688 mr. p. l. sclater on animals [June 4, 



3. Additional Notes on rare or little-known Animals now or 

 lately living in the Society's Gardens. By P. L. Sclater, 

 M.A., Ph.D., F.R.S., Secretary to the Society. 



[Received May 17, 1872.] 



(Plates LVII.-LIX.) 



In finally revising the new list of Vertebrata now or lately living 

 in the Society's Gardens, I have found it necessary to investigate again 

 the history of certain rarer species either incorrectly determined or 

 not included iu the first proof of the 'List.' I have therefore a few 

 notes to offer to the Society supplementary to those already given 

 in the 'Proceedings' for last year*. 



1. Ateles rufiventris, sp. nov. (Plate LVII.) 

 Aides vellerosus, Sclater, P. Z. S. 1871, p. 478 (err.). 



The young female Spider Monkey received April I lth, 1871, and 

 doubtfully referred, in my report on the additions for that month 

 (P. Z. S. 1871, p. 478), to Ateles vellerosus, being since dead, 1 have 

 been able to examine it more closely, and 1 now exhibit its skin. It 

 is certainly not A. vellerosus, that species being the Mexican repre- 

 sentative of A. beelzebulh, which 1 have lately redescribed and figured 

 in the Society's 'Proceedings' (see anted, p. b, PI. II.) ; and I must, 

 though unwillingly, give it a new name, as I cannot refer it to any 

 described species. 



I should have been inclined to suppose it to be possibly a variety 

 of A. ater, had it not been for its flesh-coloured face. There is, 

 however, no difficulty in believing that a distinct species of Ateles 

 may be found on the Atrato river, where this was procured ; and 

 the adult animal may exhibit the specific characters more strongly. 

 The species may be diagnosed as follows : — 



Ateles rufiventris, sp. nov. 



Ater : yastrceo rufescente : facie carnea : pilei pi/is elonyatis 

 projeclis, in fronte ipsa retroversis : lony. corp. 12, cundce 

 15*5 : manuum pollice nullo. 

 Hub. Columbia, in ripis fl. Atrato. 



2. Saimaris usta, Is. Geoffr. 



On the 4th of July last year we received "on deposit" a Squirrel 

 Monkey, which is still living in the Monkey-house. This little ani- 

 mal has interested me much, as being quite new to me, and readily 

 known from the somewhat variable Saimaris sciurea (of which we 

 have frequently received specimens) by its naked ears. It is no doubt 

 the Saimaris usta of Is. GeofTroy (Arch. d. Mus. iv. p. 6, t. 1); 

 but as Wagner has reunited this species to S. sciweaf, I think it 



* See P. Z. S. 1871, pp. 221, 489, & 743. 

 f See Abb. bayer Ak. Munch, v. p. 458. 



