Bryelmis, Barr, 2011

Barr, Cheryl B., 2011, BryelmisBarr (Coleoptera: Elmidae: Elminae), a New Genus of Riffle Beetle with Three New Species from the Pacific Northwest, U. S. A., The Coleopterists Bulletin 65 (3), pp. 197-212 : 197-212

KEY TO THE SPECIES OF BRYELMIS

1. Pronotal median longitudinal carina prominent; pronotal sublateral carinae explanate and ridge-like, bordered by deep antero-medial depressions; pronotum distinctly wider than long ( Figs. 3, 4 ). Idaho ( Fig. 10 ) ................... .................................................... B. idahoensis

1′. Pronotal median longitudinal carina not as prominent, may be distinct or indistinct; pronotal sublateral carinae bordered by indistinct or shallow antero-medial depressions; pronotum about as wide as long ( Figs. 8, 9 )......2

2. Male genitalia with tips of parameres flared to produce an obtuse angle ( Fig. 7 ); pronotal median longitudinal carina distinct to base; elytra moderately to deeply striate with large punctures, sublateral carinae prominent ( Fig. 8 ). Washington to Oregon ( Fig. 10 )..... B. rivularis

2′. Male genitalia with tips of parameres narrowly rounded, not obtusely angled ( Fig. 6 ); pronotal median longitudinal carina low, often indistinct, more visible anteriorly; elytra lightly to moderately striate and punctate, sublateral carinae not prominent ( Fig. 9 ). Oregon to northern California ( Fig. 10 )....... ....................................................... B. siskiyou

Figures

Figs. 3–4. Habitus of Bryelmis idahoensis. a) Dorsal, b) Lateral. Scale bars = 0.5 mm.

Fig. 10. Known distribution of Bryelmis spp. in North America: B. idahoensis (circles), B. rivularis (squares), and B. siskiyou (triangles).

Figs. 8–9. Habitus of Bryelmis spp. 8) B. rivularis, a) Dorsal, b) Lateral; 9) B. siskiyou, a) Dorsal, b) Lateral. Scale bars = 0.5 mm.

Figs. 5–7. Male genitalia of Bryelmis spp. 5) B. idahoensis, dorsal view; 6) B. siskiyou, dorsal view; 7) B. rivularis, a) Dorsal view, b) Lateral view.