NATIONAL ZOOLOGICAL PARK HOLLISTER 305 



mangabey (C. aterrimus) ; Hagenbeck's mangabey (C. hagenbecki) ; 

 and the white-collared species {G. torquatus). 



The guenons form the largest group of the Primates and exhibit 

 remarkable diversity in coloration and color pattern. They are 

 attractive and very interesting monkeys with slender bodies and 

 long limbs and tails. Some of the species are oddly and brilliantly 

 colored. The group includes about 80 forms and is native to Africa ; 

 but two species (the mona and the green guenon) have been intro- 

 duced into the West Indies and are perfectly established on some 

 of the islands. Attractive species of this genus shown in the monkey 

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

 the green monkey (L. callitrichus) , 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 

 yellow baboon (Papio cynocephalus) of northern Africa; the Hama- 

 dryas baboon (P. hamadryas) , a large, powerful Abyssinian 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. An albino specimen of the East African baboon (P. 

 ibeanvs) attracts great attention. It was purchased in Mombasa in 

 1914 by Mr. H. N. Sclater, who presented it to the park. 



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 

 commonest hand-organ monkeys and are familiar to all. Three 

 species of these are regularly shown, the white-throated capuchin 

 {Cebus capucinus), the brown capuchin (O. fatuellus), and the 

 weeping capuchin (C apella). Geographical races of the first range 

 northward into Nicaragua. Among the many rare and unusual ani- 

 mals collected by the Mulford Biological Explorations of the Ama- 

 zon Basin, and presented to the park in 1922, are two additional 

 species, the pale capuchin (C. unicolor) and Azara's capuchin (C. 

 azaros), both from Bolivia. 



