|scientific name Patrobus stygicus |
Borders of standing and slow running water, on soil often peaty and dense vegetation present.
Adults of this species have been collected from May to September.
Similar to fossifrons, differing in the following points: more slender, especially prothorax; tibiae usually darker, at least in outer half; prothorax with longer, almost parallel-sided constriction at base, anterior transverse impression, often entirely diappeared, impunctate; and elytral microsculpture clearly transverse. Elytral microsculpture transverse. Length 8.3-12 mm.
Overwinters in the both larval (predominant) and adult stages.
Both larvae and adults are predatory.
This species is found in Alaska and Wyoming, and northeastern Unites States, and most of Canada. In Alberta this species is found throughout the province.
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