Insect Stories Part 3

"I can tell you, Mary," I replied. "For a man who once saw one digging told me. It is this way: First he makes a circular groove the full circ.u.mference of the top of the pit. Then he burrows into the sand inside of the groove and piles sand-grains on top of his flat, h.o.r.n.y, shovel-like head with his fore feet. This sand he tosses over the groove so that it will fall outside. He works his way all around the groove, doing this over and over, and then makes another groove inside the first, and digs up and tosses the sand out as before. And so on, groove after groove, each inside the one made before, thus gradually making a conical pit with the sides as steep as the loose sand will lie. The pit must always be made in a dry sandy spot, and is usually located in a warm sunny place at the foot of a large rock. This man said that it is easy to get the ant-lions to dig pits in boxes of sand in the house, and so we can try with our 'collected' fellow."

Mary was silent some moments. Then she said softly, "But how will he get anything to eat?"

"Why," said I, "of course we can give him--" Mary looked up at me in a special way she has. I go on, more slowly, but still without very much hesitation: "But, of course, we sha'n't do that, shall we?"

And Mary said quietly: "No, we sha'n't."

We rested our chins on our hands and lay still, looking down over the chaparral-covered hillside and far out across the hazy valley. On the distant bay were little white specks, small schooners that carry wood and tan-bark and hay from the bay towns to San Francisco; and across the blue bay lifted the bare, brown mountains of the Coast Range, with always that gleaming white spot of the Observatory a-tiptop of the highest peak. It was a soft, languid, lazy day. Such a peace-giving, relaxing, healing day! And we were so enveloped by it, Mary and I, that we simply lay still and happy, with hardly a word. I had, of course, intended to give Mary an informing lecture about how the ugly, horrid ant-lion finally stops preying on ants and rolls himself up in a neat little silk-and-sand ball, and changes into a beautiful, slender-bodied, gauzy-winged creature without any resemblance at all to its earlier incarnation. But I didn't. It was too fine a day to spoil with informing lectures.

And so Mary and I lay still and happy. Finally it was time to go. As we went down the road we pa.s.sed again the place of the pits, and Mary looked once more at the neat little craters with their patient waiting jaws at the bottom.

"I wonder," she said, musingly, "if Mr. Kipling ever saw an ant-lion pit."

"I wonder," said I.

[Ill.u.s.tration: ARGIOPE OF THE SILVER s.h.i.+ELD]

ARGIOPE OF THE SILVER s.h.i.+ELD

Argiope of the Silver s.h.i.+eld is the handsomest spider that Mary and I know. Do you know a handsomer? Or are you of those who have prejudices, and hold all spiders to be ugly, hateful things? We are so sorry for you if you are, for that means you can never enjoy having a pet Argiope. The truth is, Mary and I like clever and skillful people, but when we can't find that kind, we rather prefer clever and skillful spiders and wasps or other lowly beasties to the other sort of people, which shows just how far a fancy for nature may lead one.

It _is_ rather bad, of course, to prefer to chum with a spider, even such a wonderfully handsome and clever one as Argiope, instead of with a human soul. But that isn't our situation exactly. We prefer human souls to anything else on earth, but not human stomachs and livers and human bones and muscles and sick human nerves. And, someway, too many people leave on one an impression of bowels or sore eyes rather than one of mind and soul. So we rush to the fields or woods or roads after such an experience and live a while with the keen bright eyes, the sensitive feelers, the dexterous feet and claws and teeth, and the sharp wits of the small folk who, while not human, are nevertheless inhabitants and possessors of this earth, side by side with us, and are truly our blood-cousins, though some incredible number of generations removed.

Mary and I sc.r.a.ped acquaintance with our Argiope in a cypress-tree.

That is, Argiope had her abiding-place there; she was there on her great symmetrical orb-web, with its long strong foundation lines, its delicate radii and its many circles with their thousands of tiny drops of viscid stuff to make them sticky. In the center was the hub, her resting-place, whence the radii ran out, and where she had spun a broad zigzaggy band of white silk on which she stood or sat head downward. Her eight long, slender, sensitive legs were outstretched and rested by their tips lightly on the bases of the taut radii so that they could feel the slightest disturbance in the web.

These many radii, besides supporting the sticky circles or spiral, which was the real catching part of the web, acted like so many telegraph lines to carry news of the catching to waiting Argiope at the center.

I have said that Mary and I think Argiope of the Silver s.h.i.+eld the most handsome spider we know. There are, however, other Argiopes to dispute the glory with our favorite; for example, a golden-yellow-and-black one and another beautiful silver-and-russet one. Other people, too, may fancy other spiders; perhaps the little pink-and-white crab-spiders of the flower-cups, or the curious spiny Acrosomas and Gasteracanthas with their brilliant colors and bizarre patterns and shape. Others may like the strawberry Epeira, or the diadem-spider, or the beautiful Nephilas. There are enough kinds and colors and shapes of spiders to satisfy all tastes. But we like best and admire most the long-legged, agile, graceful Argiopes, and particularly her of the silver s.h.i.+eld. Her full, firm body with its flat, s.h.i.+eld-shaped back, all s.h.i.+ning silver and crossed by staring black-and-yellow stripes, the long tapering legs softly ringed with brown and yellow, the s.h.i.+ning black eyes on their little rounded hillock of a forehead, and the broad, brown under body with eight circular silver spots; all go to make our Argiope a richly dressed and stately queen of spiders. But the royal consort--O, the less said of him, the better. A veritable dwarf; insignificant, inconspicuous and afraid for his life of his glorious mate. How such a queen could ever--but there, how tiresome, for that is what gets said of most matches, royal or plebeian.

Mary and I brought Argiope in from her home in the cypress-tree and put her in a fine, roomy, light and airy cage, where she could live quietly and unmolested by enemies, and where we could see to it that she should not lack for food. There are many of the small creatures with which we get acquainted that do not object at all to being brought into our well-lighted, well-ventilated, warm vivarium--that means live-room. Creatures of sedentary habits, and all the web-making spiders are of course that, ought not to object at all and usually do not seem to. For they get two things that they cannot be sure of outside: protection and plenty of food. Argiope seemed perfectly content and settled right down to spinning a glistening new web, a marvel of symmetry and skillful construction, in her roomy cage, and in a day or two was seated quietly but watchfully on the broad-banded hub in the center, with her toes on her telegraph lines, ready for good news. It was, of course, our duty to see that she was not disappointed.

The message she wanted was from some struggling fly fastened anywhere in the broad expanse of web. So we tossed in a fly. It buzzed about a moment, then blundered into the web which it shook violently in its struggle to escape. Argiope rushed at once out upon the web.

"How can she run about on the sticky web without getting caught, too?"

interrupts Mary.

I think a moment, then with some dignity reply: "Pretty soon, please, Mary."

Argiope, I repeat, rushed at once out upon the web, seized the fly in her jaws and ran back to the hub with it, where she appeared to wet it all over, squeeze it into a ball and then proceed to feed upon it, holding and manipulating it skillfully all the time in her jaws.

Evidently Argiope was very hungry, for as you will see, this is not her usual way of taking care of her prey.

"Now, Mary, what was it you asked?"

"Oh, just how the spider can run around so fast on the web without sticking to it and getting caught or tearing it all to pieces."

"Ah,--ah, yes. Well, Mary, I don't know! that is, exactly; or, well not even very close to exactly. But she does it, you see."

"Yes, I see," said Mary, demurely, and--can it be that Mary is slightly winking one eye? I do hope not.

"Of course you know, Mary, that the web is made of two kinds of silk or rather two kinds of lines? Oh, you didn't know?" Mary has shaken her head.

"Well it is," I continue, with my usual manner of teacher-who-knows somewhat restored again. "The foundation lines, the radii and a first set of circles are all made of lines without any sticky stuff on them.

As you see"--and I touch my pencil confidently to a radius, with the manner of a parlor magician. "Then the spider, on this foundation, spins in another long spiral, the present circles of the web, which is liberally supplied with tiny, s.h.i.+ning droplets of viscid silk that never dries, but stays moist and very sticky all the time. This is the true catching part of the web."

"We surely must watch her spin a web sometime," breaks in eager Mary.

"We certainly must," say I, and continue. "Now perhaps when Argiope runs out on the web from her watching-place at the hub, she only puts her long delicate feet on the unsticky radii. Or perhaps her feet are made in some peculiar way so that they do not stick to the circles. As a matter of fact, a spider's foot is remarkably fas.h.i.+oned, with curious toothed claws, and hosts of odd hairs, some k.n.o.bbed, some curved and hook-like, and some forming dense little brushes. But after all, Mary, the truth is, I don't know really how it is that spiders can run about over their webs without getting stuck to them."

After my long discursus about web-making and spider's feet, it seemed time to give Argiope another fly. Indeed her bright little black eyes seemed to Mary to be s.h.i.+ning with eagerness for more fly, although she still had the remains of the first one in her jaws--gracious, Argiope's jaws, please, not Mary's!

So we tossed in another fly. We hope you won't think this cruel. But flies are what Argiope eats, and if she was out in the garden, she would be catching them, and, what is worse, they would not be the disgusting and dangerous house-flies and bluebottles that we feed her, but all sorts of innocent and beautiful little picture-winged flower-flies and pomace-flies and what not. House-flies and stable-flies and bluebottles are truly dangerous because they help spread human diseases, especially typhoid fever. So if we are to live safely they should be killed. Or, better, prevented from hatching and growing at all.

So we tossed in another fly. Argiope immediately dropped the nearly finished first fly into the web, ran out to the new one and pounced on it, seizing it with her fore legs. Then she doubled her abdomen quickly underneath her and there issued from the spinnerets at its tip a jet, a flat jet of silk, which was caught up by the hind feet and wrapped around the fly as it was rolled over and over by the front feet. She tumbled it about, all the time wrapping it with the issuing band of silk, until it was completely enswathed. Then she left it fastened in the web, went back to the hub, and resumed her feeding on the first fly. But soon she finished this entirely, dropped the wreck out of the web and went out and got the second fly, bringing it back to the hub to eat.

"But why," asked Mary, "does Argiope wrap the fly up so carefully in silk? Why not just kill it by biting, and then leave it in the web until she wants it?"

"Perhaps," I answer, "she wants to make it helpless before she comes to close quarters with it. You notice she holds it away from her body with her fore feet and pulls the silk band out far with her hind feet so that her body does not touch the fly at all while she wraps it.

Perhaps she is not sure that it isn't a bee or some other stinging insect. It buzzes loud enough to make me think it a bee."

So Mary and I decided to try some experiments with our Argiope to find out, if possible, first, if she could tell a bee from a fly, and second, if so, whether she treated it differently, and third, why she wraps her prey up so carefully before coming to too close quarters with it. We feel quite proud of these experiments because we seemed to be doing something really scientific; and we know that Experimental Zoology, that is, studying animals by experimenting with them, is quite the most scientific thing going nowadays among professional naturalists. So here are our notes exactly as we wrote them during our experimenting. This is, of course, the correct manner for publis.h.i.+ng real scientific observations, because it gives the critical reader a chance to detect flaws in our technique!

OUR NOTES ON THE BEHAVIOR OF ARGIOPE

"Nov. 18, 4:45 P.M.; released a fly in the cage. The spider pounced upon it, seized it with fore and third pair of legs, threw out a band of silk and enswathed it, tumbling it over and over with her hind feet about thirteen times, hence enswathed it in thirteen wrappings of silk. The fly was then disconnected from the web, the spider making but little attempt to mend the gap. It was carried to the hub and eaten. While the feast was going on, a honey-bee [with sting extracted; we didn't want to run any risks with Argiope!] was liberated in the cage. As soon as it touched the web, the spider was upon it, throwing out a band of silk in a sheet a quarter of an inch broad. ['Drawing out' would be more accurate, for the spinnerets cannot spurt out silk; silk is drawn out and given its band character by lightning-like movements of the comb-toothed hind feet.] With her hind legs Argiope turned the bee over and over twenty-five or twenty-six times, thus enswathing it with twenty-five or twenty-six wrappings of the silken sheet.

"No sooner was the bee enswathed than a second bee was liberated in the cage and caught in the web. This was treated by the spider like bee No. 1.

"Nov. 20, 8:15 A.M.; Argiope perfectly still in center of hub, feeding on bee No. 2. The only thing that reveals the feeding is a slight moving of the bee's body as the juices are sucked up. Remains of bee No. 1 dropped to the bottom of the cage.

"Fed all day, 8:15 A.M. to 5 P.M., on bee No. 2.

"At 2:30 P.M., a box-elder bug, which is very ill-smelling, was thrown into the web. Argiope did nothing for three minutes, then went out on the web to it and wrapped, making five complete turns; then went away.

Probably not hungry, as she has had two bees and a fly in three days.

"Nov. 21, 8:15 A.M.; box-elder bug finished during last night. Old web replaced by a new one with twenty-nine radii, eleven complete spirals and several partial spirals. The hub is formed of fine irregular webbing about an inch and a half in diameter, without the viscid droplets that cover the spirals. An open s.p.a.ce of about a half-inch intervenes between the hub and the beginning of the spirals.

"4:30 P.M.; liberated a fly in the cage. Argiope pounced upon it and began to eat immediately, not taking time or trouble to enswath it.

"While the fly was being devoured, we liberated a strong-smelling box-elder bug in the cage. It flew into the web. Argiope, by a quick movement, turned on the hub toward the bug and stood in halting position for eight seconds, then approached the bug slowly, hesitated for a second or two, then wrapped it about with five wrappings, halted again, and finally finished with five more wrappings. The bug was then attached to the web where it had first touched, the spider pa.s.sing back to the center and resuming her meal.

"When the fly was finished, Argiope walked over to the bug, grasped it in her mandibles, walked up to the hub, turned herself about so that her head was downward, manipulated the bug with her fore and third pair of feet until it seemed to be in right position for her with reference to the hub of the web, and began to feed.

"5 P.M.; bee liberated in cage _with sting not extracted_. Argiope leaped instantaneously to the spot where it was caught, enswathed it with great rapidity thirty-seven times, then bit at it, and enswathed it five times more, making forty-two complete wrappings in all, then left it fastened in the web and resumed feeding upon the bug. All the time she was wrapping it, Argiope kept her body well clear of the bee's body, the spinnerets being fully one-half an inch from the bee, making the broad band of issuing silk very noticeable. In biting it, which she seemed to do with marked caution, she of course had to bite through the silken covering.