A revision of the Chilean Brachyglutini – Part 6. Revision of Achilia Reitter, 1890: A. grandiceps, A. valdiviensis, and A. bicornis species groups (Coleoptera: Staphylinidae: Pselaphinae).

The Achilia grandiceps, A. valdiviensis, and A. bicornis species groups sensu Jeannel (1962) of the species-rich genus Achilia Reitter, 1890 are revised. Of the eigth taxa placed in these three groups of species, two subspecies, i.e. A. grandiceps grandiceps Jeannel, 1962 and A. grandiceps delamarei Jeannel, 1962 are raised to species level – A. grandiceps Jeannel, 1962 stat. nov. and A. delamarei Jeannel, 1962 stat. nov. – while three names are placed in synonymy – A. alticola Jeannel, 1962 = A. grandiceps Jeannel, 1962 syn. nov., A. kuscheli Jeannel, 1962 = A. valdiviensis (Blanchard, 1851) syn. nov., and A. chilotides Newton, 2017 = A. excisa (Schaufuss, 1880) syn. nov. – The remaining five species are redescribed, and the new species A. franzi n. sp., A. jeanneli n. sp., and A. elguetai n. sp., attributed to the A. grandiceps group, are described. A new synonymy A. simpsoni Franz, 1996 = A. bicornis Jeannel, 1962 syn. nov. is also established, and the lectotypes of A. delamarei Jeannel, 1962 and Achilia valdiviensis (Blanchard, 1851) are designated. For all these species their distribution is detailed and mapped, and habitat/collecting data are summarized.