NATIONAL ZOOLOGICAL PARK HOLLISTER. 557 



house are the mona (Lasiopyga mona), the vervet (L. pygerytkra) , 

 the green monkey (L. callitriehus) , and the roloway (L. roloway), 

 the latter an especially beautiful form with glossy, blackish coat and 

 a long, white beard. The patas monkeys {Erythrocebus patas) are 

 near relatives of the guenons but are larger animals, more at home 

 on the open country than in the forests. The general coloration 

 is red. 



Baboons shown, in addition to the chacma, mentioned above, are 

 the Guinea baboon (Papio papio), a small tawny species of West 

 Africa; the yellow baboon (P. cynocephalus) of northern Africa; 

 the Hamadryas baboon (P. hamadryas), a large, powerful Abys- 

 sinian species which lives in herds of up to 300 in number in the 

 rocky, waste country; the mandrill (P. sphinx), a West African 

 species with an enormous head and long snout; and the drill (P. 

 leucophceus) of Cameroon. 



AMERICAN MONKEYS. 



The American monkeys and marmosets are of great variety and 

 are found throughout most of tropical America, north into Mexico. 

 In parts of equatorial South America many species occur in the 

 heavily forested river valleys. They are, unfortunately, much more 

 difficult to keep in captivity than are most of the Old World monkeys, 

 and only a few species are successfully maintained in zoological 

 gardens. The capuchins, the exception to -the rule, are the com- 

 monest hand-organ monkeys and are familiar to all. Two species 

 of these are regularly shown, the white-throated capuchin (Cebus 

 capucinus) and the brown capuchin (G. fatuellus). Geographical 

 races of the first range northward into Nicaragua. 



The spider monkeys are remarkable for the highly developed 

 prehensile tail, which is constantly used as a fifth hand. They are 

 among the most perfectly arboreal of mammals and exhibit the 

 greatest agility in their movements throughout the tree tops. Nu- 

 merous species are known and the range of the genus extends north- 

 ward well into Mexico. The species most commonly exhibited in the 

 park is the gray spider monkey (Ateles geofroyi). Various species 

 of squirrel monkeys and marmosets are shown from time to time. 



• 



THE LEMURS. 



Although several groups of lemurs are known from Africa and 

 the oriental region, the species included within the typical genus 

 Lemur, and known as "true lemurs," are confined to Madagascar 

 and neighboring islands. They have a foxlike face and muzzle and 

 a long tail. The numerous species are essentially arboreal and many 



