CURIOSITIES RESPECTING INSECTS.—(Continued.)

The Wasp.

For the following account of the Wasp, we are indebted to Kirby and Spence; and we take this opportunity of making a general acknowledgment of our obligations to those gentlemen, for the assistance we have derived from their highly interesting treatise, in drawing up this account of the curiosities respecting insects.

Compared with hive-bees, wasps may be considered as a horde of thieves and brigands: while the bees are peaceful, honest, and industrious subjects; the wasps attack their persons, and plunder their property. Yet, with all this love of pillage and other bad propensities, they are not altogether disagreeable or unamiable; they are brisk and lively; they do not usually attack unprovoked; and their object in plundering us is not purely selfish, but is principally to provide for the support of the young brood of their colonies.

The societies of wasps, like those of ants, and other social Hymenoptera, consist of females, males, and workers. The females may be considered as of two sorts: first, the females, by way of eminence, are much larger than any other individuals of the community; they equal six of the workers (from which in other respects they do not materially differ) in weight, and lay both male and female eggs: then the small females, not larger than the workers, which lay only male eggs. This last description of females, which are found also both amongst the humble-bees and hive-bees, were first observed among wasps, by M. Perrot, a friend of Huber’s. The large females are produced later than the workers, and make their appearance in the next spring; and whoever then destroys one of them, destroys an entire colony, of which she would be the founder.

Different from the queen-bee, the female wasp is at first an insulated being, that has had the fortune to survive the rigours of winter. When in the spring she lays the foundation of her future empire, she has not a single worker at her disposal; with her own hands and teeth she often hollows out a cave wherein she may lay the first foundations of her paper metropolis: she must herself build the first houses, and produce from her own body their first inhabitants; which in their infant state she must feed and educate, before they can assist her in her great design. At length she receives the reward of her perseverance and labour; and from being a solitary unconnected individual, in the autumn is enabled to rival the queen of the hive in the number of her children and subjects, and in the edifices which they inhabit—the number of cells in a vespiary sometimes amounting to more than sixteen thousand, almost all of which contain either an egg, a grub, or a pupa, and each cell serving for three generations in a year; which, after making every allowance for failures and other casualties, will give a population of at least thirty thousand. Even at this time, when she has so numerous an army of coadjutors, the industry of this creature does not cease, but she continues to set an example of diligence to the rest of the community. If by any accident, before the other females are hatched, the queen-mother perishes, the neuters cease their labours, lose their instincts, and die.

The number of females in a populous vespiary is considerable, amounting to several hundreds; they emerge from the pupa about the latter end of August, at the same time with the males, and fly in September and October, when they pair. Of this large number of females, very few survive the winter. Those that are so fortunate, remain torpid till the vernal sun recalls them to life and action. They then fly forth, collect provision for their young brood, and are engaged in the other labours necessary for laying the foundation of their empire; but in the summer months they are never seen out of the nest.

The male wasps are much smaller than the female, but they weigh as much as two workers. Their antennÆ are longer than those of either, not, like theirs, thicker at the end, but perfectly filiform; and their abdomen is distinguished by an additional segment. Their numbers about equal those of the females, and they are produced at the same time. They are not so wholly given to pleasure and idleness as the drones of the hive. They do not, indeed, assist in building the nest, and in the care of the young brood; but they are the scavengers of the community, for they sweep the passages and streets, and carry off all the filth. They also remove the bodies of the dead, which are sometimes heavy burdens for them; in which case two unite their strength, to accomplish the work; or, if a partner be not at hand, the wasp thus employed cuts off the head of the defunct, and so effects its purpose. As they make themselves so useful, they are not, like the male bees, devoted by the workers to an universal massacre when the great end of their creation is answered; but they share the general lot of the community, and are suffered to survive till the cold cuts off them and the workers together.

The workers are the most numerous, and to us the only troublesome part of the community; upon whom devolves the main business of the nest. In the summer and autumnal months they go forth by myriads into the neighbouring country to collect provisions; and on their return to the common den, after reserving a sufficiency for the nutriment of the young brood, they divide the spoil with great impartiality; part being given to the females, part to the males, and part to those workers that have been engaged in extending and fortifying the vespiary. This division is voluntarily made, without the slightest symptom of compulsion. Several wasps assemble round each of the returning workers, and receive their respective portions. It is curious and interesting to observe their motions on this occasion. As soon as a wasp that has been filling itself with the juice of fruits arrives at the nest, it perches upon the top, and, disgorging a drop of its saccharine fluid, is attended sometimes by two at once, who share the treasure; this being thus distributed, a second, and sometimes a third drop, is produced, which falls to the lot of others.

Wasps, though ferocious and cruel towards their fellow-insects, are civilized and polished in their intercourse with each other, and form a community whose architectural labours will not suffer on comparison even with those of the peaceful inhabitants of a bee-hive. Like these, the great object of their industry is the erection of a structure for their beloved progeny, towards which they discover the greatest affection and tenderness, and, like bees, construct combs consisting of hexagonal cells for their reception; but the substance which they make use of is very dissimilar to the wax employed by bees, and the general plan of their city differs in many respects from that of a bee-hive. The common wasp’s nest, usually situated in a cavity under ground, is of an oval figure, about sixteen or eighteen inches long, by twelve or thirteen broad. Externally, it is surrounded by a thick coating of numerous leaves of a sort of grayish paper, which do not touch each other, but have a small interval between each, so that if the rain should chance to penetrate one or two of them, its progress is speedily arrested. On removing this external covering, we perceive that the interior consists of from twelve to sixteen circular combs of different sizes, not ranged vertically, as in a bee-hive, but horizontally, so as to form so many distinct and parallel stories. Each comb is composed of a numerous assembiage of hexagonal cells, formed of the same paper-like substance as the exterior covering of the nest, and, according to a discovery of Dr. Barclay, each, as in those of bees, a distinct cell, the partition walls being double.—Memoirs of the Wernerian Society, ii. 260. These cells, which, as wasps do not store up any food, serve merely as the habitations of their young, are not, like those of the honey-bee, arranged in two opposite layers, but in one only, their entrance being always downwards: consequently the upper part of the comb, composed of the bases of the cells, which are not pyramidal, but slightly convex, forms a nearly level floor, on which the inhabitants can conveniently pass and repass, spaces of about half an inch high being left between each comb. Although the combs are fixed to the sides of the nest, they would not be sufficiently strong without further support. The ingenious builders, therefore, connect each comb to that below it by a number of strong cylindrical columns or pillars, having, according to the rules of architecture, their base and capital wider than the shaft, and composed of the same paper-like material used in other parts of the nest, but of a more compact substance. The middle combs are connected by a rustic colonnade of from forty to fifty of these pillars; the upper and lower combs by a smaller number.

The cells are of different sizes, corresponding to that of the three orders of individuals which compose the community; the largest for the grubs of females, the smallest for those of workers. The last always occupy an entire comb, while the cells of the males and females are often intermixed. Besides openings which are left between the walls of the combs to admit of access from one to the other, there are at the bottom of each nest two holes, by one of which the wasps uniformly enter, and through the other issue from the nest, and thus avoid all confusion or interruption of their common labours. As the nest is often a foot and a half under ground, it is requisite that a covered way should lead to its entrance. This is excavated by the wasps, who are excellent miners, and is often very long and tortuous, forming a beaten road to the subterranean city, well known to the inhabitants, though its entrance is concealed from curious eyes. The cavity itself, which contains the nest, is either the abandoned habitation of moles or field-mice, or a cavern purposely dug out by the wasps, which exert themselves with such industry as to accomplish the arduous undertaking in a few days.

When the cavity and entrance to it are completed, the next part of the process is to lay the foundations of the city to be included in it, which, contrary to the usual customs of builders, wasps begin at the top, continuing downwards. It has already been observed, that the coatings which compose the dome, are a sort of rough but thin paper, and that the rest of the nest is composed of the same substance variously applied. “Whence do the wasps derive it?” They are manufacturers of the article, and prepare it from a material even more singular than any of those which have of late been proposed for this purpose; namely, the fibres of wood. These they detach by means of their jaws from window-frames, posts, and rails, &c. and, when they have amassed a heap of the filaments, moisten the whole with a few drops of a viscid glue from their mouth, and, kneading it with their jaws into a sort of paste, or papier mÂchÉ, fly off with it to their nest. This ductile mass they attach to that part of the building upon which they are at work, walking backwards, and spreading it into laminÆ of the requisite thinness by means of their jaws, tongue, and legs. This operation is repeated several times, until at length, by aid of fresh supplies of the material, and the combined exertions of so many workmen, the proper number of layers of paper, that are to compose the roof, is finished. This paper is as thin as the leaf you are reading; and you may form an idea of the labour which even the exterior of a wasp’s nest requires, on being told that no fewer than fifteen or sixteen sheets of it are usually placed above each other, with slight intervening spaces, making the whole upwards of an inch and a half in thickness. When the dome is completed, the uppermost comb is next begun, in which, as well as all the other parts of the building, precisely the same material and the same process, with little variation, are employed. In the structure of the connecting pillars, there seems a greater quantity of glue made use of than in the rest of the work, doubtless with the view of giving them superior solidity. When the first comb is finished, the continuation of the roof or walls of the building is brought down lower; a new comb is erected; and thus the work successively proceeds until the whole is finished. As a comparatively small proportion of the society is engaged in constructing the nest, its entire completion is the work of several months: yet, though the fruit of such severe labour, it has scarcely been finished a few weeks before winter comes on, when it merely serves for the abode of a few benumbed females, and is entirely abandoned at the approach of spring, as wasps are never known to use the same nest for more than one season.

There is good reason for thinking, and the opinion had the sanction of the late Sir Joseph Banks, that wasps have sentinels placed at the entrances of their nests, which, if you can once seize and destroy, the remainder will not attack you. This is confirmed by an observation of Mr. Knight, in the Philosophical Transactions, (vol. 1. 2d Ed. p. 505;) that if a nest of wasps be approached without alarming the inhabitants, and all communication be suddenly cut off between those out of the nest and those within it, no provocation will induce the former to defend it and themselves. But if one escapes from within, it comes with a very different temper, and appears commissioned to avenge public wrongs, and prepared to sacrifice its life in the execution of its orders. He discovered this when quite a boy.

In October, wasps seem to become less savage and sanguinary; for even flies, of which, earlier in the summer, they are the pitiless destroyers, may be seen to enter their nests with impunity. It is then, probably, that they begin to be first affected by the approach of the cold season, when nature teaches them it is useless longer to attend to their young. They themselves all perish, except a few of the females, upon the first attack of frost.

Reaumur, from whom most of these observations are taken, put the nests of wasps under glass hives, and succeeded so effectually in reconciling these little restless creatures to them, that they carried on their various works under his eye.