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: 19-22mm.

Foodplant: St John's-worts.

Regional breakdown:

Year first recorded19401973194018861960
Year last recorded20132007201320142011
Number of records1715398022
Number of individuals15102754552
Unique positions101229409
Unique locations1112284010
Adult records1615287417
Immature records00000

For the county, we have a total of 173 records from 101 sites. First recorded in 1886.


70.192 Treble-bar 05
© Damian Money
70.192 Treble-bar 04
© David Ashton, 17 Aug 2012
70.192 Treble-bar 03
© Paul Holmes
70.192 Treble-bar 02
© Andy Nunn
70.192 Treble-bar 01
© Alan Miller, 2010

Species Account

Sutton & Beaumont, 1989: A rather local species, mostly confined to the high ground in the north and west of the County.

2012 (CHF): There is much confusion separating this species and Lesser Treble-bar. Looking at the angle on the inner cross line is not easy as this feature varies. A better way is to look at the tip of the abdomen in the males (see Waring, Townsend and Lewington). Treble-bar is also usually significantly larger. It seems to be commonest in the north and west of the county. Both species are bivoltine in Yorkshire with the broods peaking in May/June and August.

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