Singular Proceedings Of The Sand Wasp. (From Howitt's Country Year-Book.)
In all my observations of the habits of living things, I have never seen any thing more curious than the doings of one species of these ammophilæ—lovers of sand. I have watched them day after day, and hour after hour, in my garden, and also on the sandy banks on the wastes about Esher, in Surrey, and always with unabated wonder. They are about an inch long, with orange-colored bodies, and black heads and wings. They are slender and most active. You see them on the warm borders of your garden, or on warm, dry banks, in summer, when the sun shines hotly. They are incessantly and most actively hunting about. They are in pursuit of a particular gray spider with a large abdomen. For these they pursue their chase with a fiery quickness and avidity. The spiders are on the watch to seize flies; but here we have the tables turned, and these are flies on the watch to discover and kill the spiders. These singular insects seem all velocity and fire. They come flying at a most rapid rate, light down on the dry soil, and commence an active search. The spiders lie under the leaves of plants, and in little dens under the dry little clods. Into all these places the sand-wasp pops his head. He bustles along here and there, flirting his wings, and his whole body all life and fire. And now he moves off to a distance, hunts about there, then back to his first place, beats the old ground carefully over, as a pointer beats a field. He searches carefully round every little knob of earth, and pops his head into every crevice. Ever and anon, he crouches close among the little clods as a tiger would crouch for his prey. He seems to be listening, or smelling down into the earth, as if to discover his prey by every sense which he possesses, He goes round every stalk, and descends into every hollow about them. When he finds the spider, he dispatches him in a moment, and seizing him by the centre of his chest, commences dragging him off backward.
He conveys his prey to a place of safety. Frequently he carries it up some inches into a plant, and lodges it among the green leaves. Seeing him do this, I poked his spider down with a stick after he had left it; but he speedily returned, and finding it fallen down, he immediately carried it up again to the same place.
Having thus secured his spider, he selects a particular spot of earth, the most sunny and warm, and begins to dig a pit. He works with all his might, digging up the earth with his formidable mandibles, and throwing it out with his feet, as a dog throws out the earth when scratching after a rabbit. Every few seconds he ascends, tail first, out of his hole, clears away the earth about its mouth with his legs, and spreads it to a distance on the surface. When he has dug the hole, perhaps two inches deep, he comes forth eagerly, goes off for his [pg 593] spider, drags it down from its lodgment, and brings it to the mouth of his hole. He now lets himself down the hole, tail first, and then, putting forth his head, takes the spider, and turns it into the most suitable position for dragging it in.
It must be observed that this hole is made carefully of only about the width of his body, and therefore the spider can not be got into it except lengthwise, and then by stout pulling. Well, he turns it lengthwise, and seizing it, commences dragging it in. At first, you would imagine this impossible; but the sand-wasp is strong, and the body of the spider is pliable. You soon see it disappear. Down into the cylindrical hole it goes, and anon you perceive the sand-wasp pushing up its black head beside it; and having made his way out he again sets to work, and pushes the spider with all his force to the bottom of the den.
And what is all this for? Is the spider laid up in his larder for himself? No; it is food for his children? It is their birth-place, and their supply of provision while they are in the larva state.
We have been all along calling this creature he, for it has a most masculine look; but it is in reality a she; it is the female sand-wasp, and all this preparation is for the purpose of laying her eggs. For this she has sought and killed the spider, and buried it here. She has done it all wittingly. She has chosen one particular spider, and that only, for that is the one peculiarly adapted to nourish her young.
So here it is safely stored away in her den; and she now descends, tail first, and piercing the pulpy abdomen of the spider, she deposits her egg or eggs. That being done, she carefully begins filling in the hole with earth. She rakes it up with her legs and mandibles, and fills in the hole, every now and then turning round and going backward into the hole to stamp down the earth with her feet, and to ram it down with her body as a rammer. When the hole is filled, it is curious to observe with what care she levels the surface, and removes the surrounding lumps of earth, laying some first over the tomb of the spider, and others about, so as to make that place look as much as possible like the surface all round. And before she has done with it—and she works often for ten minutes at this leveling and disguising before she is perfectly satisfied—she makes the place so exactly like all the rest of the surface, that it will require good eyes and close observation to recognize it.
She has now done her part, and Nature must do the rest. She has deposited her eggs in the body of the spider, and laid that body in the earth in the most sunny spot she can find. She has laid it so near the surface that the sun will act on it powerfully, yet deep enough to conceal it from view. She has, with great art and anxiety, destroyed all traces of the hole, and the effect will soon commence. The heat of the sun will hatch the egg. The larva, or young grub of the sand-wasp, will become alive, and begin to feed on the pulpy body of the spider in which it is enveloped. This food will suffice it till it is ready to emerge to daylight, and pass through the different stages of its existence. Like the ostrich, the sand-wasp thus leaves her egg in the sand till the sun hatches it, and having once buried it, most probably never knows herself where it is deposited. It is left to Nature and Providence