1871. J MR. E. BARTLETT ON PERUVIAN MONKEYS. 219 



3. Lagothrix infumatus*. Brown Lagothrix. 



This large Monkey is found on the rivers Ucayali and Huallaga> 

 and over the whole of the valley of the Peruvian Amazons. It is 

 very common in the forests in the low country. They are met with 

 in pairs ; sometimes from four to six pairs are found to inhabit the 

 same large trees. Not unfrequently they are in company with the 

 Mycetes. 



These Monkeys are much sought after for food ; and from their 

 great abundance are extensively used for this purpose by both Indians 

 and whites. 



4. Mycetes seniculus-|\ Golden Howler. 



This Howler furnishes the principal animal food used by the in- 

 habitants of the borders of the rivers Ucayali and Huallaga. These 

 Monkeys keep to the low lands and the shores of the rivers, always 

 travelling in pairs. When a Mycetes is shot it always hangs to the 

 tree, even if quite dead, and does not fall down until some hours 

 afterwards, when the muscles become relaxed. Therefore, if fresh 

 food is an immediate object, it is better to kill a Lagothrix, in which 

 this peculiarity does not occur. 



5. Saimaris tjsttjs, Is. Geoffr. 



This is a common species, inhabiting the whole of the Peruvian 

 Amazons, and may be met with on every stream. They are fre- 

 quently seen moving about in large numbers through the forest. 



6. Callithrix cuprea, SpixJ. Red Tee-tee. 



This Monkey is equally widely distributed, but not so numerous, 



* [Mr. Bartlett has submitted four skins of this species to my examination. 

 In those marked males the size is rather larger, the black hair on the breast and 

 belly much more developed, and the back more greyish. The skins measure: — 



1. $ Long. corp. 25 una, caudaj 23 una, tota 48 - una 



2. 6" „ 24 „ „ 22 „ „ 460 „ 



3. ? „ 20 „ „ 23 „ „ 430 „ 



4. <?jr „ 20 „ „ 23 „ „ 43-5 „ 



I do not doubt this being the Gastrimargus infumatus of Spix ; and as they 

 were obtained in the same district as Lagothrix castelnavii of Is. Geoffrey and 

 Deville (Casteln. Esp. p. 5, pi. 1), I am inclined to agree with Wagner (Saugeth. 

 v. p. 73) in considering the latter not really distinct. — P. L. S.] 



t [I consider Simla ursina of Humboldt (established on specimens from Ca- 

 raccas) to be identical with the species commonly called Mycetes seniculus (i. e. 

 M. saturate eastaneo-rufus unicolor ; dorso medio fidvo). But Mycetes tirsinus 

 of P. Max. and other authors, of the wood-region of S.E. Brazil, is certainly 

 different, and should be called M. fuscus (cf. Wagner, Abb. bay. Ak. v. p. 409). 

 Mr. Bartlett's skin from Chaniicuros seems to me to be referable to the true 

 M. seniculus — a species not heretofore certainly known to extend into Eastern 

 Peru. But Mr. Bartlett tells me this is the only Mi/cetes which he met with. — 

 P. L. S.] 



\ [I consider Wagner (Saugeth. v. p. 114) quite right in referring C. discolor 

 of Is. Geoffrey to C. cuprea of Spix. Spix gives the Upper Amazons, frontiers 

 of Peru, as its locality. Deville's specimens of Callithrix discolor were obtained 

 from Sarayaeu and other places in the same district as that which Mr. Bartlett 

 has collected in. — P. L. S.] 



