おはぐろかげろうだったら
御歯黒蜻蛉だったら
ohagurokagerōdattara

Noun
Da Copula

The "-tara" conditional form ("if/when…") of おはぐろとんぼ

1. If it were a black dragonfly…; If it was a black dragonfly…

Tara Conditional
Usually Written in Kana