The Moths of Suffolk
1659 Yellow Horned, Achlya flavicornis, (Linnaeus, 1758)

National Status : Common

Local Status : Resident (SMP Status 1)

Distribution and abundance : Reasonably widespread, although predominantly found in the Brecks and the Sandlings. Can be appear at light in large numbers where it does occur

Habitats : Heathland, grassland and woodland containing birch

Flight Period : Single-brooded; late February to mid-April

Larval foodplants : Downy and Silver Birch

Comments : Possibly under-recorded due to its early appearance in the season

Morley's Final Catalogue : Occasionally taken in Suffolk (Gr). This species' apparent rarity may be in part owing to its early debut: 26 February in 1897 at Copdock, where it was annually found in March (Hkg). It is, perhaps, more often bred from the June larva on birch. Scattered sparsely across the County from Downham (Norgate) and Tuddenham (Wrt, Wrn) to Holbrook Park (Garrett) and Bentley Woods (Harwood), wherein it certainly persists (Baylis, Pyett) to 1936 (Bp.) though rarely seen. Sometimes flying in midday sun, e.g. at Blythburgh Wood on 22 March 1936 (Btn).

Wingspan details : Forewing 17-20mm, Wingspan 39-44mm

Identification

Confusion species
    AdultPoplar Lutestring, Tethea or

Compare confusion species
    Adult

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Ipswich, Suffolk (ii.2003) © N Sherman

Flight chart
JFMAMJJASOND
100 1

Life history chart
JFMAMJJASOND
pupa pupa pupaimago ovapupaimago larva larva larvapupa pupa pupa pupa pupa pupa

Further Photographs

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Ipswich, Suffolk (iii.2004) © N Sherman
Unusual dark marked form - Captain's wood, Sudbourne, Suffolk (iii.2006) © Neil Sherman
Female - Wolves Wood, Suffolk (17.iii.2007) © A Prichard
 
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Ipswich, Suffolk (20.iii.2010) © Neil Sherman
Found on top of moth trap under Birch tree - Ipswich, Suffolk (27.vi.2010) © Neil Sherman
VC25, Waveney Woods Fritton, Suffolk (15.iii.2010) © Brian Jones
 
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Ipswich, Suffolk (12.iii.2011) © Neil Sherman