This note reports phoresy between larvae of Rheotanytarsus Thienemann & Bause, 1913 (Chironominae, Tanytarsini) and adult of Hexacylloepus Hinton, 1940 and Microcylloepus Hinton, 1935 (Coleoptera, Elmidae). The specimens had been collected in streams from State Park Campos do Jordão, São Paulo State, Brazil.
Aquatic insect; neotropics; phoresy