Anillini

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 : 409

Key to the Genera of North American (North of Mexico) Anillini

1. Mandibles extremely long and narrow, much longer than head behind the antennal insertions (Fig. 3); sides of head behind antennal insertions more-or-less parallel and straight; frontal furrows deep and long, extending to occiput (Fig. 3); lateral explanation of elytron very broad in anterior half, abruptly narrowing thereafter (Fig. 3); geographic range Sierra Nevada, California ............ Anillaspis Casey

– Mandibles shorter and stouter, shorter than head behind the antennal insertions ( Fig. 2 ); sides of head behind antennal insertions rounded; frontal furrows shallow and short, extending no more than halfway to occiput ( Fig. 2 ); lateral explanation of elytra much narrower and broadest only near the humeri or in the anterior quarter, gradually narrowing until terminating before the apex ( Fig. 2 )............... 2

2. Mentum with a pair of setae near apex of anteromedial tooth; geographic range California, Oregon, and Washington ........................................................................ 3

– If two setae are present on mentum tooth, then they are at base of tooth, well posterior of apex; geographic range eastern United States west to Missouri and Texas .............................. 4

3. Male profemur with a spine on ventrobasal face ( Fig. 4A, C ); male protarsus with tarsomeres 1 and 2 strongly asymmetrically dilated (Fig. 5); female genitalia with a field of long bifurcate setae scattered throughout the apical region of laterotergite IX ( Fig. 6 ); geographical range Pacific Northwestern Unit- ed States (Oregon and Washington)........................ Medusapyga LaBonte and Maddison

– Male profemur without a spine on ventrobasal face; male protarsus with only tarsomere 1 dilated; each lateral tergite of female genitalia with a field of simple setae on the venter along medial or apical edges; geographical range California ............................................ Anillodes Jeannel

4. Both sexes with apical margin of last visible abdominal ventrite evenly arcuate; right paramere present; geographic range eastern United States west to Missouri and Texas ............... Anillinus Casey

– Male with apical margin of last visible abdominal ventrite toothed; right paramere apparently absent; geographic range southeastern United States................................. Serranillus Barr

Figures

Figure 6. Female genitalia of Medusapyga alsea from the type locality, ventral view. (A) Overview of voucher V101505. Scale bar 100 µm. (B) Closeup of voucher V101504, showing bifurcate setae on laterotergites. Scale bar 50 µm.

FIGURE 2. Dorsal habitus. (A) Medusapyga alsea, female. (B) M. chehalis, female. Scale bar 1 mm.

FIGURE 4. Left profemora, anterior view. (A) Medusapyga alsea, male. (B) M. alsea, female. (C) M. chehalis, male. (D) M. chehalis, female. Scale bars 100 µm.