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Opisthograptis luteolata >

Pachycnemia hippocastanaria (Hübner, [1799])

Horse Chestnut
70.2250 (B&F: 1905)


»Suborder: Glossata
  »Superfamily: Geometroidea
    »Family: Geometridae
      »Subfamily: Ennominae
        »Tribe: Hypochrosini

Number of records: 157
Recorded in: 47 1km grid squares
Date of most recent record: 19 ix 2024
Identification 
difficulty 
: 2Species where care is needed for identification. Should not present any difficulty for experienced recorders, but inexperienced recorders may be expected to provide additional evidence in the form of photographs of reasonable quality that show as many of the identification features as possible or, alternatively, a specimen. Even experienced recorders may be expected to provide additional evidence if the record is outside of the normal flight period or geographical range of the species.

A resident and suspected occasional immigrant. Normally occurs sparingly at mv light though sometimes fairly common to common on heathland in the west. In serious danger of extinction in the east of the county. Well distributed in the far north-west of the county but very local in numbers. Chiefly known just from Ashdown Forest in the east but in decline. A triple brooded species flying mainly from early April to late May, more numerously from late June to early August, the again less frequently throughout August. The larvae feed on heather. (Pratt 2011)

Pachycnemia hippocastanaria
Iping Common, 24 vi 2017
Photo: Colin Knight
Pachycnemia hippocastanaria
Burton Mill Pond, 1 v 2025
Photo: Colin Piper
Pachycnemia hippocastanaria
Ambersham Common, 23 viii 2013
Photo: Mike Snelling
Pachycnemia hippocastanaria
Pulborough Brooks RSPB, 25 vii 2026
Photo: Anthony Bennett
Pachycnemia hippocastanaria
Ambersham Common, 14 viii 2010
Photo: Derek Lee
Pachycnemia hippocastanaria
Burton Mill Pond, 19 ix 2024
Photo: Colin Piper
Pachycnemia hippocastanaria
Bracklesham, 30 ix 2013
Photo: Derek Lee
Pachycnemia hippocastanaria
Wych Cross, Forest Row, 17 iv 2014
Photo: Hew Prendergast

Gallery

Distribution at 1km scale

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distribution map

Phenology (adult)

phenology
phenology
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phenology
phenology

Phenology (larval)

larval phenology
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