Species Account

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Summary Data

Season (Adult / Immature):

National Status: Common

Local Status: Scarce and local resident.

Local Record: Grade 2   See here for explanation

Flight time: Two generations, May-Jun, Aug-Sep.

Forewing: 16-19mm.

Foodplant: St John's-worts.

Regional breakdown:

Year first recorded19261984196119401979
Year last recorded20142014201420142011
Number of records3134615420419
Number of individuals4245918257266
Unique positions301661337
Unique locations331454345
Adult records3104614519419
Immature records00000

For the county, we have a total of 736 records from 140 sites. First recorded in 1926.


70.193 Lesser Treble-bar 04
© Terry Box
70.193 Lesser Treble-bar 03
© Andy Nunn
70.193 Lesser Treble-bar 02
© Dave Williamson
70.193 Lesser Treble-bar 01
© Dave Williamson

Species Account

Sutton & Beaumont, 1989: Skinner (1984) states Yorkshire to be the northern limit of this species and certainly northern County records are very sparse. There is only one recent record from VC62 (Sleightholmedale, 27.7.1984, specimen kept (GWF)) and there is none from VC65 (though it does occur rather uncommonly in Durham, VC66 (Dunn & Parrack, 1986)). In vice-counties 61, 63 and 64, however, it is reported from many sites, being much more frequent in these than A. plagiata (Linnaeus) is in higher areas.

Argus 47, 2001-04:
VC65. High Batts, 19.8.1984 (SPW). NEW VICE-COUNTY RECORD.

2012 (CHF): See comments on Treble-bar on separating these two species. Lesser Treble-bar is the commoner of the two species in the county especially in lowland areas of the south and east, for example there are 220 records on the database from Spurn compared with 12 for Treble-bar.

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