|  | 
Forewing Length: 17-19mm;
Wingspan: 36-46mm
| Egg | Larva | Pupa | Adult | 
| ? | August - May | ? | May - July (Earliest: 18.6) | 
Catalogue of the Lepidoptera of Belgium:
Xestia triangulum
 Xestia triangulum
Xestia triangulum
Nature Spot:
Double Square-spot - Xestia triangulum
Lepidoptera and Their Ecology:
Xestia triangulum
Lepiforum:
Xestia triangulum
Plant Parasites of Europe:
Xestia triangulum
Pictures © 2003 J.K. Lindsey, 2015 R. Thunus
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