This work presents the description of a new of the genus Larsia Fittkau, 1962 (Diptera: Chironomidae: Tanypodinae). The genus until the moment it is represented by 23 species in the world. In the Neotropical region, according to Spies & Reiss (1996) four species were already described, being three from Guatemala, L. fittkaui Sublette & Sasa, 1994, L. planensis Johannsen, 1946, L. reissi Sublette & Sasa, 1994 and only from Argentina, L. pallescens Edwards, 1931. The new species was collected in the State of Rio de Janeiro, coming from Araras, municipal district of Petrópolis, RJ, being the first registration of the genus from Brazil. The slides with the material type are deposited in the Entomological Collection of the Instituto Oswaldo Cruz.
Tanypodinae; Larsia; new species; Rio de Janeiro; Brazil
