Rheocricotopus, habitat, larval dwelling, seasonal emergence. The immatures (larva and pupa) of Rheocricotopus (Psilocricotopus) valgus Chaudhuri & Sinharay are described for the first time. The species belongs to chalybeatus group. The larva is opportunistic, present in the fast-flowing streams to slow-flowing organically enriched sewage drains. It lives in tunnels made of various particles glued together by silky secretions. There are two generations a year with peak emergence in April-May and September-November. The sex ratio of females to males is 2:1. Stades immatures de Rheocricotopus (Psilocricotop us) valgus Chaudhuri & Sinharay de l'Himalaya et notes sur l'ecolo gie (Diptera : Chironomidae) Mots cles : larve, nymphe, habitats, emergence saisonniere. Les stades immatures, larve et nymphe de Rheocricotopu s (Psilocricotopus) valgus sont decrits pour la premiere fois. L'espece appartient au groupe chalybeatus. La larve est opportuniste et colonise aussi bien les rivieres a debit rapide que les canaux d'egouts riches en matiere organique. Elle vit dans des fourreaux faits de particules variees reunies par des secretions soyeuses. Il y a 2 generations annuelles avec un pic d'emergence en avril-mai et septembre-novembre. Le sex-ratio femelle/mâle est 2:1.
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