NATURAL SCIENCES OF PHILADELPHIA. 



515 



Lagothrix cana and Humboldtii, Geoff., Ann. du Mus., vol. xix. 1812, p. 107. 



Gastrimargus infumatu3 et olivaceus, Spiz, Sim. et Vesp., 1823, p. 39. 



Cebus lagothrix, Fischer, Synopsis, 1829, p. 41. 



Lagothrix capparo, Lesson, Species, 1840, p. 125. 



Lagothrix poppigii et infumata, Schinz , Synopsis, 1844, pp. 71 and 72. 



Lagothrix Castelnaui, /*. Geoff, and Deville, Comptes Rendus, vol. xxvii. 1848, 



p. 49C. 

 Capparo, Humboldt. 

 Icones, Spiz, Sim. et Vesp., tab. 28 and 29. 



L. Mas brunneus cum cana admixta ; facie nuda et nigra ; capite et manibus 

 nigris ; femoribus et cauda brunneo-fusca. 



Foemina olivacea; pilis capites niger. 



Catulus olivaceo-canus ; capite manibus et cauda infera nigro-fuseo. 



Hab. Brazil, Bolivia, Venezuela, Peru. 



Adult male, general color reddish brown, dashed with hoary gray, the hairs 

 being brown at their bases, tipped with gray ; the brown predominating upon 

 the internal surface of limbs and perineal region ; belly dark brown, sometimes 

 black, terminal portion of tail and top of head black; face naked and black, 

 upon the lips a few scattered white hairs: 



Female, general color olive yellow or brown ; head black. 



Young, hoary grey, darker on belly and internal surface of limbs ; hands 

 and top of head black. 



The great variety of coloration in this species resulting from age and sex has 

 led to great confusion in its nomenclature. I have examined with great care 

 specimens of the various so-called species, and believe them all to be one and 

 the same. The collection at the Jardin de3 Plantes, contains specimens la- 

 belled canus, Humboldtii, and Castelnaui, those of the canus (including the 

 typical specimen, part of the spoils of Bonaparte from Portugal,) are, as may 

 be seen by reference to the catalogue, (page 50,) all young males, and Isidore 

 Geoffroy himself expresses a doubt as to its being distinct from the Humboldtii. 

 Ayoung specimen, (No. 28,) in the collection of the Academy, presented in 1857, 

 the coloration of the Castelnaui, answering perfectly the description given by 

 Isidore Geoffroy and Deville ; by exposure to light and the camphorated and 

 arsenical vapors of the museum, the color has slightly faded, and the specimen 

 now answers perfectly the description of the canus. The L.poeppigii I have never 

 seen, but the description by Schinz (L. notseo castaneo fusco ; gastraeo niger- 

 rimo ; facie nuda nigra rugosa, Synopsis mammalium, p. 72,) does not differ es- 

 sentially from that of the adult Humboldtii. 



Skull of No. 3238, occiput broken Antro-posterior ?; occipitofrontal ? ; bi- 

 temporal 2-2 ; bi-parietal 24; cranial capacity ? ; facial angle 50. 



Lower jau: Angle to symphysis 2-G; angle to condyle 1 -95; angle to coro- 

 noid process 1*8; posterior molar to coronoid process 8-5. 



Genus IV. ALUATTA, Lacepede. 



Simia (parte) Liun., Ed. xiii. 1788, p. 26. 



Cebus, Cuv. and Geoff., Magazin Encjclopedique, vol. i. 1795, p. 71. 



Aluatta, Lacfpede, Mem. de l'lnstitute, 1777, p. 489. 



Mycetes, Illiger, Prodromus, 1811, p. 70. 



Stentor,' Geoff., Mem. du Mus., 1812, p. 107. 



1862.] 



