A new pupal character is increased for T. hirtipupa (Lutz,1910). The existence of teeth is evidenced in the female cibarium of T. guianense (Wise,1911), main species involved in the transmission of Onchocerca volvulus (Leuckart,1893) in the focus of the Amazonian area. A new relationship is proposed among the antenna articles of the T. guianense larva. A new species is described for the genus Thyrsopelma Enderlein,1934, T. jeteri sp.n., collected in Uruguay basin, State of Rio Grande do Sul. The physico-chemical parameters are presented for the type locality. A key is presented for the pupal differentiation inside of Thyrsopelma.
Thyrsopelma; Thyrsopelma jeteri sp.n.; taxonomy; Simuliidae; Neotropical
