autumn cicada; cicada that sings in autumn
Refers to cicadas that are heard in autumn, often with a poetic or seasonal nuance. The two senses differ only in phrasing ("when autumn comes" vs. "even in autumn"); they are merged here as they describe the same real-world referent.
See also: 秋蝉
When I hear the sound of autumn cicadas, I feel the end of summer.
Autumn cicadas sing a little more plaintively than summer cicadas.
Compound of 秋 (autumn) + の (possessive particle) + 蝉 (cicada). The exact historical derivation is uncertain, but the phrase is transparently formed from these elements.