Serranillus

Sokolov, Igor M. & Carlton, Christopher E., 2008, Two new species of blind, forest litter-inhabiting ground beetles from the subtribe Anillina (Carabidae: Trechinae: Bembidiini) from eastern U. S. A., Zootaxa 1740, pp. 37-44 : 40

Key for identification of Serranillus species

This key will allow determination of all known Serranillus species.

1. Smaller, under 1.9mm in length. Head relatively larger relative to pronotum (WH/WPm 0.76–0.78)......... Serranillusdunavani (Jeannel)

- Larger, over 2.0mm in length. Head smaller relative to pronotum (WH/WPm 0.72–0.74)........................2

2. Median lobe with gradually narrowing apex with the subacute tip. Beetles from the middle Appalachian Mountains (Virginia)........................................................................ Serranillus septentrionis , new species

- Median lobe with subparallel apex with slightly enlarged and rounded tip. Beetles from southern Appalachian Mountains (North Carolina)........................................................................ Serranillus jeanneli Barr