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In ascending this scale of being, while there is a progress upwards, the beetles, for instance, being higher than the bugs and grasshoppers; and the butterflies and moths, on the whole, being more highly organized than the flies; and while we see the hymenopterous saw-flies, with their larvæ mimicking so closely the caterpillars of the butterflies, in the progress from the saw-flies up to the bees we behold a gradual loss of the lower saw-fly characters in the Cynips and Chalcid flies, and see in the sand-wasps and true wasps a constant and accelerating likeness to the bee form.
Wallace noticed a kind of sand-wasp, in Borneo, much given to devouring crickets; but there was one species of cricket which exactly reproduced the features of the sand-wasps, and mixed among them on equal terms without fear of detection. Mr.
Many other winged creatures flit and glisten in the garden and down along the grass-invaded path between the coco-nuts. Dragon-flies hover over the moist spots, transparent wings carrying coral-red bodies, and two sand-wasps pilot my steps, following the narrow ribbon of bare ground as a fish the course of a shallow stream, buzzing ominously as if in warning of some possible mischance.
Bates, in his account of the habits of the sand-wasps at Santarem, on the Amazon, gives an interesting account of the way in which they took a few turns in the air around the hole they had made in the sand, before leaving to seek for flies in the forest, apparently to mark well the position of the burrow, so that on their return they might find it without difficulty.
By some strange craft, the wasp knows exactly where to pierce them with her sting, so as to stupefy, but not to kill, just as the sand-wasps of our banks at home stupefy the large weevils which they store in their burrows as food for their grubs. There are wasps too, here, who make pretty little jar-shaped nests, round, with a neatly lined round lip.
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