Small Engrailed Geometridae

Ectropis crepuscularia (Denis & Schiff., 1775)

Description: Wingspan 38-44mm. Adults are single-brooded and variable in colour and pattern although individuals of this species tend to be lighter. Date of capture is a contributing factor in determining identification (see Engrailed).

Similar Species: The Engrailed E. bistortata flies earlier. Genital examination is recommended for specimens taken from areas where no previous records exist.

Key Identification Features:

Sets:  male upperside

Flight Period: Generally from the beginning of May to the end of June, occasionally early July.

Status: Widespread across southern counties, sporadic further north. More commonly encountered than the scarcer Engrailed E. bistortata. Recorded frequently from well-trapped localities such as, Belvoir Park and Lackan Bog Down, also Annagarriff Wood and Brackagh Moss Armagh and Crom Estate, Florencecourt and Monawilkin Fermanagh.

Ecology: A species normally associated with woodland, bogs, limestone uplands and other scrubby areas. Adults unlike the Engrailed are not as attracted to light and seldom appear in any numbers. The larvae can be found in July and August on birch Betula spp., larch and willow Salix spp. It overwinters in the pupal stage.

World Distribution: Across Central Europe.

Bradley & Fletcher number: 1948 Agassiz number: 70.270

Additional information:

UK Moths account


 Thompson, R. S. & Nelson, B., 2003 (Oct 2). [In] The Butterflies and Moths of Northern Ireland