Riethia manauara n. sp., an Amazonian Chironomid (Diptera: Chironomidae) from Brazil

One new species of Riethia Kieffer, Riethia manauara n. sp., is described and figured as male, pupa and larva. The generic diagnosis for pupae and larvae are emended. The specimens were collected from water systems in the Amazon Rainforest in northern Brazil.