On human beings its bite is generally fatal. Bates mentions several instances of death from it, and only one clear case of recovery,--but in that instance the person was lame for life. Although most other serpents fly from man, the jararaca frequently attacks him; leaping from its concealment among the leaves, and inflicting a wound which in a few hours produces death. The first symptoms caused by the poison are convulsions, pains at the heart, and distressing nausea, the whole nervous system appearing to be greatly affected. The only known remedy is the copious use of spirits, a large amount of which is required to counteract the enervating power of the poison. The jararaca is generally six feet long, but sometimes reaches the length of eight feet. It is marked with dark cross bands, while below it is of a whitish-grey hue, covered with small dark spots. Even birds seem to have a slight dread of this fearful serpent, and may be seen hovering about the spot where it lies coiled up, uttering cries and screams, produced by fear and anger. THE BUSHMASTER. Almost as much dreaded as the jararaca is the enormous cuanacouchi (Lachesis mutus), or bushmaster, as it is called in Demerara. Its proper name is the curucucu. It sometimes reaches to a length of fourteen feet, being the largest known poisonous snake. It is equally remarkable for the glowing radiance of its fearful beauty, displaying as it does, when gliding amid the sunshine, all the prismatic colours. Though generally remaining on the ground, it mounts trees with perfect ease in search of its prey--birds or their eggs; while from the overhanging bough it can dart down on the unwary passer-by. It is said that furious battles sometimes occur between snakes of different species,--that the boa will watch for the rattlesnake as it issues from its hole,--or that the latter will sally forth, and, relying on its envenomed fangs for victory, attack the huge boa as it glides by; though, as no naturalists appear to have witnessed such combats, it may be doubted whether they ever take place. But we may fancy how desperate would be the strife between a python and the venomous bushmaster of Demerara. LABARRI, OR ELAPS LEMNISCATUS. The labarri--another beautiful snake, adorned with the colours of the rainbow--produces certain death by its envenomed bite. It, too, is a tree-climber, and may be seen lying coiled up on a low, thick branch or decayed stump, or sometimes on the bare ground, apparently selecting spots where it can be least easily distinguished. Though generally smaller than the bushmaster, it attains a length of eight feet or more. WHIP SNAKES.