Medusapyga LaBonte and Maddison

LaBonte, James R. & Maddison, David R., 2023, Medusapyga LaBonte and Maddison, a New Genus of Anillini (Coleoptera: Carabidae: Trechinae) from the Pacific Northwest of the United States, Proceedings of the California Academy of Sciences 67 (18), pp. 401-432 : 415

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

Figures

FIGURE 1. (A) Female of Medusapyga alsea from the type locality. (B) Female of M. chehalis from USA, Washington, Thurston Co., 11 km NW of Littlerock, approximately 0.4 km SSW of the type locality, 46.9564°N 123.1366°W, 315 m elevation. Both specimens were freshly killed, and then posed and photographed on soil from their habitats. Scale bars 1 mm.

FIGURE 7. Dorsal views of heads. (A) Medusapyga alsea. (B) M. chehalis. Scale bars 100 µm.

FIGURE 8. Dorsal views of pronota. (A) Medusapyga alsea. (B) M. chehalis. Scale bars 100 µm.

FIGURE 13. Male mesotrochanter, ventral view. (A) Medusapyga alsea, left trochanter. (B) M. chehalis, right trochanter, digitally reversed to make the image more comparable to (A). Scale bars 25 µm.

FIGURE 11. Male aedeagus, left lateral view. (A) Medusapyga alsea, voucher JRL002. (B) M. alsea, voucher JRL013. (C) M. chehalis, voucher JRL012. (D) M. chehalis, voucher JRL010. Scale bar 100 µm.

FIGURE 14. Abdominal keel of a Medusapyga chehalis male. (A) Ventral view second visible abdominal ventrite; arrow points toward abdominal keel. (B) Lateral view. Scale bars 50 µm.