Treble-bar Moth

Aplocera plagiata

The Treble-bar moth, one of the largest Geometrid moths, is very similar to the Lesser Treble-bar (see below).

Caterpillars live on St John's Wort, giving the moth its alternative name of St John's Wort Inchworm.

Lesser Treble-bar Moth

Aplocera efformata

The Lesser Treble-bar moth is very similar to the Treble-bar, but the first brown bar nearest the head is angular rather than roundly curved.

If the two moths are side by side, then other minor differences may be apparent: slightly smaller size, slightly paler background, male has less pointed body.