Ichneumon stramentor


Length 13 to18 mm. Female - Long tapered abdomen, first half yellow and rear half black, with yellow spot at the tip (both on the top and beneath. Legs have black femora; tibiae are half yellow blending into brown that exceeds to the tarsi. Black thorax (with yellow spot) and black head. Long dark antennae with broad white patch about half way along its length. Wings have a brownish tinge. Male has all dark antennae, no yellow spot to the tip of the abdomen but can't be easily distinguished from other similar species.

Identification difficulty

Female , Male

ID guidance

Females - your specimen should have these features:

  • all yellow abdominal tergites 2 and 3
  • a yellow tip to the andomen
  • clear yellow bands in the middle of the hind tibia
  • pale bands on the antennae

Meadows, hedgerows and woodland edge.

When to see it

April to July.

Life History

The larva parasitise the Large Yellow Underwing and Setaceous Hebrew Character moth caterpillars (possibly others), the adult wasp lays its eggs inside the caterpillar, the developing larva then eats it from the inside.

UK Status

Probably quite frequent, but little recorded in Britain.

VC55 Status

Status in Leicestershire and Rutland not known.

Leicestershire & Rutland Map


Yellow squares = NBN records (all known data)
Coloured circles = NatureSpot records: 2020+ | 2015-2019 | pre-2015

UK Map

Species profile

Species group:
Bees, Wasps, Ants
Records on NatureSpot:
First record:
02/05/2013 (Peacock, H A)
Last record:
29/04/2023 (Nicholls, David)

Total records by month

% of records within its species group

10km squares with records

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