Medusapyga LaBonte and Maddison, a New Genus of Anillini (Coleoptera: Carabidae: Trechinae) from the Pacific Northwest of the United States Author LaBonte, James R. 1570 Kenard Street NW, Salem, OR 97304, USA. Author Maddison, David R. Department of Integrative Biology, Oregon State University, Corvallis, OR 97331, USA. text Proceedings of the California Academy of Sciences 2023 2023-02-15 67 18 401 432 journal article 299337 10.5281/zenodo.11067222 1cb742f7-205f-4cc5-9136-b613d5ab059d 0068-547X 11067222 Key to species of Medusapyga LaBonte and Maddison Head with a declivous medial frontoclypeal prominence ( Figs 1A , 7A ); pronotum with sharp rectangular or acute hind angles ( Fig. 8A ); mesotrochanter with large, blunt, triangular tooth protruding from posterior margin ( Fig. 13A ); male visible abdominal ventrite 2 without medial preapical keel; aedeagus as in Figs. 11A, B .................................................. Medusapyga alsea LaBonte Head with the frontoclypeal region gradually and shallowly convex ( Figs 1B , 7B ); pronotum with rounded hind angles ( Fig. 8B ); posterior margin of mesotrochanter more-or-less evenly arcuate ( Fig. 13B ); male visible abdominal ventrite 2 with a medial preapical keel which is sharply pointed and declivous at the posterior ( Fig. 14 ); aedeagus as in Figs. 11C, D ................... Medusapyga chehalis LaBonte