73.119 (2368) The Crescent Helotropha leucostigma leucostigma (Hübner, [1808])

Status
Resident. Local.
UK BAP Priority Species.
 
Flight period
J F M A M J J A S O N D
























 
History
Lennon (1863) stated that it was not common, but that it had occurred at Tinwald Downs (VC72). Sir Arthur Duncan (1909-84) during his lifetime had found it at Closeburn and Tynron (VC72).
 
During 1974-92 just three of the seven Rothamsted stations recorded it and that was only twelve times. The sites were Gatehouse of Fleet and Mabie Forest (VC73) and Caerlaverock (VC72). During regular trapping on the Hensol Estate/Laurieston in the early 1980s it was recorded just six times.
 
During a three day visit in August, 1987, Bernard Skinner found it at Sandhead, the first record for Wigtownshire. It has been record twice more, Tony Davis found it at Torrs Warren in 1997 and Arthur Ewing trapped it on Forest Moor in 2006.
 
From 1992-2001 forty records came from Kirkton (VC72), with Castle Loch at Lochmaben (VC72), Auchencairn and Mersehead RSPB (VC73) being the next most popular sites, but covering up to 2010. A small scattering of further records, 1992-2010, were mostly from Kirkcudbrightshire.
 
Life cycle
One generation. Overwinters as an egg. Larvae are present during March to July, where it feeds inside the leaves, stems and roots of its foodplants.
 
Larval fooplants
Larvae feeds on Yellow Flag Iris and Great Fen Sedge, though the latter species is rare in Dumfries and Galloway. Possibly also Purple Moor-grass.
 
Identification
The narrow, rather crescent-like kidney-mark on dark chocolate-brown or reddish-brown forewings, with a whitish line running from the oval to the kidney-mark where it forks should aid identity.
 
Habitat
Fens, marshes, reedbeds and wet woodland.
© Keith Naylor, Mersehead RSPB, 18 August 2006

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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