The Confessions of a Beachcomber

by E. J. Banfield

In some respects this insect resembles the MANTIS RELIGIOSA; but it does not seem to possess the voracious appetite of that insect, which assumes the supplicatory attitude that it may the more readily seize its prey. Indeed, although two specimens were under observation for three months, at morning, noon and eve, I only once saw one eating, and then it was partaking sparingly of orange leaves. The insect is well-known as a vegetarian, but the manner of its feeding is singular. The part that it takes of a motionless snake would be ineffective if the head moved while eating, and Nature provides against any blundering of that sort. The edge of a leaf is guided to the mouth, which appears to open vertically—not horizontally as mouths usually do—by a set of palpi or feelers, three on each side. The palpi move the leaf along, the while a crescent-shaped strip is rapidly nibbled away. Then they move the leaf back again to the original starting point, and another crescent is devoured, and so on, while the extended anterior legs, hooked on to a twig, pull the body forward with a gliding, almost imperceptible motion as the leaf is gradually consumed. Between meals, the palpi are folded flat close to the mouth, like the blades of a pocket-knife.

Blacks classify most of the works of Nature under two headings—"Good to eat," "Not good to eat," and nearly everything is included under the former. The "Taloo" or "Yam-boo" is included in the larger class. Ruthlessly deprived of its limbs, the insect is placed squirming on hot embers until it becomes crisp, when it is eaten with great relish.

GREEN-ANT CORDIAL

White ants, black ants, red ants, brown ants, grey ants, green ants; ants large, ants small; ants slothful, ants brisk; meat-eating ants, grain-eating ants, fruit-eating ants, nectar-imbibing ants; ants that fight, ants that run away; ants that live under coldest stone, ants that dwell among the treetops; silent ants, ants that literally "kick up" a row; good ants, bad ants, ants that are merely so so—we have them all and would not part with any—not even the stinging green ants, which are among the most singular of the tribe, nor even the "white ant" (which is not an ant), that would literally eat us out of house and home if not rigorously excluded and warred against with poison, for they are the great scavengers of woodeny debris.

Green ants do disfigure orange and mango trees with their "nests," and they have the temper of furies; but they wage war on many of the insects which bother plants, and clear away insect carrion, and carrion, in fact, of all sorts. This ant, to which has been given the official title of "emerald-coloured leaf dweller," constructs a pocket with leaves of living trees (and, very rarely, of the blades of living grass), and dwelling therein establishes populous colonies. The queen or mother ant sets up her separate establishment by curling a small leaf or the corner of a large one, joining the edges with a white cottony fabric, and forthwith begins to raise a family. She is a portly creature—unlike her slim, semi-transparent workers and warriors—and most prolific, and her family increases marvellously. As it multiplies, ingenious additions of living leaves are made to the pocket or purse, until it may assume the size of a football and be the home of millions of alert, pugnacious, inquisitive, foraging insects, whose bites are dreaded by individuals whose skin is extra sensitive.

Is it not astonishing that insects, possessing even in combination such trivial muscular power as the green tree-ant, should be able to cause leaves 12 inches long by 8 inches wide to curl up so that the apex shall almost touch the base, or that the parallel borders shall be brought together with the nicest apposition? The astonishment increases when it is recognised that at the founding of a colony there are but few workers to co-operate in the undertaking.

The minute caterpillar of a certain species of moth mines leaves, and eating away the cellular structures, causes them to twist irregularly, and eventually spins on the spot a cocoon of green silk in which it undergoes metamorphosis. A local caterpillar, too, converts the tough harsh leaves of a fig-tree (FICUS FASCICULATA) into a close and perfect scroll by an elaborate system of haulage, spinning silken strands as required, having primarily rendered the leaf the more easy to manipulate by nibbling away a portion of the midrib. In this scroll the insect dozes until in process of time it is transformed, and emerges a bright but short-lived butterfly.

But, as far as my personal observation goes, the green tree-ants do not effect any alteration in the superficial appearance nor destroy the structure of leaves, nor employ any physical power at the first stages of the construction of a habitation. The process by which a leaf is curled extends over several days, and but few take part in it. Half a dozen ants may be seen perpetually engaged in, apparently, an unmethodical but extremely minute and critical inspection of the rhachis and the nerves or ribs of the leaf. Days pass. The ants are there all the time, examining the leaf and communicating with each other whensoever they meet. Imperceptibly the leaf begins to curl. The ants continue to make mesmeric passes over the nerves with ever-waving antennae.

In accordance with the will and the design of the architects, who merely stand by and gesticulate, the opposite margins approach, or the apex curls towards the base, or towards one of the sides to form a miniature funnel. When the extremities are so close that the intervening space may be spanned, threads of white gossamer are laced across, and the slack being taken up by degrees, in a few days a cosy pocket with closely-fitting seams is completed.

How is this folding of the leaf accomplished? A theory which presents itself is that the ants eject some active chemical principle into certain of the cells of the leaf tissue, and that the stimulus is transmitted by excitation from cell to cell, bringing about a general and uniform contraction without destroying the vitality of the leaf. Further, by the application of the injection to specific cells the ants convey impulses to specific nerves, causing the leaf to curl longitudinally or laterally, or at any angle they design. The poison that a single ant injects into the neck of a brawny man so affects his nervous system that he twists and writhes and stamps his feet with energy sufficient to destroy millions of the species. Maybe a slightly different compound is reserved for vegetable substances, which can offer only a flabby sort of remonstrance. If this theory be supported on investigation, surely the green tree-ant will deserve to be catalogued among creatures who have solved labour-saving problems—who employ consciousness, if not rational thought, to compensate for physical frailty. This theory is applicable to the manipulation of a single leaf only, and of a leaf of considerable size. Yet these feeble folk more frequently take up their quarters in trees bearing small leaves, of which scores are embodied in a mansion. Immense and concentrated exertion is necessary to draw far-flung branchlets and leaves together, and the feverish host accomplishes a seemingly impossible feat by an organised combination of engineering with co-operative labour. Spaces between leaves and twigs four and five inches wide are bridged by chains of ants—each individual clasping with its mandibles above the abdominal segment its immediate companion; occasionally the ant grips its fellow by the posterior legs, and is so held by the next in order. In the construction of these chains ants hastily mass at each side of the gulf to be spanned, and crawling, or rather running over each other, form pendant strands, each ant a living link. The chains sway until the terminal links engage, when they are immediately shortened up. Several of these chains are swung across parallel to each other with astonishing rapidity; and in addition to the constant strain of the hauling workers at each end they are used as bridges by innumerable other workers and fussy superintendents, the traffic on them being almost as voluminous and bustling as that of a Thames thoroughfare. Gradually the most obstinate branchlet with its spray of leaves is drawn into juxtaposition with the main part of the mansion. Then the living spans become more numerous, presenting the appearance of great stitches. As the edges of the leaves are brought together they are fastened with white gossamer while the tireless workers strain themselves, heroically holding the edges in apposition. The gossamer seems to be obtained in part from the pupuae, which, borne in the mandibles of workers, are passed to and fro as weavers' shuttles. As a rule, insects which house themselves in leaves are vegetarian, but the green ant is demonstratively carnivorous, using leaves solely for shelter.