73.312 (2080) Square-spot Dart Euxoa obelisca grisea (Tutt, 1902)

Status
Resident. Rare.
Nationally Scarce.
 
Flight period
J F M A M J J A S O N D
























 
History
Lennon (1863) stated that it was very rare, but that it had occurred at Tinwald Downs (VC72). As this is a coastal species, this record is doubtful. However, Evans (1915) during 1914 had received three specimens caught on three separate occasions, in aid of his moth migration survey, from D. A. Mowat, keeper at Killantringan Lighthouse (VC74). How reliable these records are is unknown but at least they are coastal.
 
Since then, Sir Arthur Duncan caught one at Torrs Warren in 1984, with another found at Torrs Heughs, Sandyhills, on 11th August 2001. A further two were caught at Mullock Bay, Dundrennan, on 22nd August 2003, and two more were caught at Mersehead RSPB on 18th August 2006, all of these were verified by K. P. Bland, NMS.
 
Life cycle
One generation. Probably overwinters as an egg. Larvae are present from February to March, with pupation taking place underground in July.
 
Larval foodplants
Various low-growing plants, but not known fully.
 
Identification
Compared to White-line Dart the outer cross-line is more prominent and touches all along the edge of the kidney-mark.
 
Habitat
Coastal sites. Although Waring et al. (2009) states that it appears to be absent from flat sandy coasts, the Mersehead records prove this to be an erroneous statement.
 
Recorders' notes
Specimen or quality photo required for record acceptance.
© Keith Naylor per A B Duncan, Torrs Warren, 1984 

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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