About the coffee plantations, and indeed throughout the rural portions of the country, there is a curious little insect called a cocuyo, answering in its general characteristics and nature to our firefly, though it is quadruple its size, and far the most brilliant insect of its kind known to naturalists. They float in phosphorescent clouds over the vegetation, emitting a lurid halo, like fairy torch-bearers to elfin crews. One at first sight is apt to compare them to a shower of stars. They come in multitudes immediately after the wet season sets in, prevailing more or less, however, all the year round. Their advent is always hailed with delight by the slave children, as well as by children of a larger growth. They are caught by the slaves in any desired numbers and confined in tiny cages of wicker, giving them sufficient light in their cabins at night for ordinary purposes, and forming the only artificial light permitted them. We have seen a string of the little cages containing the glittering insects hung in a slave-cabin in festoons, like colored lamps in fancy-goods stores in America. The effect of the evanescent light thus produced is very peculiar, but the number of insects employed insures a sufficiently steady effect for ordinary purposes. These little creatures are brought into Havana by young Creole children and by women, for sale to the ladies, who sometimes in the evenings wear a small cage hung to the wrist containing a few of the cocuyos, and the light thus produced is nearly equal to a small candle. Some ladies wear a belt of them at night, ingeniously fastened about the waist, others a necklace, and the effect is highly amusing. In the ballroom they are worn in the flounces of ladies' dresses, where they glisten very much like diamonds and other precious stones. Strange to say, there is a natural hook near the head of the firefly, by which it can be attached to the dress without apparent injury to it. The town ladies keep little cages of these insects as pets, feeding them on sugar, of which they appear to be immoderately fond. On the plantations, when a fresh supply is desired, one has only to wait until evening, when hundreds can be secured with a thread net at the end of a pole. By holding a cocuyo up in the out-door air for a few moments, large numbers are at once attracted to the spot. In size they are about an inch long, and a little over an eighth of an inch in breadth.