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Jan. 11 Lecture Notes

Course Code
Glenn Morris

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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
-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
-stiff wings reverberation
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