The Sapajous are the hardiest, the most intelligent and in some respects the most interesting of the New World monkeys. They all possess the prehensile (or grasping) tail, _which is not found on any Old World monkey_, and the use made of it is a constant source of wonder. Monkeys of this species are quite common in captivity, and their wrinkled brows and serious countenances give them an appearance of being burdened with cares,—which most captive monkeys certainly are! These are the unfortunate creatures which so often come to grief on hand-organs. The Black Spider Monkey and the Gray Spider Monkey represent a genus of animals quite as attenuated in form as the gibbons. Their slender bodies, exceedingly long and slender legs and tail,—the latter strongly prehensile, and better than a fifth arm and hand,—give them when in the tree-tops an appearance truly spider-like. They are agile climbers, but not rapid runners, and having no means of defense are very timid. Their stomachs are so simple they seem to lack some element or function that is necessary to the life of the animal in captivity. Notwithstanding the fact that “Jess,” of Bath, New York, in defiance of all laws and precedents, _lived thirteen years in a cold climate_, the great majority of spider monkeys die before they reach full maturity, and nearly always of stomach troubles. Fortunately, however, there are exceptions to this rule. [Illustration: JAPANESE RED-FACED MONKEY.] [Illustration: PIG-TAILED MACAQUE.] The Squirrel Monkey, often called a “Marmoset,” is a pretty little olive-yellow monkey, almost as delicate as the true Marmoset, and the Pinche. These diminutive creatures are so delicate they require the greatest care and tenderness, and thrive better in moderately small cages than in large ones. True marmosets are the smallest of American primates, being next in size to the Tarsier, of Borneo, smallest of all quadrumanes. The Lemurs and Lemuroids.—A lemur is a monkey-like animal belonging to the lowest group of primates, but in some respects is so little like a typical monkey that the relationship is not always apparent. There are about thirty species, and all save a very few are found on the Island of Madagascar. They are gentle-spirited, harmless and inoffensive animals, and not being persecuted by their human neighbors, as all American wild animals are, they are quite numerous. Nearly all the Lemurs have long tails, long and fine hair, large eyes and pointed muzzles. Many of them are strikingly colored in various shades of black, white and gray. All Lemurs are supposed to be of nocturnal habit, and in fact they really are; but the specimens in the large jungle cage of the Primate House are quite as lively and interesting in the daytime as most of the monkeys. So far from manifesting a disposition to retire to dark corners, they love to lie in the sunshine. [Illustration: SLOW LEMUR.] [Illustration: SIAMANG.]