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, particula rly absence of standard fixed dorsal setae in adults, and the habitat of to rrential mountain streams, Rawlinsius papillatus (type locality: Mexico, Gu errero, 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 Bros cini, subtribe Broscina (Northern Hemisphere assemblage, excluding Axonya A ndrewes and Broscodes Bolivar) on the basis of common possession of the uni que set of features used to characterize these higher taxa. A key distingui shes Rawlinsius from the other New World genera of Broscini. Separated wide ly both morphologically and geographically from other New World Northern He misphere Broscina, R. papillatus is postulated to be a relictual taxon, its present isolation indicating past connections to a more broadly distribute d northern broscine lineage.