157), 

 which I did not obtain until dead, and the colour of whose face I \vas given 

 to understand was lighter during life, as one and the same species. 



SIMI.E TRANSATLANTICS. In the first half of the Zoo- 

 logy of the Voyage of the Sulphur, Gray has given figures 

 of Brachyteles front atus, Pithecia poyonias, leucocephala 

 (bare head), and irrorata, besides a notice on Cebus hypo- 

 leucos. 



Upon this I refer to my remarks in last year's Report, adding that P. irro- 

 rata (Gray) is nothing else than P. hirsuta, and very well figured. 



With respect to the genus Cebus, I will only in passing remark, that I am 

 now enabled, by Natterer's communications on its geographical limits, to 

 distinguish more species than the two formerly received, although with regard 

 to others, where such accounts are deficient, I am just as much in the dark 

 as before. 



Of the Nocturnal Apes and Saimiris, more species than 

 have hitherto been admitted have been distinguished by Is. 

 Geoffroy. (Inst. 1843, p. 178.) 



To each genus he refers 4- sp., viz. (1) Nyctipithecus felinus, Spix; (2) N. 

 lemurinus Is. G., from New Granada ; (3) N. trivirgatus, Humb. ; (1) N. vo- 

 ciferans, Sp. With respect to N. felinus and trioirgatus, accordingly, Is. 

 Geoffroy comes to the same conclusion as that expressed by the reporter last 

 year. The four species of Saimiris (Chrysotkrix) are: (1) S. sciureus; (2) S. 

 notus, Is. G. ; (3) S. lunulutm, found by Humboldt; and (4) S. entomopliagus. 

 The new species will probably be described at length in the zoology of the 

 voyage of the Venus, when more will be said about them. 



lacchus rufiv enter has been instituted as a new species of 

 Marmozette by J. E. Gray. (Ann. Nat. Hist, xii, p. 398.) 



Black, grisled from the white points of the hair, which are more abundant 

 on the flanks and thighs ; breast, inside of legs, under side of the body, and 

 a spot in the middle of the vertex, chcsuut-brown ; tail long and black ; 

 cars large, not pencilled : from Mexico. It is totally different from Ilapalc 

 nielanura, and appears to be a distinct species, and very remarkable ou 

 account of its habitat. 



