Broad-bordered Yellow Underwing Noctuidae

Noctua fimbriata (Schreber, 1759)

Description: Wingspan 50-58 mm. Forewings are usually reddish brown. The males are darker that the females. Forewings are marked with stigmata outlined with a pale fine line, an dark, oblique anterior crossline, a posterior crossline which is paler than the ground colour of forewing and sharply-angled and a dark patch on the costa near the apex of the forewing. Hindwings orange, with a broad black band that tapers towards the inner margin.

Similar Species: Large Yellow Underwing N. pronuba, but this has a discal spot on the forewings and a narrower dark band on the hindwing.

Key Identification Features:

Sets:  male upperside

Flight Period: End of June to mid-September. Adults aestivate after emergence and normally reappear in August.

Status: Generally distributed, and apparently more common in the east, especially in coastal localities. In recent times it has been found more frequently inland, particularly in the north and west. It has also been recorded on Rathlin Island.

Ecology: A large distinctive species found in many habitats. Adults are attracted to light in small numbers. The larvae feed from September to April of the following year on Blackthorn Prunus spinosa, willow Salix spp. and dock Rumex spp. It overwinters as a larva.

World Distribution: Western Europe from Finland, south to Portugal.

Bradley & Fletcher number: 2110 Agassiz number: 73.343

Additional information:

UK Moths account


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