|Pterostichus oblongopunctatus Linnaeus, 1758 Notable B|
|A widely distributed but mostly northern species with records
widely scattered (Luff), very sparsely recorded in the south east. An insect of broadleaved
woodland, preferring open woods on dry soils (Luff) ¹. Nearly always found under bark but they are adventitious
nocturnally, our specimen was found running on a pathway in Whippendell wood around midnight. Adults occur
throughout the year. When recording in this type of habitat these medium sized black Pterostichus must be
examined with a lens, P.madidus is often so common that other species e.g. oblongopunctatus and angustulatus
may be passed over for them.
9.5-12.6mm. Very shining black with faint metallic lustre, brassy or rarely bluish or greenish. Tibiae, tarsi and palpi brown, usually dark. Eyes prominent, two supra -orbital punctures on inside margin. Mandibles long and sharp, symetrical, but not so developed as in Stomis. Antennae pubescent from 4th segment, 1st slightly shorter than third (P.angustatus Duft). Basal segments without keel dorsally (Poecilus spp.). Pronotum glabrous and impunctate but for area around basal depression. Base almost straight to sharp hind angles, sides sinuate and bordered (almost) to front angles (P.adstrictus Esch.), with a single elongate and rugosely punctate basal fovea. Elytra a little less shining than pronotum, with epipleurs crossed and usually four small fovea joining stria 2 or 3, sometimes more, up to seven. With complete shoulder stria and scutellar stria obvious. Apex of first stria with three small setiferous punctures (angustatus Duft.). Legs long and stout, tibial spurs well developed. Tarsal segments smooth and glabrous above, without furrows. Claws smooth (cf. Calathus).
¹ But Hyman and Parsons state "All types of soil".
Description from 1 Watford Specimen at X20