Chap. VI.
MUSICAL CRICKET.
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(Acridiidæ). The total length of the body is two inches and a quarter; when the wings are closed the insect has an inflated vesicular or bladder-like shape, owing to the great convexity of the thin but firm parchmenty wing-cases, and the colour is wholly pale-green. The instru-
ment by which the Tananá produces its music is curiously contrived out of the ordinary nervures of the wing-cases. In each wing-case the inner edge, near its origin, has a horny expansion or lobe; on one wing (b) this lobe has sharp raised margins; on the other (a), the strong nervure which traverses the lobe