こがねむしじゃなかったです
黄金虫じゃなかったです
koganemushijanakattadesu

Noun
Desu Copula

The polite, past negative form of こがねむし

1. Wasn't a golden bug.; Wasn't a golden insect.

Past/Perfective
Negative
Polite
Casual Register
Usually Written in Kana