こうしかげろうだったら
紅糸蜻蛉だったら
kōshikagerōdattara

Noun
Da Copula

The "-tara" conditional form ("if/when…") of べにいととんぼ

1. If it were a red thread dragonfly…; If it were to be a red thread dragonfly…

Tara Conditional
Usually Written in Kana