Entomology : with special reference to its biological and economic aspects . tegmina to make a sound, the femur bearing a series ofteeth, which scrape across the elevated veins of the wing-cover;while the male of Dissosteira makes a crackling sound duringflight or while poising, by means of friction between the frontand hind wings, where the two overlap. Locustida; and Gryllidse stridulate by rubbing the bases ofthe tegmina against each other. Thus in the male Microcen-trinn laurifoUum the left tegmen, which overlaps the right,bears a file-like organ of about fifty-five teeth (Fig. 136), while
Entomology : with special reference to its biological and economic aspects . tegmina to make a sound, the femur bearing a series ofteeth, which scrape across the elevated veins of the wing-cover;while the male of Dissosteira makes a crackling sound duringflight or while poising, by means of friction between the frontand hind wings, where the two overlap. Locustida; and Gryllidse stridulate by rubbing the bases ofthe tegmina against each other. Thus in the male Microcen-trinn laurifoUum the left tegmen, which overlaps the right,bears a file-like organ of about fifty-five teeth (Fig. 136), whilethe opposite tegmen bears a scraper, at right angles to the file. ANATOMY AND PHYSIOLOGY 105 The tegmina are first spread a little; then, as they close gradu-ally, the scraper clicks across the teeth, making from twenty tothirty sharp tic -like sounds in rapid succession. This callguides the female to the male and when they are a few inchesapart she makes now and then a short, soft chirp, to which heresponds with a similar chirp, which is quite unlike the first Fig.
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectentomology, bookyear1
