While our indigenous ants cause a disagreeable burning on the skin, by the secretion of a corrosive acid peculiar to the race, the sting or bite of many tropical species causes the most excruciating tortures. ‘I have no words,’ says Schomburgk, ‘to describe the pain inflicted upon me by the mandibles of the Ponera clavata, a large, and, fortunately, not very common ant, whose long black body is beset with single hairs. Like an electric shock the pain instantly shot through my whole body, and soon after acquired the greatest intensity in the breast, and over and under the armpits. After a few minutes I felt almost completely paralysed, so that I could only with the greatest difficulty, and under the most excruciating tortures, totter towards the plantation, which, however, it was impossible for me to reach. I was found senseless on the ground, and the following day a violent wound fever ensued.’ ‘Having, while in Angola, accidentally stepped upon a nest of red ants,’ says Livingstone, ‘not an instant seemed to elapse before a simultaneous attack was made on various unprotected parts, up the trousers from below, and on my neck and breast above. The bites of these furies were like sparks of fire, and there was no retreat. I jumped about for a second or two, then in desperation tore off all my clothing, and rubbed and picked them off seriatim as quickly as possible! Fortunately, no one observed this rencontre, or word might have been taken back to the village that I had become mad. It is really astonishing how such small bodies can contain so large an amount of ill nature. They not only bite, but twist themselves round after the mandibles are inserted, to produce laceration and pain more than would be effected by the single wound. Frequently, while sitting on the ox, as he happened to tread near a band, they would rush up his legs to the rider, and soon let him know that he had disturbed their march. They possess no fear, attacking with equal ferocity the largest as well as the smallest animals. When any person has leaped over the band, numbers of them leave the ranks and rush along the path, seemingly anxious for a fight.’ But however formidable the weapons of the ants may be, yet the injuries they inflict upon the property of man, pouring over his plantations like a flood, and sweeping away the fruits of his labours, are of a much more lasting and serious nature than their painful bite or venomous sting. In the West Indies, the brown-black Viviagua, about one-third of an inch long, and with a prickly thorax, is the greatest enemy of the coffee plantations. In one day it will rob a full-grown tree of all its leaves. It digs deep subterranean passages of considerable dimensions and irregular forms, with a great number of hand-high galleries branching out from the sides, and does even more harm to the coffee-plants by its mining operations than by robbing them of their foliage.