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Megatibicen pronotalis
Walker's Annual Cicada, Walker's cicada
Megatibicen pronotalis, commonly known as Walker's Annual Cicada or Walker's cicada, is a species of cicada in the family Cicadidae. It is found in the northern Great Plains of the United States and has been reported from states including Illinois, Kansas, Kentucky, Alabama, and Florida. Males produce sound using tymbals—hardened membranes under plates on the venter at the base of the abdomen—and are reportedly among the loudest insects in the world. The species is often associated with riparian cottonwood (Populus) and willow (Salix) habitats.