71.018 (2006) Lesser Swallow Prominent Pheosia gnoma (Fabricius, 1777)

Status
Resident. Common.
 
Flight period
J F M A M J J A S O N D
























 
History
Stainton (1859) mentioned Edinburgh as the only Scottish locality for this moth, but Lennon (1864) found four larvae in the Crichton Institution garden, but described it as rare. All Gordon (1913) had to say was that larvae were occasionally taken on birch. Sir Arthur Duncan (1909-84) during his lifetime had found it at Closeburn, Tynron and Castlehill, Dumfries (all VC72).
 
Under ten records were recorded in the earlky 1970s, four Moffat area, with Silver Flowe, Woodhall Loch, Ravenshall and Glen Trool being the others in VC73. But from 1974 to 1982 there just under sixty records from all of the Rothamsted stations, apart from Caerlaverock, with further RIS data from Mabie Forest 1985-90. There were a number of records, also, from the Hensol Estate during 1982-85.
 
From 1992 to 2010 the regular trapped sites at Kirkton, Cally Woods, Carsfad near Dalry, Forest Moor and Old Torr contributed a portion of the 200 records, with the remainder from widespread sites across the region.
 
Life cycle
Two overlapping generations. Overwinters as a pupa underground. Larvae are present June and July, again, late August to September.
 
Larval foodplants
Downy Birch and Silver Birch.
 
Identification
The prominent clean white wedge extending from the apex never reaches halfway across the forewing, this being diagnostic.
 
Habitat
Downland, heathland, moorland and woodland.
 
Recorders' notes
Care required to separate from Swallow Prominent; use the feature above.
© Keith Naylor, Knowetop Lochs SWT, 1 August 2004

Local distribution map

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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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