Universidade de S?o Paulo;
S?o Paulo;
Instituto de Biociências;
05503-900;
05508-090;
Av. Vital Brasil;
Departamento de Zoologia;
Instituto Butantan;
Laboratório de Cole??es Zoológicas;
Brazil;
SP;
1500;
Mecophilus carioca n. sp. is described based on males and females recently sampled in the Parque Nacional de Itatiaia, and is the first record of the genus from the state of Rio de Janeiro, Brazil. The specimens were analyzed in both light microscopy and scanning electron microscopy, and photos and schematic illustrations are provided. The known distribution of the three species of Mecophilus are presented in a map.