224 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 69 



by W. W. Brown, Jr., at Bugaba and says : " The squirrel monkey 

 is common in the scrubby forest of the foothills of the Volcan de 

 Chiriqui. It was very tame, and Mr. Brown states that often little 

 parties of them, would follow him about in the underbrush, chatter- 

 ing, and allowing him to come so near that he could almost put his 

 hand on them. It is a beautiful creature, with a long tasselled tail, 

 and is admirably shown in Alston's plate in the Biologia Centrali- 

 Americana. Mr. Brown states that he never saw a creature that he 

 disliked so to kill, and after he had secured five specimens, nothing 

 would induce him to molest the little troupes that accompanied him 

 on his rambles over the foot-hills." Specimens taken by J. H. Batty 

 for the Hon. Walter Rothschild are recorded by Thomas (1903a, 

 p. 39) from Sevilla and Almijas, small islands near the southwestern 

 coast of the republic. Examples obtained by the same collector at 

 Boqueron were sent to the American Museum of Natural History, 

 and included by Allen (1904, p. 80) in his annotated list of species. 

 The animal is, so far as known, limited to western Panama. Another 

 form, described by Thomas (1904, p. 250) as " Saimiri oerstedi 

 citrinellus " with " head less blackened, and the limbs less yellow " 

 inhabits adjacent parts of Costa Rica. 



Specimens examined : Boqueron, 59 l ; Bugaba, 5/ 



Family AOTIDAE. Night Monkeys 



Among the monkeys of the region this aberrant family is char- 

 acterized by nocturnal habits. The pelage is woolly, and in general 

 appearance the members of the group are very unlike the other 

 American monkeys ; they bear a striking resemblance to some of the 

 lemurs of the Old World. 



Genus AOTUS Humboldt 

 The monkeys of the genus Aotus have very large and prominent 

 eyes, which are doubtless correlated with their nocturnal habits. 

 The face is marked by white frontal stripes, separated by a black 

 median stripe. The tail is non-prehensile, and terminates in a small 

 brush. One species is known from Panama. 



1 Collection Amer. Mus. Nat. Hist. 



2 Collection Mus. Comp. Zool. 



