70.192 (1867) Treble-bar Aplocera plagiata plagiata (Linnaeus, 1758)

Resident. Scarce.
Flight period

The earliest notification of this species is published in Stephens (1829) with the Rev. William Little recording it at Raehills (VC72) just the once.
Somerville (1858) listed it as occurring near Moffat (VC72). Lennon (1863) stated it was not common, but that he had found it at Glen Mills (VC72). Robinson-Douglas (1874) stated it was fairly common around Almorness (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) had found it frequent on the moors around Corsemalzie, Garheugh and Alticry Glen (all VC74) during July. Earliest date was 12th July 1905.
Russell (1944) while staying at Gatehouse of Fleet during 1942-43 had found it locally on his walks. Sir Arthur Duncan (1909-84) during his lifetime had found it at Tynron (VC72).
During 1976-77 there were four records from the Bridge of Dee Rothamsted station with singles at the Gatehouse of Fleet and Newton Stewart sites.
From 1988 to 2010 there are thirty-three records, mainly from Kirkton, Durisdeer, Carsluith and Corserig Hill at Kelloholm, with others from Dob's Linn and Carrifran Valley in the east to Mull of Galloway and Port Kale in the west.
Life cycle
Two overlapping generations. Overwinters as a larva during September to July. Pupation takes place underground.
Larval foodplants
St John's-worts.
The sub-basal fascia has a gentle curve and is not so acutely angled as in the Lesser Treble-bar. Abdomen shape is the key diagnostic feature though, it is very pointed in the male and this will need to be viewed from underneath, as will the female abdomen which is extremely pinched in, then bulbous, and then straight-sided at the tip.
In ssp. scotica the ground colour is bluish grey.
A wide variety of dry, well drained habitats.
Recorders' notes
It is unknown which race occurs here. Recording the sex would help our knowledge.
© Richard Mearns, Kirkton, 19 August 1993

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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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