noun
Lyristes japonicus; a species of cicada
A specific cicada species found in Japan; often referred to by its scientific name or simply as a type of cicada.
北海道ではエゾゼミの鳴き声が夏の風物詩だ。
In Hokkaido, the song of the Ezozemi cicada is a summer tradition.
セミ is the general term for cicada; エゾゼミ refers specifically to the species Lyristes japonicus.
The name combines 蝦夷 (Ezo, old name for Hokkaido) and 蝉 (semi, cicada), referring to its habitat. The exact derivation is straightforward from the components.