C ALLICEBUS 249 



Measurements. Skull : intertemporal width, 32 ; breadth of brain- 

 case, 36 ; palatal length, 18 ; zygomatic width, 42 ; median length of 

 nasals, 8.5; length of upper molar series, 15; length of mandible, 42; 

 length of lower molar series, 17; occipital region gone. Ex type 

 British Museum. 



Catj.icebus semulus Thomas. 



Callicebus remiilus Thos., Ann. Mag. Nat. Hist., II, 1908, 8th 

 Ser., p. 88. 



Type locality. Santarem, Lower Amazon, Brazil. Type in 

 British Museum. 



Genl. Char. Similar to C. hoffmannsi but under parts rufous. 



Color. Forehead yellowish white ; top of head gray ; nape and 

 dorsal region like C. hoffmannsi, being dark rufous, the black hairs 

 being ringed and tipped with that color ; sides of body grizzled grayish 

 brown ; outer sides of limbs grayish brown grizzled, but paler than 

 the flanks ; under side of limbs and under parts rufous, this color 

 showing on side of legs from above; hands and feet grayish white; 

 whiskers pale rufous, base of hairs yellowish ; tail black, the hairs 

 yellowish at base ; root of tail rufous ; ears black sparsely covered with 

 gray hairs. Ex type British Museum. 



Measurements. Total length, 705; tail, 420; foot, 82. Skull: 

 occipito-nasal length, 53.3 ; Hensel, 42.4 ; zygomatic width, 48 ; palatal 

 length, 27.2 ; median length of nasals, 17.1 ; length of upper molar 

 series, 14.3 ; length of mandible, 39 ; length of lower molar series, 25.5. 

 E.x type British Museum. 



The type which represents the species in the British Museum Col- 

 lection is a young adult with the teeth entirely unworn. In various 

 respects it resembles C. hoffmannsi and it comes from the same place, 

 Santarem, but the gray hands and feet, and rufous under parts easily 

 distinguish it. It is desirable to have more specimens so as definitely 

 to determine whether two species of this genus really are found in 

 practically the same locality, or whether age and sex may not account 

 for the different coloring in the types of C. remulus and C. hoff- 

 mannsi. 



The type of the present species is much smaller than that of 

 C. hoffmannsi as would be expected considering the difference of age. 



Callicebus donacophilus (D'Orbigny). 



Callithrix donacophilus D'Orbigny, Voy. Amer. Merid., Mamm., 

 1847, p. 10, pi. V; Wagn., Schreb., Saugth. Suppl., I, 1840, p. 



