NATURAL SCIENCES OF PHILADELPHIA. 



517 



he chestnut brown color of the senicula. Dr. Gray's 31. laniger is undoubtedly 

 of this species. 



Skulls. Current No. 578 A. N. S. Antro-posterior 4-55; occipitofrontal 

 2-15; bi-temporal 2 ; bi-parietal 25; facial angle 43 ; cranial capacity 4-25. 

 Current No. 3424 Smithsonian. Antro-posterior 4-3 ; occipito 2-0 ; bi-temporal 

 2 ; bi-parietal 2'5 ; facial angle 45 ; cranial capacity 4. 



Loiver Jaw. Current No. 578 ; angle to symphysis 3-2 ; angle to condyle 2-4; 

 angle to coronoid process 225 ; posterior molar to coronoid process I. Current 

 No. 3424; angle to symphisis 3-1 ; angle to condyle 2.4 ; angle to coronoid 

 process 2-25 ; posterior molar to coronoid process 1. 



Aluatta ursina. 



Stentor ursinus and fuscus, Geoff., Ann. du Mus., torn, xix., 1812, p. 108. 

 Simia ursina, flavicaudata et guariba, Humboldt, Rec. des Obs., torn, i., 1811, p. 



355. 

 Mycetes bicolor? Gray, Ann. and Mag. N. Hist., vol. xvi. 1845, p. 219. 

 Icon, Ilumb., Rec. des Obs. T. xxx. 



Adultus fuscus, fulvus. 



Catulus pilis nigris, apicibus fulvo-fuscis, artibus nigris aut fuscis. 



Adult. General color yellowish brown or brownish yellow; hairs of shoul- 

 ders annulated with black. 



Half grown. Body as in adult, limbs and tail very dark brown, approaching 

 black. 



Young. General color black, tips of hairs of body yellowish brown, base of 

 tail and anal region reddish brown. 



This species, as well as the following, is remarkable for the great variety of 

 coloration occasioned by age. The young at first sight appears of an intense 

 black color; but upon a closer examination, the hairs, more especially of the 

 back and sides of head, are found to be tipped with reddish brown. As the ani- 

 mal becomes older, the black gradually disappears, a yellowish brown color 

 appearing in its place, until in the adult the only remains of the black are to 

 be found in a few annulations in the hairs of the shoulders. 



Cur- 

 rent 



No. 



LOCALITY. 



Sex, 



From muzzle to 



Eye 



Ear 



Occ. 



Tail 



Tail 



Owned by 



Nature 



of 



Specimen. 



571 

 57 



Brazil 



2-1 



1-8 

 1-5 



4-3 



4 

 3 



4.8 



4-4 

 4 



21 



23 



17 



21 



22 



1! 



Academy 



f Mount- 

 (_ ed skin 



Skull. Antro-posterior 3-8 ; occipiro-frontal 2'3 ; bi-temporal 1-85 ; bi-parietal 

 1-9 ; facial angle 50 ; cranial capacity 3-75. 



Lower Jaw. Angle to symphysis 3 ; angle to condyle 2-05; angle to coro- 

 noid process 1-95; posterior molar to coronoid process 1-05. 



1862.] 



