70.132 (1802) The Rivulet Perizoma affinitata (Stephens, 1831)

Resident. Common.
Flight period

The earliest notification of this species is published in Stephens (1829) with the Rev. William Little recording it at Raehills (VC72).
Buchanan White of Perth (1895) listed it as occurring in Colvend and Southwick parishes (VC73). K. J. Morton of Edinburgh (1900) whilst on a visit in July 1899 to Wigtownshire had found this species in the Monreith area. Gordon (1919) found it fairly common at the coast in Wigtownshire, with a record from Captain J. N. Kennedy at Portpatrick on 15th May 1911.
Sir Arthur Duncan (1909-84) during his lifetime had found it at Closeburn, Tynron and Castlehill, Dumfries (all VC72). Pelham-Clinton during the 1960s had found it at Caulkerbush and Kirkbean. From 1974-93 there were 100s of records from five of the six Rothamsted stations, Caerlaverock being the odd one out.
The records from the mid 1990s increased gradually each year, peaking in 2000 with fifty records, but during the first decade of the 21st century, each succesive year had only produced a handful of records.
Life cycle
Overwinters as a pupa underground. Larvae are present July to early September.
Larval foodplants
Larvae feed on Red Campion flowers and seeds.
The white cross-band with a fine dark line inside it is two thirds the way down the forewing. Near the trailing edge basally there is one rounded indentation that is key. There are two on Small Rivulet.
Open woodland, scrub, hedgerows and other habitats where the foodplant is found. The caterpillar lives wholly concealed within the seedpods of Red Campion, feeding on the seeds
Recorders' notes
Care required to separate from Small Rivulet.
© Keith Naylor, Mersehead RSPB, 22 July 2005

Local distribution map

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Distribution map displays records from the National Biodiversity Network (See terms and conditions).

The following datasets are included:

  • Butterfly Conservation - Macro-moth provisional distribution for the British Isles (excluding the Republic of Ireland) from the National Moth Recording Scheme
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