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The head is in form much like that of certain larvæ of Neuroptera and of Forficula, an Orthopterous insect. The antennæ are usually four-jointed, and vary in length in the different genera. The mouth-parts are very difficult to make out, but by soaking the insect in potash for twenty-four hours, thus rendering the body transparent, they can be satisfactorily observed.
The species of Pneumora have been more profoundly modified for the sake of stridulation than any other orthopterous insect; for in the male the whole body has been converted into a musical instrument, being distended with air, like a great pellucid bladder, so as to increase the resonance. Mr. Trimen informs me that at the Cape of Good Hope these insects make a wonderful noise during the night.
A strange kind of wood-cricket is found in this neighbourhood, the males of which produce a very loud and not unmusical noise by rubbing together the overlapping edges of their wing-cases. The notes are certainly the loudest and most extraordinary that I ever heard produced by an orthopterous insect.
Did they know just at what hour the trout ceased leaping at dark fly or moth, and could see only in the dim light the ghostly white miller? Did they know the comparative merits, as a tempting bait, of grasshopper, cricket, spider, or wasp; and could they, with bits of wool, tinsel, and feather, copy the real dipterous, hymenopterous, or orthopterous insect?
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