DISTRIBUTION.--This species, also spoken of as the Mexican Spider-Monkey, is known to occur right across Guatemala; it is by no means uncommon, Mr. Salvin says, in the forest country on the northern part of Vera Paz, and he also saw a troop at the summit of the ridge of mountains which connects the Volcan de Fuego with the main Cordillera, at about 8,000 feet above the sea. The late Prof. Liebmann, the Danish botanist, obtained a specimen, according to Prof. Reinhardt, "in the neighbourhood of the small place Mirador, situated not far from the volcano of Orizaba, in the State of Vera Cruz.... He met with it also in the eastern parts of the State of Oaxaca.... But at the same time he expressly states that he never met with this _Ateles_, nor, indeed, with any other Monkey, on the Pacific slope of the Great Cordillera in Oaxaca, and that, as far as he could learn, Monkeys are to be found on the western coast only south of Tehuantepec." This species is the only Spider-Monkey certainly known to range as far north as Mexico. According to M. Sallé, the most northern locality for Monkeys with which he was acquainted, was in the State of San-Louis Potosi, about 23° N. latitude, on the upper part of the basin of the Tampico river. (_Alston._) HABITS.--The Mexican Spider-Monkey is, like the foregoing members of the genus, arboreal, consorting together in small troops, and feeding on fruits. Prof. Liebmann observed it in small troops in the deep barrancas, up to an elevation of 2,000 {246}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 querulous 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.