Elementary studies in insect life Elementary studies in insect life elementarystudie00hunt Year: 1902 FIG. 30. Front leg of cricket, showing ear-like organ (a). ing. This cover corresponds in its use to the tympanum of our own car. On the internal surface of this tympanum there are two horn-like processes, and at- tached to these is a very delicate little sac filled with a transparent fluid. This sac represents the membranous laby- rinth, and is connected with the auditory nerve, which goes to the brain. This tympanal structure is to be found in the common black .cricket, fa- miliar katydid,
Elementary studies in insect life Elementary studies in insect life elementarystudie00hunt Year: 1902 FIG. 30. Front leg of cricket, showing ear-like organ (a). ing. This cover corresponds in its use to the tympanum of our own car. On the internal surface of this tympanum there are two horn-like processes, and at- tached to these is a very delicate little sac filled with a transparent fluid. This sac represents the membranous laby- rinth, and is connected with the auditory nerve, which goes to the brain. This tympanal structure is to be found in the common black .cricket, fa- miliar katydid, and their allies, on the inside of the tibia of the front leg. The organs of hearing have different locations in dif- ferent insects. It has been demonstrated that the an- tenna1 of the male mosquito vibrate to the sound-wave of the tuning-fork. It is quite probable that a num- ber of other insects per- ceive sounds through nerves which terminate exteriorly in the antenna1. The functions of the an- tennal nerves of insects are varied, capable of per- ceiving contact, odor, and FIG. 31. Wing-covers of male katydid, The one on left shows heavy file-like structure on under side near base (en- larged just above wing); the one on right shows membranous structure near base with pointed ridge on upper side (en- larged just above wing), extending out- ward. The right wing is passed under the left wing, the sharp ridge rasps upon the file of the left wing, the membrane of the left wing vibrates, producing the ' song ' of the katydid.
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Photo credit: © Bookworm / Alamy / Afripics
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