New records of mosquito species in the provinces of Chaco and Formosa, Argentina.

Seven mosquito species are recorded for the 1st time for northeastern Argentina: Culex (Melanoconion) albinensis, Cx. (Mel.) elevator, Cx.

New records of mosquito species in the province of Formosa, northeastern region of Argentina.

Six species are recorded for the 1st time in Formosa province, northeast region of Argentina: Culex delpontei, Cx. eduardoi, Cx. maxi, [corrected] and Toxorhynchites theobaldi, increasing the number of species of that province to 73.