深山川蜻蛉

From 深(み) (mi, “deep”) + 山川(やまがわ) (yamagawa, “mountains and rivers”) + 蜻蛉(とんぼ) (tonbo, “dragonfly, damselfly”)

深(み)山(やま)川(がわ)蜻蛉(とんぼ) or 深山川蜻蛉(ミヤマガワトンボ) • (miyamagawatonbo) 

1. Calopteryx cornelia (a species of damselfly)

As with many terms that name organisms, this term is often spelled in katakana, especially in biological contexts (where katakana is customary).