Some Australian #Epipaschiinae have bulges in the forewing costa, along with messy scale tufts in the same area, but I'd expect scales to dampen any potential auditory effects. I always took it that structures like these are for spreading pheromones.
See also the forewings of these pug moths (#Geometridae #Eupitheciini):
https://inaturalist.ala.org.au/taxa/602535-Sigilliclystis-insigillata
Sigillictystis insigillata is a species of moth of the family Geometridae. It is found in Australia, including Tasmania. (Source: Wikipedia, '', http://en.wikipedia.org/wiki/Sigillictystis_insigillata, CC BY-SA 3.0 . Photo: (c) Ian McMaster, some rights reserved (CC BY-NC), uploaded by Ian McMaster)
Whoa! Such a pretty new #pyralid #moth in yesterday's #Zootaxa. And Zootaxa itself has undergone a makeover.
Qi, 2023, "First description of a new species of Lista (Lepidoptera, Pyralidae, Epipaschiinae) from Cambodia"
https://doi.org/10.11646/zootaxa.5389.1.10
#entomology #lepidoptera #pyralidae #epipaschiinae #lista #cambodia #newspecies
Donald Hobern