Perizoma bifaciata (Haworth, [1809])

Host plants:
The caterpillars live on Odontites species such as Odontites luteus and O. vulgaris. According to literature, rarely related plants like Euphrasia will be used.

Habitat:
Perizoma bifaciata inhabits particularly wet or dry edges of forest trails, heathlands, woodland clearings and open ruderalized or compacted open soil-rich, often forest-near locations of Odontites vulgaris as well as dry grasslands and sparse pine forests with O. luteus. I found many larvae on the eastern Swabian Alb (Dischingen) and in Upper Swabia (Aichstetten) in more humid forest fringes particularly at forest road edges.

Life cycle:
The pupa winters (sometimes several times). The moths fly quite late especially in August. The caterpillar is found in September and October (peak of older and usually heavily parasitized caterpillars from early to mid-October).

Endangerment: regionally endangered or decreasing

Endangerment factors:
Perizoma bifaciata can be endangered particularly by dense afforestation and the general eutrophication, but is overall probably at least in Southern Germany far more widespread than previously believed.

Remarks:
Perizoma bifaciata occurs in much of Europe and is also found at least in parts of Western Asia.