Scientific name: Lasiocampa trifolii
August to September. A nationally scarce moth with restricted populations in England and Wales.
The Grass Eggar is reddish-brown in colour with a curved outer cross-line on the forewing and a central white spot. The colour varies with location. The pale form f. flava is a straw or brownish yellow with similar markings.
The adults are incapable of feeding. They fly at night and are attracted to light. The caterpillars can be found from March to July feeding at night. They pupate in a tough brown cocoon on the ground. They overwinter as eggs laid loosely among vegetation.
Size and Family
- Family – Eggar moths (Lasiocampidae)
- Medium / Large Sized
- Wingspan Range – 42-60mm
- UK BAP: Not Listed
- Grass Eggar - Nationally Scarce A
- Pale Grass Eggar – Red Data Book species
Caterpillar Food Plants
Foodplants vary between areas including False Oat-grass (Arrhenatherum elatus), Tree Lupin (Laburnum arboreus), Marram (Ammophila arenaria), Bramble (Rubus fruiticosus) and Creeping Willow (Salix repens).
Sand dunes with light vegetation, sea cliffs, coastal shingle and acid heathland
- Countries – England and Wales
- Grass Eggar – Nationally Scarce A. Found very locally on sand dunes on Scilly, in Dorset, Hampshire, Somerset, Glamorgan, Cheshire and Lancashire, and on sea cliffs in south Devon and Cornwall. Also heathland in Dorset. Widespread and frequent in the Channel Islands.
- Pale Grass Eggar – Red Data Book Species. Found in Kent.