1906 Opisthograptis luteolata (Brimstone Moth)

Geometridae, Ennominae: Wingspan 28-42mm.

A pretty, easily recognisable, species which is widespread and common in the UK, and also through Cornwall.

A prolific species most years, it often produces multiple generations through the year, and many individuals will come to light through its flight season. Because of multiple generations, the main flight season is extended as a broad peak from April to October, although in Cornwall individuals can also be seen as early as February, and slowly increasing numbers in March.