The tribe Broscini in Mexico:: Rawlinsius papillatus, new genus and new species (Insecta: Coleoptera: Carabidae), with notes on natural history and evolution

Based on structural and ecological features of adults and larvae, particularly absence of standard fixed dorsal setae in adults, and the habitat of torrential mountain streams, Rawlinsius papillatus (type locality: Mexico, Guerrero, Sierra Madre del Sur, 26 km NW El Paraiso, 1800 m) is described as a new monobasic genus and species. This species is placed in the tribe Broscini, subtribe Broscina (Northern Hemisphere assemblage, excluding Axonya Andrewes and Broscodes Bolivar) on the basis of common possession of the unique set of features used to characterize these higher taxa. A key distinguishes Rawlinsius from the other New World genera of Broscini. Separated widely both morphologically and geographically from other New World Northern Hemisphere Broscina, R. papillatus is postulated to be a relictual taxon, its present isolation indicating past connections to a more broadly distributed northern broscine lineage.