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Subspecies
The species is variable as to the structure of the mesonotum and this variation shows partially a correlation with geography; this could indicate that subspecies are present. Because the species is so rarely collected, the description of subspecies requires the availability of more material. Currently, no subspecies are recognized.


Original description
Original spelling: Helorus nigripes

Foerster A (1856). Hymenopterologische Studien, II. Heft: Chalcidiae und Proctotrupii. Verlag von Ernst ter Meer, Aachen (p. 143).

Locus typicus: Not specified in the original publication, but probably Aachen (Germany) where Förster lived. Whereabouts of the type(s) unknown.


Synonyms
Helorus ater Jurine, 1807 (nec Latreille, 1802) (a misidentification)

Bethylus ater (Jurine, 1807)

Helorus nigripes Foerster, 1856 (p. 143)
Helorus rugosus Thomson, 1858
Helorus obscurus Pschorn-Walcher, 1955 (after a label by Förster) (nomen nudum)


Identification
Forewing length 3,7-4,3 mm. The largest species in Germany and easily identified by the wrinkled and corrugated structure of the head and thorax.


Distribution
A rare species. Recorded from Switzerland, Denmark, Sweden, the Netherlands, Belgium, Germany, Austria, Czech Republic, Hungary, Bulgaria, Ukraine, France, UK. Also recorded from Moldova.
Germany: Niedersachsen, Nordrhein-Westfalen, Baden-Württemberg, Brandenburg and Berlin, Bayern.

Biology
Adults have been collected in April to July. The species parasitizes in lacewings (Neuroptera), so far the following hosts have been recorded: Chrysopa nigricostata, and Chrysopa perla.


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