Morphology and biology of the immature stages ofHydroptila itoiKobayashi (Trichoptera, Hydroptilidae)

Abstract Larvae and pupae of Hydroptila itoi Kobayashi are described. Young larvae are free living without cases, final instar larvae make cases of filamentous algae and some sand particles. Larvae mainly feed by sucking the cell content of green filamentous algae. This species has an annual life cycle in Lake Utonai, Hokkaido, Japan, hibernating in the 2nd‐4th instar.