70.238 Selenia lunularia (Lunar Thorn) 1918
fw: 16-22mm; May-Jun, occasionally bivoltine Jul-Aug; several broad-leaved trees and shrubs; local in open woodland and scrub throughout GB and suspect migrant.
ID: Similar to S.tetralunaria (Purple Thorn). Distinguished by presence of a dark central spot on hindwing upperside near termen in S.tetralunaria and its absence in S.lunularia; central silver crescent in median fascia of forewing is obviously larger in S.tetralunaria; distal edge of median fascia (distal cross-line) is nearly straight in its costal half in S.lunularia, distinctly bowed in S.tetralunaria; hindwing termen is deeply scalloped in S.lunularia, usually less so in S.tetralunaria.
Page published 04/03/2014 (§1) | §2 added 26/04/2014