Species Account

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Summary Data

Season (Adult / Immature):

National Status: Local

Local Status: Scarce and very local resident.

Local Record: Grade 4   See here for explanation

Flight time: One generation, Jun-Jul.

Forewing: 18-21mm.

Foodplant: Grasses.

IMPORTANT - Please note that the maps and accounts are provisional, subject to change and further update.  The whole dataset still needs to go through the final verification process and it is likely that a very small number of records will not satisfy the present requirements and there are other records that have not been formally submitted.  The information is for guidance only.

Record breakdown:

Year first recorded189219971892
Year last recorded201120022011
Number of records1814370
Number of individuals52351056
Unique positions743154
Unique locations553116
Adult records1734354
Immature records000

For the region, we have a total of 370 records from 116 sites. Earliest record on file is in 1892.


2323 Reddish Light Arches 02
© Tom Morris
2323 Reddish Light Arches 01
© Phyl England 20 Jul 2012

Species Account

For further information refer UK Moths.

Davey, P., 2009: A species confined mainly to south-east England where it is local, the larva feeding on the lower stems and roots of various grasses. In Dorset, the moth occurs in two biotypes. On unimproved chalky grassland it is local and rarely common; for example there is a strong colony at Durlston but there have been no recent records from Portland. Singletons encountered in the Poole Basin suggest colonisation of acid grassland, but in these situations it is rare. Dispersed singletons occasionally turn up elsewhere.

The moth is similar to Light Arches2322. Diagnostics include: a tawny ground colour, not straw-coloured; an almost continuous sub-terminal line bounded by short black streaks, not dots; a squarer moth more akin to a Clouded-bordered Brindle2326, less like a Pale Pinion2236; tawny-coloured thorax.


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