Species Account

Select species and region:



Summary Data

Season (Adult / Immature):

National Status: Common

Local Status: Abundant and widespread resident.

Local Record: Grade 1   See here for explanation

Flight time: One generation, Jun-Aug, (Sep-Nov).

Forewing: 19-26mm.

Foodplant: Grasses.

Regional breakdown:

Year first recorded19291930190918861940
Year last recorded20142014201420142014
Number of records125775099508684041636
Number of individuals10265847542284179900717458
Unique positions239274326396100
Unique locations23425631840595
Adult records124794969490980741611
Immature records165114

For the county, we have a total of 32802 records from 1308 sites. First recorded in 1886.


73.162 Dark Arches 06
© Nick Lawman
73.162 Dark Arches 05
© Andy Nunn
73.162 Dark Arches 04
© Lee Wiseman
73.162 Dark Arches 03 f. aethiops
© Alan Draper
73.162 Dark Arches 02
© Charles Fletcher, 18 Aug 2005
73.162 Dark Arches 01
© Alan Miller

Species Account

Sutton & Beaumont, 1989: One of our commonest moths, recorded widely over all five vice-counties, well up the valleys and on the higher ground. Dark specimens are frequent, for instance at Harmby near Leyburn (VC65) approximately fifty percent of moths are reported to be melanic (FBS pers. comm.). However, no recorders have specified which form (ab. infuscata (White) or ab. aetbiops (Staudinger)) has been noted.

2012 (CHF): Extremely common and widespread all over the county in a variety of habitats. Numbers are stable. Some of the biggest counts come from upland grassland areas eg 535 at Ballowfields LNR in Wensleydale on 6.8.2010.

See background to species accounts.  Index of Vernacular names - Search - Random Species