Possibly my affection for spiders is due in a great
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180 The Naturalist in La Plata.
measure to the compassion I have always felt for them. Pity, 'tis said, is akin to love; and who can help experiencing that tender emotion that considers the heavy affliction nature has laid on the spiders in compensation for the paltry drop of venom with which she, unasked, endowed them! And here, of course, I am alluding to the wasps. These insects, with a refinement of cruelty, prefer not to kill their victims outright, but merely maim them, then house them in cells where the grubs can vivisect them at leisure. This is one of those revolting facts the fastidious soul cannot escape from in warm climates; for in and out of open windows and doors, all day long, all the summer through, comes the busy beautiful mason-wasp. A long body, wonderfully slim at the waist, bright yellow legs and thorax, and a dark crimson abdomen,--what object can be prettier to look at? But in her life this wasp is not beautiful. At home in summer they were the pests of my life, for nothing would serve to keep them out. One day, while we were seated at dinner, a clay nest, which a wasp had succeeded in completing unobserved, detached itself from the ceiling and fell with a crash on to the table, where it was shattered to pieces, scattering a shower of green half-living spiders round it. I shall never forget the feeling of intense repugnance I experienced at the sight, coupled with detestation of the pretty but cruel little architect. There is, amongst our wasps, even a more accomplished spider-scourge than the mason-wasp, and I will here give a brief account of its habits. On the grassy pampas, dry bare spots of soil are resorted to by a class of
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spiders that either make or take little holes in the ground to reside in, and from which they rush forth to seize their prey. They also frequently sit inside their dens and patiently wait there for the intrusion of some bungling insect. Now, in summer, to a dry spot of ground like this, comes a small wasp, scarcely longer than a blue-bottle fly, body and wings of a deep shining purplish blue colour, with only a white mark like a collar on the thorax. It flirts its blue wings, hurrying about here and there, and is extremely active, and of a slender graceful figure--the type of an assassin. It visits and explores every crack and hole in the ground, and, if you watch it attentively, you will at length see it, on arriving at a hole, give a little start backwards. It knows that a spider lies concealed within. Presently, having apparently matured a plan of attack, it disappears into the hole and remains there for some time. Then, just when you are beginning to think that the little blue explorer has been trapped, out it rushes, flying in terror, apparently, from the spider who issues close behind in hot pursuit; but, before they are three inches away from the hole, quick as lightning the wasp turns on its follower, and the two become locked together in a deadly embrace. Looking like one insect, they spin rapidly round for a few moments, then up springs the wasp--victorious. The wretched victim is not dead; its legs move a little, but its soft body is paralyzed, and lies collapsed, flabby, and powerless as a stranded jellyfish. And this is the invariable result of every such conflict. In other classes of beings, even the
182 The Naturalist in La Plata.