はまとべむしじゃなかったです
浜跳虫じゃなかったです
hamatobe mushijanakattadesu

Noun
Desu Copula

The polite, past negative form of はまとびむし

1. Wasn't a flea.; Wasn't a jumping insect.

Past/Perfective
Negative
Polite
Casual Register
Usually Written in Kana