Show Hearing of ot Butterflies The hearing of certain butterflies the the moths and the spiders has been n a subject of much mach study b by I. I F P. P Eggers whose results have been reported report d In Ina Ina ina a Berlin zoological annual The seat sent sentor of or hearing Is found to be the t tym ni panni organ org of the last ring of ot the thorax The filled air-filled vesicle or bladder of this organ adjoins two very thin spots In the external chitin and nH of or these thee Is the true drumhead connected with ith a n nerve strand having two sensory sensor cells while the other th the so called opposite drumhead seem to serve sern as a n. sounding board to re- re enforce vibrations E Experiments s with crickets have shown that the chirping of or the tho male Is heard heald only Oly by females ln ha having the t tj organ Intact The organ of the butterflies which Is more mor sensitive c cannot be tested In the same w way i but response has been had t to J Jer er very high shrill tones such SUell as that made by rubbing a u cork against a wet glass and In one species to a clutterIng clutterIng cluttering clutter- clutter Ing sound made by the wings of ot the male Butterflies flying by day seem to co have hearing organs organs more generally than those thos that are arc active at night |