In the nymph of Onthophagus Taurus there rises, on the front edge of the corselet, a single horn, as strong as the two others and shaped like a cylinder ending in a conical knob. It points forward and is fixed in the middle of the frontal crescent, projecting a little beyond it. The arrangement is gloriously original. The carvers of hieroglyphics would have beheld in it the crescent of Isis wherein dips the edge of the world.
Other singularities complete the curious nymph. To right and left, the stomach is armed, on either side, with four little horns resembling crystal spikes. Total, eleven pieces on the harness: two on the forehead; one on the thorax; eight on the abdomen. The beast of yore delighted in queer horns: certain reptiles of the geological period stuck a pointed spur on their upper eyelids. The Onthophagus, more daring, sports eight on the sides of his belly, in addition to the spear which he plants upon his back. The frontal horns may be excused: they are pretty generally worn; but what does he propose to do with the others? Nothing. They are passing fancies, jewels of early youth; the adult insect will not retain the least trace of them.
The nymph matures. The appendages of the forehead, at first quite crystalline, now show, transparently, a streak [[89]]of reddish brown, curved arc-wise. These are real horns taking shape, consistency and colour. The appendage of the corselet and those of the belly, on the other hand, preserve their glassy appearance. They are barren sacks, void of any self-developing germ. The organism produced them in an impetuous moment; now, scornful, or perhaps powerless, it allows the work to wither and become useless.
When the nymph sheds its covering and the fine tunic of the adult form is torn, these strange horns crumble into shreds, which fall away with the rest of the cast clothing. In the hope of finding at least a trace of the vanished things, the lens in vain explores the bases but lately occupied. There is nothing appreciable left: smoothness takes the place of protuberance; nullity succeeds to reality. Of the accessory panoply that promised so much, absolutely naught remains: everything has disappeared, evaporated, so to speak.
Onthophagus Taurus is not the only one endowed with those fleeting appendages, which vanish wholly when the nymph sheds its clothes. The other members of the tribe possess similar horny manifestations on their bellies and corselets. These all disappear entirely in the perfect insect.
A simple setting forth of the facts does not suffice us: we should like to guess at the motive of this corniculate display. Is it a vague memory of the customs of olden time, when life spent its excess of young sap upon quaint creations, banished to-day from our better-balanced world? Is the Onthophagus the dwarfed representative of an old race of horned animals now extinct? Does it give us a faint image of the past?
The surmise rests upon no valid foundation. The [[90]]Dung-beetle is recent in the general chronology of created beings; he ranks among the last-comers. With him there is no means of going back to the mists of the past, so favourable to the invention of imaginary precursors. The geological layers and even the lacustrian layers, rich in Diptera and Weevils, have so far furnished not the slightest relic of the Dung-workers. This being so, it is wiser not to refer to distant horned ancestors as accounting for their degenerate descendant, the Onthophagus.
Since the past explains nothing, let us turn to the future. If the thoracic horn be not a reminiscence, it may be a promise. It represents a timid attempt, which the ages will harden into a permanent weapon. It lets us assist at the slow and gradual evolution of a new organ; it shows us life working on a portion of the adult’s corselet, which does not yet exist, but which is to exist some day. We take the genesis of the species in the act; the present teaches us how the future is prepared.
And what does the insect that has conceived the ambition of later planting a spear upon its chine propose to make of its projected work? At least as an adjunct of masculine finery, the thing is in fashion among various foreign Scarabs that feed themselves and their grubs on vegetable matters in a state of decomposition. These giants among the wing-cased tribe delight in associating their placid corpulence with halberds terrible to gaze upon.
Look at this one—Dynastes Hercules his name—an inmate of the rotten tree-stumps under the torrid West-Indian skies. The peaceable colossus well deserves his name: he measures three inches long. Of what service can the threatening rapier of the corselet and the toothed lifting-jack of the forehead be to him, unless it [[91]]be to make him look grand in the presence of his female, herself deprived of these extravagances? Perhaps also they are of use to him in certain works, even as the trident helps Minotaurus in crumbling the pellets and carting the rubbish. Implements of which we do not know the use always strike us as singular. Having never associated with the West-Indian Hercules, I must content myself with suspicions touching the purpose of his fearsome equipment.