To check the ravages of the coffee bug[4231] (Lecanium coffeæ, Walker), which for some years past has devastated some of the plantations in Ceylon, the experiment was made of introducing the red ants, who feed greedily on the Coccus. But the remedy threatened to be attended with some inconvenience, for the Malabar Coolies, with bare and oiled skins, were so frequently and fiercely assaulted by the ants as to endanger their stay on the estates.
The ants which burrow in the ground in Ceylon are generally, but not invariably, black, and some of them are of considerable size. One species, about the third of an inch in length, is abundant in the hills, and especially about the roots of trees, where they pile up the earth in circular heaps round the entrance to their nests, and in doing this I have observed a singular illustration of their instinct. To carry up each particle of sand by itself would be an endless waste of labour, and to carry two or more loose ones securely would be to them embarrassing, if not impossible. To overcome the difficulty they glue together with their saliva so much earth or sand as is sufficient for a burden, and each ant may be seen hurrying up from below with his load, carrying it to the top of the circular heap outside, and throwing it over, the mass being so strongly attached as to roll to the bottom without breaking asunder.
The ants I have been here describing are inoffensive, differing in this particular from the Dimiya and another of similar size and ferocity, which is called by the Singhalese Kaddiya. They have a legend illustrative of their alarm for the bites of the latter, to the effect that the cobra de capello invested the Kaddiya with her own venom in admiration of the singular courage displayed by these little creatures.[4241]
LEPIDOPTERA. Butterflies.—In the interior of the island butterflies are comparatively rare, and, contrary to the ordinary belief, they are seldom to be seen in the sunshine. They frequent the neighbourhood of the jungle, and especially the vicinity of the rivers and waterfalls, living mainly in the shade of the moist foliage, and returning to it in haste after the shortest flights, as if their slender bodies were speedily dried up and exhausted by exposure to the intense heat.
Among the largest and most gaudy of the Ceylon Lepidoptera is the great black and yellow butterfly (Ornithoptera darsius, Gray); the upper wings of which measure six inches across, and are of deep velvet black, the lower ornamented by large particles of satiny yellow, through which the sunlight passes. Few insects can compare with it in beauty, as it hovers over the flowers of the heliotrope, which furnish the favourite food of the perfect fly, although the caterpillar feeds on the aristolochia and the betel leaf, and suspends its chrysalis from its drooping tendrils.
Next in size as to expanse of wing, though often exceeding it in breadth, is the black and blue Papilio Polymnestor, which darts rapidly through the air, alighting on the ruddy flowers of the hibiscus, or the dark green foliage of the citrus, on which it deposits its eggs. The larvæ of this species are green with white bands, and have a hump on the fourth or fifth segment. From this hump the caterpillar, on being irritated, protrudes a singular horn of an orange colour, bifurcate at the extremity, and covered with a pungent mucilaginous secretion. This is evidently intended as a weapon of defence against the attack of the ichneumon flies, that deposit their eggs in its soft body, for when the grub is pricked, either by the ovipositor of the ichneumon, or by any other sharp instrument, the horn is at once protruded, and struck upon the offending object with unerring aim.
Amongst the more common of the larger butterflies is the P. Hector, with gorgeous crimson spots set in the black velvet of the inferior wings; these, when fresh, are shot with a purple blush, equalling in splendour the azure of the European "Emperor."
The Spectre Butterfly.—Another butterfly, but belonging to a widely different group, is the "sylph" (Hestia Jasonia), called by the Europeans by the various names of Floater, Spectre, and Silver-paper fly, as indicative of its graceful flight. It is found only in the deep shade of the damp forest, usually frequenting the vicinity of pools of water and cascades, about which it sails heedless of the spray, the moisture of which may even be beneficial in preserving the elasticity of its thin and delicate wings, that bend and undulate in the act of flight.
The Lycanidæ[4261], a particularly attractive group, abound near the enclosures of cultivated grounds, and amongst the low shrubs edging the patenas, flitting from flower to flower, inspecting each in turn, as if attracted by their beauty, in the full blaze of sun-light; and shunning exposure less sedulously than the other diurnals. Some of the more robust kinds[4262] are magnificent in the bright light, from the splendour of their metallic blues and glowing purples, but they yield in elegance of form and variety to their tinier and more delicately-coloured congeners.