NO. 5 MAMMALS OF PANAMA — GOLDMAN 223 



size. They are easily distinguished from the Callitrichidae, another 

 group of small, squirrel-like species, by the short, instead of much 

 elongated pelage, especially of the nape and sides, and the absence 

 of a narrow and conspicuous median frontal crest. 



Genus SAIMIRI Voigt. Titi Monkeys 



The members of the genus Saimiri are similar in size to those of 

 the genus Leontocebus, family Callitrichidae, which also inhabits the 

 general region ; but they differ widely in more essential respects. 

 The general pelage is rather short, harsh and of nearly uniform 

 length, instead of being long and soft, with an elongated mane or 

 mantle covering the nape and overhanging the sides as in Leontoce- 

 bus; and the short hairs of the face pass rather gradually into the 

 pelage covering the top of the head, there being no narrow, con- 

 spicuous median crest as in the latter genus. The long tail is hairy 

 to the tip. 



SAIMIRI ORSTEDII ORSTEDII (Reinhardt) 



Orsted's Titi Monkey 



Chrysothrix orstcdii Reinhardt, Vidensk. Middel. Nat. For. Kjobenhavn, 

 1872, p. 157. Type from Chiriqui, Panama. 



Orsted's titi monkey is externally recognizable by its squirrel-like 

 size together with the white face, sides of neck, throat and chest 

 which contrast strongly with the black crown. The back, hands and 

 feet are rusty reddish. 



The species was named for the Danish traveller Andreas Sandp'e 

 Orsted, who secured a specimen in Chiriqui many years ago. A 

 skeleton of an animal probably of this species was provisionally 

 referred by Sclater (1856, p. 139) to Saimiris sciurea (Linnaeus). 

 It was collected by Thomas Bridges in the forest near David. Sclater 

 later (1872, p. 3) assigned the same material to Saimiris entomo- 

 phaga (D'Orbigny) with the remarks: "In 1856 I recorded the 

 existence of a species of Squirrel Monkey in Central America, 

 Mr. Bridges having procured, near David in Veragua, a skeleton of 



a species of this genus I have no doubt that the Central 



American form is the black-headed 6". entomophaga, as there is a skin 

 of this species in the British Museum from Veragua (Arce)." 

 Alston (1879, p. 16) also mentions the Bridges specimen and ex- 

 amples sent from Chiriqui by Enrique Arce. 



Recent collectors have met with the animal at various localities in 

 western Panama. Bangs (1902, p. 51) lists five specimens collected 



15 



