246 ALLEN'S NATURALIST'S LIBRARY. 



feet above the sea, on the Orizaba volcano, and in the forests of 

 Oaxaca, to 4,000 feet. Mr. Salvin, on the volcano of Atitlan, in 

 Guatemala, at a height of between 5,000 and 6,000 feet, met 

 several troops of this species on the tops of the higher trees 

 of the forest. These parties of Monkeys were usually about 

 twenty in number and of all ages. On approaching them they 

 did not evince any alarm, but kept uttering a constant queru- 

 lous sort of bark, and moved from time to time so as to get a 

 better view of the intruder. A few days afterwards, during 

 an excursion to the same volcano, when the summit, 11,800 

 feet above the sea, was reached, numerous troops of Ateles were 

 seen in the forest, from an elevation of 7,000 feet to as low as 

 2,500 feet on the outskirts of the coffee plantations of San 

 Agustin. 



Now that we have passed in review the whole of the Anthro- 

 poid species inhabiting the New World, a short account of the 

 regions to which they are confined will be of some interest. 

 The most northern limit of Monkeys is, as mentioned above, 

 the State of San-Louis Potosi, about the latitude of 23 North. 

 Their most southern limit attains to nearly 25 of South lati- 

 tude. They are now confined to the Mexican and Brazilian 

 sub-regions of what has been defined as the Neotropical 

 Region, by Dr. A. R. Wallace, in his great work, " The Geo- 

 graphical Distribution of Animals." The Mexican sub-region 

 belongs to the Neotropical Region, one of those six great 

 areas into which the globe has been divided off by Dr. Sclater 

 on the basis of the geographical distribution of the animals 

 that now inhabit it the final product of the slowly-changing 

 features of the earth's surface, and of the form, structure, and 

 habits of its animal and vegetable life. 



The Mexican sub-region forms the northern part of the Re- 



