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The geometrician (Grammodes stolida) is a migratory moth species in the family Erebidae that was first identified and named by Johan Christian Fabricius in 1775.
Physical Characteristics
Wingspan: Measures between 40 and 44 millimeters across.
Appearance: Features dark forewings marked by distinct pale or cream-colored bands.
Distribution and Habitat
Native Range: Found widely across Africa, southern Europe, most of Asia, and Australia.
Migration: Regularly travels into central and northern Europe, reaching as far north as Denmark, Finland, and England.
British Sightings: Considered an extremely rare immigrant in the British Isles, with official records logged only twice—in 1903 in Devon and in 1990 in East Sussex.
Preferred Habitats: In southern Europe, it lives in deciduous woodland clearings, thick scrublands, and waste grounds.
Life Cycle and Behavior
Host Plants: Caterpillars feed on foliage from plants including bramble (Rubus) and oak (Quercus).Flight Period: Adult moths are active from April through October, often appearing in two waves during May–June and August–September.
Attractions: Adults are nocturnal and easily drawn to artificial light sources and sugar baits.
