54.001 Jordanita globulariae (Scarce Forester)
ws: ♂23-30mm, ♀19-23mm MBGBI2, fw: ♂12-15mm, ♀10-12mm (Waring & Townsend); Jun-Jul; common/greater knapweed (Centaruea nigra/scabiosa); NS-A chalk downland in Wiltshire and Sussex
ID: The 3 Forester species are very similar. Adscita geryon (Cistus Forester) is smaller (ws: m19-25mm, f18-22mm, fw: m10-12mm f 9-10mm) but otherwise externally identical to A.statices (Forester). Jordanita globulariae (Scarce Forester) differs in antennal detail: in male A.statices the apex is thickened and obtuse and the apical 9-11 segments lack pectinations; in male J.globulariae the apex is tapered and pointed and only the apical 3 segments lack pectinations. In female A.statices the antenna is gradually thickened towards the apex and narrowed towards the base; in female J.globulariae the antenna is of uniform thickness.
§1 Lewes Down, East Sussex; 13/06/2020; male; fw 12.9mm
§2 Lewes Down, East Sussex; 13/06/2020; male; fw 12.3mm
All images © Chris Lewis
§2 Lewes Down, East Sussex; 13/06/2020; male; fw 12.3mm
All images © Chris Lewis
Page published 15/06/2020 (§1-2)