Parts of India now desert are said to have been deprived of their inhabitants through the dread caused by certain huge spiders known as the Galeodes. Their bite is without doubt extremely painful, and may cause violent headache, fainting fits, or even temporary paralysis. Camels and sheep are sometimes so severely bitten by these spiders that death results.
Occasionally the spider catches a Tartar, for wasps and bees now and again get entangled in the web spread for more helpless victims. Rushing out in a blind fury, the spider closes with his captive, and then follows a fight to the death. Sometimes the spider wins, but as often as not the sting of his would-be victim is thrust home with deadly effect, for the soft and pulpy body of the spider offers a target not easily missed.
There is a saying that we should 'eat to live,' but the dragon-flies seem to have reversed this rule, for they appear almost to 'live to eat,' their appetites being enormous. This is especially true of the larval or infantile stages of growth, and the manner of capturing their prey is peculiar.
Readers of Chatterbox, who combine a love of natural history with a fondness for boating, have probably many a time watched the gauze-winged dragon-fly hawking for flies. But how many have realised that, below the surface of the stream, the coming generation of dragon-flies was waging a precisely similar war—a war, too, even more relentless? The full-fledged dragon-fly cannot bring himself to venture out, even to eat, unless the sun be shining; but the budding dragon-fly has not yet learnt to be so particular, and hunts incessantly, be the weather fine or wet. The apparatus by which his prey is captured cannot, however, be easily described. The mouth of an insect is made up of many separate parts, and that which in other insects forms the 'under-lip,' is in the young dragon-fly peculiarly modified to form what is known as the 'mask.' This remarkable piece of apparatus may be compared to a pair of nippers mounted on a jointed and freely movable handle. When not in use these nippers are kept folded up close under the head; but as soon as prey comes within reach, the nippers flash out, and the victim is seized and brought to the powerful jaws, where it is rapidly torn to pieces.
The weapons of offence of the spider and dragon-fly larva differ in one important particular from those of the bee and the water-bug, and similar insects: the former are used for the capture of victims intended as food, whilst the latter are employed, in the case of the bee, for attack or defence; and in the case of the water-bug for robbing the animal or plant of a small and quite insignificant quantity of its blood, or sap, as the case may be.
W. P. Pycraft, A.L.S., F.Z.S.
- Young Dragon-Fly and "Mask" (magnified).
- Dragon-fly.
- Poison Gland of Spider (much magnified).
- Spider and Bee Fighting.