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70.134 ~ 1804 ~ Barred Rivulet ~ Perizoma bifaciata
UK Status

Resident. Local S,C(N).

Montgomeryshire Status

A local and rare species. In recent times it has only been recorded at two sites in the west of the county.

Wingspan :  M & F, 20-26mm.

Confusion species

Barred Carpet, Heath Rivulet.
Flight time (Montgomeryshire)


Mainly on chalk downland, also found on open waste ground.


The ripening seeds of red bartsia and occasionally eyebright.

Lifestage data

Overwinters as a pupa underground, sometimes up to 5 years. Larva Aug-Oct living inside the seed capsules until too large, then living on the plant.
Montgomeryshire photos

Photo by AT, 29th July 2015, Derwenlas

Photo by PRW, 6th Aug 2020, Commins Coch