Abstract
The larvae and pupae of Eurycnemus sp. were found in the prepupal and pupal cases of Goera japonica (Trichoptera) collected in the Nishiki River in Iwakuni City, Yamaguchi Prefecture, Japan. The morphological characteristics of the chironomid larvae and pupae were almost identical with the description of Eurycnemus crassipes (Panzer) by Murry and Ashe (1981). The present observation appears to be the first report of the chironomid species which is parasitic on Trichoptera. Examination of the imago of Eurycnemus sp. is required before its specific name can be given.
