はぐろかげろうであれば
羽黒蜻蛉であれば
haguro kagerōdeareba

Noun
Da Copula

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

1. If it were a black darter dragonfly; If it is a black darter dragonfly

Ba Conditional
Usually Written in Kana