English: Fig. 18. The front wings, or tegmina, of a meadow grasshopper, Orchelimum laticauda, illustrating the sound-making organs typical of the katydid family

A, left front wing and basal part of right wing of male, showing the four main veins: subcosta (Sc), radius (R), media (M), and cubitus (Cu); also the enlarged basal vibrating area, or tympanum (Tm), of each wing, the thick file vein (fv) on the left, and the scraper (s) on the right B, lower surface of base of left wing of male, showing the file (f) on under side of the file vein (A, fv)

C, right front wing of female, which has no sound-making organs, showing simple normal venation