Two new species of Reductoniscus Kesselyak, 1930 from New Guinea (Crustacea, Oniscidea, Armadillidae)

Two species of Reductoniscus Kesselyak, 1930 (Armadillidae), R. novaehiberniae and R. pulcher, from New Ireland (Papua New Guinea) are described as new. R. costulatus Kesselyak, 1930 is recorded from Singapore, Malaysia and the Hawaiian Islands. The composition of the genus is discussed. R. gibbus Lemos de Castro, 1972, R. leleupi Vandel, 1977, R. mellissi Vandel, 1977, R. insularis Vandel, 1977 and R. watti Vandel, 1977 are transferred to the genus Pseudodiploexochus Arcangeli, 1934. Pseudodiploexochus leleupi Taiti & Ferrara, 1979 is renamed P. zairensis nom. nov as junior secondary homonym of P. leleupi (Vandel, 1977).