Keys used for
this identification

Submentum approximately triangular, with laterally barely extended lateral lobes.

Posterior median prosternite dark (A) and separated from the lateral prosternite (B).

Frontoclypeus widest in the middle with straight anterior margin.

THE KESSELBACH BENTHOS REPORT

Species Hydropsyche instabilis

There was a redominat presence of H.instabilis, I have found more than 20 larvae of this species.