|scientific name Pterostichus adstrictus |
Open country with low moisture, common in cultivated fields, not found in forest or tundra.
Adults collected May to October.
Member of the adstrictus group, (subgenus Bothriopterus). Black, often faintly bronzed in males, elytra dull in females with slightly paler appendages. Rare reddish specimens collected as aberrations except in the Aleutian Islands where they are common. Prothorax with short and shallow, or no sinuation before the somewhat denticulate hind angles, reflection of sides more or lwss widening basad; latero-basal impression separated from side margin by a convexity that is little pronounced, or at least, does not form a direct continuation of the pronotal disc. Elytra with 5 or 6, rarely 4 dorsal punctures, more or less irregularly placed with foveate stria. Antennal cleaner of fore-tibia with 3 clip setae. Length 9.5 to 13 mm.
Immature adults common in late summer, overwinter as adults.
Both larvae and adults are predatory.
Holarctic, widely distributed in United States and Canada. In Alberta this species has been collected thoughout most of the province.
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