Pselaphotheseus ihupuku, new species, is described from Campbell Island, New Zealand and compared with the previously described Campbell Island pselaphine, P. hippolytae Park. Additional collecting records of P. hippolytae are also provided. Both species are apparently endemic to Campbell Island, and coexist in sympatry there. Entomological surveys of New Zealand's subantarctic island groups are incomplete, however, and the genus may be more widespread than is currently recognised.
