C ALLICEBUS 243 



Nat., fasc. I, 1856, pp. 151, 153; Reichenb., Vollstand. 

 Naturg. Affen, 1862, p. 23, fig. 62; Sclat., Proc. Zool. Soc. 

 Lond., 1871, p. 219. (footnote). 



RED TIT1 MONKEY. 



Type locality. Banks of the Solimoens River, Brazil. Type in 

 Munich Museum. 



Geogr. Distr. Regions of the Peruvian Amazons; Solimoens, 

 Ucayali, Huallaga and Copataza rivers ; and Andoas, Ecuador. 



Color. Face black ; top of head gray, becoming orange rufous on 

 occiput, or buff-yellow on forehead grading into ferruginous on occi- 

 put, these colors due solely to the tips of the hairs which are black 

 on the basal portion ; upper parts reddish brown and black, the former 

 being the tips of the hairs, producing an annulated appearance; sides 

 of head, limbs, hands, feet, and under parts coppery red; tail mixed 

 grayish white and black, the basal portion like the back; hairs on 

 ears coppery red. Ex type Munich Museum. 



Measurements. Total length, 900; tail, 290; foot, 85; ex Spix's 

 type. Skull: occipito-nasal length, 56; zygomatic width, 39; inter- 

 temporal width, 36 ; palatal length, 18 ; width of braincase, 34 ; median 

 length of nasals, 6; length of upper molar series, 14; length of man- 

 dible, 38; length of lower molar series, 15. Ex specimen Brit. Mus. 



There is some variation among individuals of this species, and 

 some have the upper parts a uniform Vandyke brown, palest on the 

 center of the back, without the annulations so characteristic of the 

 typical style; the tail also is mixed ochraceous buff and black with a 

 buffy tip, the rest of the pelage however, being coppery red as in the 

 others. 



Specimen in Paris Museum marked Callithrix discolor I. 

 Geoff, et Deville, type, cannot be separated from the present species. 

 It is somewhat faded in the lighter colors, but otherwise resembles 

 C. cupreus. There are several examples in the Munich Museum 

 obtained by Spix and all marked 'Type.' From one of these my 

 description was taken. 



Mr. E. Bartlett, (1. c.) says that this Monkey is equally dis- 

 tributed, but not so numerous as Saimiri ustus, in fact it may be 

 regarded as rather rare, that is in eastern Peru. He procured it at 

 Cashiboya on the Ucayali and at Santa Cruz on the Huallaga. 



Callicebus caligatus (Wagner) . 



Callithrix caligata Wagn., Wiegm., Archiv., I, 1842, p. 357; Id. 

 Schreb., Saugth. Suppl., V, 1855, p. 116; Reichenb., Voll- 



