Jan. 11 Lecture Notes

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6 Feb 2011
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Department
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Jan 11. Lecture
-Stridulation: is the act of producing sound by rubbing together certain body parts (our
lecture today)
Phylum: Arthopoda, Class: Insecta, Order: Orthoptera, Family Gryllidae
-better known as katydids (?)
-males broadcast an acoustic signal to attract females for mating
-high diversity in species and morphology
- calling songs are made by rubbing forewings together
-Katydids that fly have to compromise their sound a little
-Stridualtion is performed by them by using the scraper on the lower file and rubbing it
against the teeth on the bottom side of the upper wing (the file)
-radius: the biggest vein in an insect wing. Separates the fields
-dorsal file moves
-lateral file moves
-lateral file is soft, thick, and curtain like: bad for sound and works to quiet and dampen the
sound
-this allows the insect to make the specific sound it wants to make. The curtain like
part of it works to work against destructive interference
-wine: flapping of the wing
-dipole generator: example given in class: movement of the arms up and down (?)
-monopole generators: dont really exist, small pulsating circle
-destructive interference-_____________
-Condensation: out, rarefaction: in
-transverse:
-stiff wings reverberation
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Document Summary

Stridulation: is the act of producing sound by rubbing together certain body parts (our lecture today) Phylum: arthopoda, class: insecta, order: orthoptera, family gryllidae. Males broadcast an acoustic signal to attract females for mating. Calling songs are made by rubbing forewings together. Katydids that fly have to compromise their sound a little. Stridualtion is performed by them by using the scraper on the lower file and rubbing it against the teeth on the bottom side of the upper wing (the file) Radius: the biggest vein in an insect wing. Lateral file is soft, thick, and curtain like: bad for sound and works to quiet and dampen the sound. This allows the insect to make the specific sound it wants to make. The curtain like part of it works to work against destructive interference. Dipole generator: example given in class: movement of the arms up and down (?) Monopole generators: don"t really exist, small pulsating circle.

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