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Forewing Length: 17-20mm;
Wingspan: 35-40mm
| Egg | Larva | Pupa | Adult | 
| ? | May - July | (Winter) | February - April (Earliest: 27.2)  | 
| Biotopes: | 
 
Wet Forest  | |
| 
Food: (Larva)  | 
 
Betula  | |
| Parasitoids: | 
 
Several Ichneumonidae Larvae  | 
 
Siphona pauciseta Larva  | 
| Other Possible Parasitoids: | 
 
Several Ichneumonidae Larvae  | 
Catalogue of the Lepidoptera of Belgium:
Achlya flavicornis
Achlya flavicornis
Nature Spot:
Yellow Horned - Achlya flavicornis
Lepiforum:
Achlya flavicornis
Plant Parasites of Europe:
Achlya flavicornis
Pictures © 2003 J.K. Lindsey, 2019 R. Thunus
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