Grasshoppers, which it will snap up with eagerness when within reach. The expression of countenance in these small Monkeys is intelligent and pleasing. This is partly owing to the open facial angle which is given as one of 60°; but the quick movements of the head, and the way they have of inclining it on one side when their curiosity is excited, contribute very much to give them a knowing expression. Anatomists who have dissected species of Midas tell us that the brain is of a very low type, from there being few convolutions, the surface being as smooth as that of a Squirrel’s. I should conclude, at once, that this character is an unsafe guide in judging on the mental qualities of these animals. In mobility of expression of countenance, intelligence, and general manners, these small Monkeys resemble the higher Apes far more than they do any rodent animal with which I am acquainted. On the Upper Amazon I once saw a tame individual of the _Midas leoninus_, a species first described by Humboldt, which was still more playful and intelligent than the one just described. This rare and beautiful little Monkey is only seven inches in length, exclusive of the tail. It is named _leoninus_ on account of the long brown mane which depends from the neck, and which gives it very much the appearance of a diminutive Lion. In the house where it was kept it was familiar with every one; its greatest pleasure seemed to be to climb about the bodies of different persons who entered. The first time I went in it ran across the room straightway to the chair on which I sat down, and climbed up to my shoulder. Arrived there it turned round and looked into my face, showing its little teeth, and chattering, as though it would say, ‘Well, and how do you do?’ It showed more affection towards its master than towards strangers, and would climb up to his head a dozen times in the course of an hour, making a great show every time of searching there for certain animalculæ. Isidore Geoffroy St. Hilaire relates of a species of this genus, that it distinguished between different objects depicted on an engraving. M. Audouin showed it the portraits of a Cat and a Wasp. At these it became much terrified; whereas, at the sight of a figure of a Grasshopper or Beetle, it precipitated itself on the picture, as if to seize the objects there represented.“ MIDAS ARGENTATUM.