Delphacidae

…A general term for insects belonging to the Hemiptera family, Delphacidae. In the past, small insects flying in swarms were collectively called planthoppers, and characters such as unkasu (unka) and unkasu (un mosquito) were used to refer to them.

*Some of the terminology that mentions "Delphacidae" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…半翅目ウンカ科Delphacidaeに属する昆虫の総称。古くは，群れて飛ぶ小さな虫を総称してウンカと呼び，雲霞，雲蚊などの字を用いた。…

※「Delphacidae」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報