49.024 Pandemis corylana (Chequered Fruit-tree Tortrix)
ws: 18-21mm (BTM, UK Moths), 18-24mm (Hants Moths); Jul-Aug; various deciduous trees; common throughout GB
Note that §2, with fw 11.8 would have ws 24.5mm
Note that §2, with fw 11.8 would have ws 24.5mm
ID: The 5 British Pandemis species are similar.
P.corylana has an oblique distal margin to the basal fascia so that it is more or less parallel with the proximal margin of the median fascia; marked reticulate forewing pattern; male with whitish crown and frons.
P.cinnamomeana also has an oblique distal margin to the basal fascia; the male has a white frons contrasting stongly with the brown crown; the female has a reddish tinge to the hindwing apex; less reticulate forewing pattern with more 'solid' median fascia than in P.corylana
P.heparana has an angular projection of the proximal margin of the median fascia.
P.cerasana has a transverse distal margin to the basal fascia.
P.dumetana usually has a distinct dark stria from the triangular pre-apical spot towards the tornus; it has a whitish/pale grey hindwing.
Choristoneura species also seem similar and like P.corylana have an oblique distal margin to the basal fascia.
Male Genitalia: All Pandemis species are illustrated in Pierce and Metcalfe and all except P.dumetana are shown at dissection group.
P.heparana is the only one of these species to show a projecting rather than notched apex to the uncus. The images at dissection group show an indented lateral margin to the valva in P.corylana and P.cinnamomeana but not in P.cerasana. From the description in Pierce and Metcalfe it is possible that P.dumetana can be distinguished by the apex of the sacculus projecting slightly from the margin of the valva.
Female genitalia: All Pandemis species except P.dumetana are shown at Dissection Group and illustrated by Pierce and Metcalfe. All species have a substantial thorn-like signum. P.corylana and P.cinnamomeana have an additional two substantial ovate scobinate patches (only one of which is shown for P.corylana in the image as Dissection Group, and only one of which is shown clearly by Pierce and Metclafe for P.cinnamomeana, and they do not mention it in the text). P.cerasana lacks scobinate patches. P.heparana is shown with two small scobinate patches at Disection Group (much less distinct than in P.corylana/P.cinnamomeana) and without them by Pierce and Metcalfe.
P.corylana has an oblique distal margin to the basal fascia so that it is more or less parallel with the proximal margin of the median fascia; marked reticulate forewing pattern; male with whitish crown and frons.
P.cinnamomeana also has an oblique distal margin to the basal fascia; the male has a white frons contrasting stongly with the brown crown; the female has a reddish tinge to the hindwing apex; less reticulate forewing pattern with more 'solid' median fascia than in P.corylana
P.heparana has an angular projection of the proximal margin of the median fascia.
P.cerasana has a transverse distal margin to the basal fascia.
P.dumetana usually has a distinct dark stria from the triangular pre-apical spot towards the tornus; it has a whitish/pale grey hindwing.
Choristoneura species also seem similar and like P.corylana have an oblique distal margin to the basal fascia.
Male Genitalia: All Pandemis species are illustrated in Pierce and Metcalfe and all except P.dumetana are shown at dissection group.
P.heparana is the only one of these species to show a projecting rather than notched apex to the uncus. The images at dissection group show an indented lateral margin to the valva in P.corylana and P.cinnamomeana but not in P.cerasana. From the description in Pierce and Metcalfe it is possible that P.dumetana can be distinguished by the apex of the sacculus projecting slightly from the margin of the valva.
Female genitalia: All Pandemis species except P.dumetana are shown at Dissection Group and illustrated by Pierce and Metcalfe. All species have a substantial thorn-like signum. P.corylana and P.cinnamomeana have an additional two substantial ovate scobinate patches (only one of which is shown for P.corylana in the image as Dissection Group, and only one of which is shown clearly by Pierce and Metclafe for P.cinnamomeana, and they do not mention it in the text). P.cerasana lacks scobinate patches. P.heparana is shown with two small scobinate patches at Disection Group (much less distinct than in P.corylana/P.cinnamomeana) and without them by Pierce and Metcalfe.
§1 New Forest, Hampshire; 30/08/2013; male; fw 8.8mm
§2 New Forest, Hampshire; 04/09/2013; female; fw 11.8mm
§3 New Forest, Hampshire; 31/08/2013; male; fw 9.1mm
§4 Strumpshaw Fen, Norfolk; 25/07/2014; male; fw 9.8mm
§5 Foulden Common, Norfolk; 14/08/2016; male
§6 Pound Wood, Essex; 17/08/2019; male; fw 8.4mm
§7 Pound Wood, Essex; 17/08/2019; female; fw 10.6mm
§8 Pound Wood, Essex; 17/08/2019; male; fw 9.6mm
All images © Chris Lewis
§2 New Forest, Hampshire; 04/09/2013; female; fw 11.8mm
§3 New Forest, Hampshire; 31/08/2013; male; fw 9.1mm
§4 Strumpshaw Fen, Norfolk; 25/07/2014; male; fw 9.8mm
§5 Foulden Common, Norfolk; 14/08/2016; male
§6 Pound Wood, Essex; 17/08/2019; male; fw 8.4mm
§7 Pound Wood, Essex; 17/08/2019; female; fw 10.6mm
§8 Pound Wood, Essex; 17/08/2019; male; fw 9.6mm
All images © Chris Lewis
Page published 13/11/2013 (§1-2) | §3 and more images from §2 added 19/11/2013 | Text amended (female genitalia) 28/03/2014 | §4 added 05/08/2014 | §5 added 16/04/2017 | §6-8 added 17/12/2019