Description: Wingspan 34-40mm. Adults are dark grey-brown. The forewing has a white stigma which is shaped like the figure eight, from which the moth gets its name. There is also a chequered fringe and a dark tornal dash to the forewing. The hindwing is pale ochreous grey with a central discal mark. Adults have only been recorded during October in N.Ireland.

World Distribution: Throughout Europe as far east as Asia Minor.

Irish Distribution: Widely distributed but rather local; the majority of recent records are from well-trapped sites such as Brackagh Moss NNR, Oxford Island NNR and Peatlands Park, Armagh. It is possibly under recorded in other parts of Armagh and Fermanagh.

Ecology: An autumnal species mainly associated with woodland clearings and old mature hedgerows. Adults are attracted to light but are never seen commonly, even at many of its well-known sites. The larvae have been found on Blackthorn Prunus spinosa and apple Malus spp. in N. Ireland; other known foodplants include Hawthorn Crataegus monogyna. May to July is the best time to look for larvae. It overwinters as an egg.

Key Identification Features:

• Flight period
• White figure eight stigma
• Chequered fringe

Distribution Map from NBN: Diloba caeruleocephala at National Biodiversity Network mapping facility, data for UK.

iNaturalist: Diloba caeruleocephala at iNaturalist World Species Observations database.