Butterflies of Norfolk

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Hans Watson Butterflies of Norfolk

Copyright Compiled by Norfolk & Norwich Naturalists Society All photographs copyright of original authors. Bibliography For more information on Norfolk butterflies please see: Millennium Atlas of Norfolk Butterflies BR Watts and BJ McIlwrath (2002), Butterfly Conservation Norfolk Branch www.norfolk-butterflies.org.uk Recording Records of Norfolk butterflies should be sent to the county recorder. e-mail: recorder@norfolkbutterflies.co.uk Cover illustration: Swallowtail (Hans Watson) Revision date 9.7.14

Alan Dixon Small Skipper Thymelicus sylvestris Widespread and common across Norfolk. Look for the orange undersides to the tips of the antennae to distinguish this species from Essex Skipper. Flight period: mid-june to early September Hans Watson Derek Longe Essex Skipper Thymelicus lineola Formerly rare in the county, this species expanded its range across the whole of Norfolk during the 1990 s. Look for the glossy black tips to the underside of the antennae to distinguish this species from Small Skipper. Flight period: late June to late August Overwinters as an egg. Large Skipper Ochlodes faunus Widespread and common across Norfolk, this species is on the wing a couple of weeks earlier than the preceding species. Look for the dusky shading at the outer margin of the wings and pale greenish undersides spotted with pale yellow. Flight period: late May to August

Dingy Skipper Erynnis tages This species is in serious decline, and in Norfolk is restricted to sandy sites in the west of the county. Flight period: May/June with partial second brood in August Derek Longe Grizzled Skipper Pyrgus malvae A colonial species, favouring scrubby sites with bare ground and sparse vegetation. In Norfolk, it is restricted to the west of the county except for one site on the north-east coast. Flight period: late April to late June. Overwinters as a chrysalis. Derek Longe

Swallowtail Papilio machaon The Swallowtail is the largest British butterfly and can be seen over reed and sedge beds throughout the Norfolk Broads. Wheatfen (Ted Ellis Trust), Strumpshaw (RSPB), Hickling (NWT) and Catfield Fen (Butterfly Conservation) are all good sites. Hans Watson Flight period: Mid-May to late July with partial second brood in August. Overwinters as a chrysalis. Hans Watson

Brimstone Gonepteryx rhamni Widespread across Norfolk, this yellow butterfly is a classic harbinger of Spring, but at rest it always settles with closed wings. Look for the reddish brown spot in the centre of the lower wing to distinguish this species from the Whites. Flight period: overwintering adults emerge in first warm days of spring and survive until June. Their progeny emerge in July/August and fly till late autumn before hibernating for the winter. Tony Howes Large White Pieris brassicae Commonly named the Cabbage White, look for the large black patches in the apex of the upper wing of both sexes. Males have clean white upper sides to the wings (apart from the apical patches), females have bold black spots. Both sexes show black spots on the underside. Flight period: First brood emerges in mid-april, second brood in mid- June, numbers being swollen by immigrants from the continent. Overwinters as a chrysalis. Hans Watson

Derek Longe Tony Howes Derek Longe Small White Pieris rapae The patches at the apex of the wings are not so prominent as those of Large White; the wing spots are greyer, and are present in both males and females. The underside of the wing is uniformly white or pale yellow, lacking the grey/ green veins of the Green-veined White. Flight period: First brood emerges from mid-march, second brood from July. Overwinters as a chrysalis. Green-veined White Pieris napi Unlike the previous species, the Green-veined White is not a pest of garden crops. The main caterpillar food plants are Garlic Mustard and Lady s Smock. Flight period: First brood emerges in mid-april, second brood in July. Overwinters as a chrysalis. Orange Tip Anthocharis cardamines Males are readily identified by the bold orange patches on the forewing, but these are absent in the females. Look instead for the mottled pattern of black and yellow scales on the underside of resting insects. Flight period: April to June. Overwinters as a chrysalis.

Derek Longe David Richmond Alan Dixon Green Hairstreak Callophrys rubi Widespread across Norfolk, but with a preference for gorse covered heathland, where the territorial males will often perch on favoured bushes waiting for passing females. The upper wing is dark brown. Flight period: mid-april to end of June. Overwinters as a chrysalis. Purple Hairstreak Neozephyrus quercus Widespread across Norfolk but rarely seen because they keep to the tree tops. The classic location for viewing this species is from the top of the gazebo at Sheringham Park (National Trust). It will sometimes bask with its wings open, revealing a beautiful purple sheen to the upper wing of the male. Flight period: early July to early September. Overwinters as an egg. White-letter Hairstreak Pieris rapae Look for this elusive insect flying round the tops of hedgerow elms, where it feeds on the honeydew secretions of aphids, occasionally coming down to nectar on brambles. Flight period: early July to mid August. Overwinters as an egg.

Small Copper Lycaena phlaeas Widespread and common across Norfolk, occupying a wide range of habitats, where it flies fast and low to the ground. Flight period: 1 st brood May/June, 2 nd brood July to early September, 3 rd brood late August to October. Tony Howes Brown Argus Aricia agestis Formerly restricted to the brecks and the coastal fringe of north-west Norfolk, this species has expanded its range since the mid-1980 s to occupy the whole of the county. Easily confused with female blues, it is best identified by its small size, and crisply defined orange spots along the whole outer margins of both wings, and by the dark discal spots in the centre of the forewings. Flight period: First brood May/June, second brood August/September. Hans Watson

Silver-studded Blue Plebejus argus Not many years ago, this heathland specialist was restricted to Horsford and Buxton Heaths, but thanks to successful translocation projects by the Norfolk Branch of Butterfly Conservation, it can now be enjoyed on Cawston and Kelling Heaths as well. Look for the thick black border edging the blue wing. Flight period: late June to early August. Overwinters as an egg. Derek Longe Common Blue Polyommatus icarus Widespread and common across Norfolk. Look for the thin black line between the blue and the white on the upperside of the male. Females are brown with blurred orange spots along the outer margin of the wing (cf Brown Argus). Flight period: First brood May/June, second brood August/September. Derek Longe

David Richmond Chalkhill Blue Polyommatus coridon In the 19 th century this butterfly was reported as very local on chalk grassland in the vicinity of Snettisham, Hunstanton and Ringland but it became extinct in the 20 th century. A small colony became established at Warham Camp following an introduction in 1970, but did not persist. The butterfly was seen again at Warham Camp in 2007, presumably after further releases, and is currently increasing in numbers. This new colony is being monitored by Norfolk Branch of Butterfly Conservation. The nearest colony outside Norfolk is at Devil s Ditch, Newmarket, alongside the July Racecourse. Flight period: mid-july to mid-september. Overwinters as an egg. Holly Blue Celastrina argiolus Widespread and common across Norfolk. It looks silvery blue in flight as it explores woodland margins and hedgerows searching for egglaying sites on holly and dogwood in the first brood, and ivy in the second brood Flight period: First brood late March to late July, second brood mid- July to late September. Overwinters as a chrysalis. Hans Watson

White Admiral Limenitis camilla White Admiral was first recorded in Norfolk in 1933, possibly due to deliberate introduction. It is now widely distributed across east Norfolk and the eastern fringes of the brecks. It is a woodland butterfly dependent upon honeysuckle for the caterpillar foodplant. NWT Foxley Wood is a good place to look if you have not seen this species before. Flight period: late June to mid-august, exceptionally with a second brood later in the year. David Richmond Red Admiral Vanessa atalanta The British population of Red Admiral is dependent upon annual immigration to sustain its numbers. It is common across Norfolk in most years, occurring in a wide range of habitats. Flight period: a migrant from the continent first appearing in May. Their progeny fly in August/ September, with a second brood which can survive until November. Only a very few survive winter hibernation as adults. David Richmond

Painted Lady Vaness cardui This is another migrant species, but its numbers are very variable year on year. In good years it is widely distributed across the county, occurring in a wide range of habitats, including gardens. Flight period: a migrant arriving in variable numbers from late May. It is continuously brooded through to the end of September, but does not overwinter in this country. David Richmond Small Tortoiseshell Aglais urticae A once common butterfly, its numbers are subject to periodic declines. It is widespread across the county, and local numbers can be supplemented by immigrants from Europe. Flight period: overwintering adults emerge in first warm days of spring and survive until early May. Their progeny emerge in June/July giving rise to a second brood in August. These fly till late autumn before hibernating for the winter. Alan Dixon

Peacock Inachis io Widespread and common across Norfolk. Against the light, the butterfly looks almost black in flight, because of its very dark underside. Flight period: overwintering adults emerge in first warm days of spring and survive until May. Their progeny emerge in July and fly till late autumn before hibernating for the winter. Hans Watson Comma Polygonia c-album Widespread across Norfolk, the main habitat is woodland and woodland margins, though it can frequently be found in gardens where there are good sources of nectar. Flight period: overwintering adults can be seen flying from March onwards. Their progeny begin to emerge from July, the early insects mating to produce a second brood which flies in autumn. These, together with later emerging first brood insects, then overwinter as hibernating adults. Hans Watson

Silver-washed Fritillary Argynnis paphia This species has only recently recolonised the county, and is one to look out for in sunny woodland rides. It is the largest of the fritillary species to be found in Gt Britain. It was widely distributed, but uncommon in Norfolk in the 19 th century, a famous haunt being Foxley Wood. It survived in Norfolk until the later part of the 20 th century, one of the last records being from Felthorpe in 1971. There were spasmodic records in the early 21 st century which were believed to be releases, but then in 2010 there was a major influx with 33 records from 16 tetrads which were believed to be continental migrants or dispersing individuals from Suffolk colonies. It was reported from 22 sites in 2011, mainly in the north-east of the county but also with reports from south of the River Yare. In subsequent years Holt Country Park and Foxley Wood have proved to be reliable sites with good public access. Flight period: mid-june to late August. David Richmond

Dark Green Fritillary Argynnis aglaja In Norfolk, this is predominantly a coastal species with strongholds at Holkham and Horsey dunes. There are occasional inland records, but there is always the risk of confusion with the fast flying, brightly coloured Comma butterfly. Flight period: mid-june to the end of August. Derek Longe Grayling Inachis io In Norfolk, Grayling is an insect of sandy places. Formerly common in the brecks and on inland heaths, it is now more or less confined to coastal localities. Except during courtship, the butterfly always lands with wings closed, and can be extremely difficult to spot when at rest on dry stony ground. Flight period: July to September. David Richmond

Speckled Wood Pararge aegeria Widespread and common across the county, though this has not always been the case. In the mid to late 20 th century it was very much a breckland species restricted to woodland margins. It now occurs in a wide range of shaded habitats. Flight period: there are three overlapping broods so that adults can be seen on the wing from March to October. Overwinters as a caterpillar or a chrysalis. David Richmond Wall Brown Lasiommata megera This species is in serious decline, and in Norfolk is now mostly seen in coastal areas; yet as recently as the last decade of the 20 th century, it was widespread across the whole of the county. It frequently basks on bare ground with wings spread to soak up the sunshine. Flight period: First brood May/June, second brood July to September. Hans Watson

Meadow Brown Maniola jurtina Widespread and common across Norfolk. In former times it was found in traditional hay meadows, but is now restricted to a wide range of unmanaged grassland with plenty of nectar plants. Flight period: June to September. Alan Dixon Ringlet Aphantopus hyperantus Widespread and common across Norfolk, in a wide range of partially shaded, damp grassland habitats, such as woodland rides and riverbanks. Look for the black velvety uppersides of newly emerged adults, contrasting with white wing margins. Flight period: late June to mid-august. Tony Howes

Gatekeeper Pyronia tithonus Widespread and common across Norfolk. Often seen along hedgerows or nectaring on bramble, hence its alternative name of Hedge Brown. Flight period: July/August. Hans Watson Small Heath Coenonympha pamphilus Widespread across Norfolk, though declining. It is a small, orange-brown butterfly, which flies close to the ground and always lands with wings closed. Flight period: there are two or three overlapping broods so that adults can be seen on the wing from May to September. Hans Watson

Clouded Yellow Colias croceus In flight the Clouded Yellow shows a deep yellow upper wing with a thick black border, but at rest it always settles with its wings closed. It is an increasingly regular migrant which arrives in early summer, frequently breeding to produce a new generation later in the year. It has overwintered in southern Britain but there are no such records for Norfolk. David Richmond Camberwell Beauty Nymphalis antiopa An irregular wind-blown migrant from the continent which can occur in late summer following strong easterly winds. Exceptionally it can overwinter as a hibernating adult. Non-resident Migrants Bob Cobb

Checklist of Norfolk Butterflies Print out this page to record your sightings of Norfolk Butterflies. Species Where When Species Where When Small Skipper Chalkhill Blue Large Skipper Holly Blue Essex Skipper White Admiral Dingy Skipper Red Admiral Grizzled Skipper Painted Lady Swallowtail Small Tortoiseshell Brimstone Peacock Large White Comma Small White Silver-washed Frit. Green-veined White Dark Green Fritillary Orange-tip Grayling Green Hairstreak Speckled Wood Purple Hairstreak Wall Brown White-letter Hairstreak Meadow Brown Small Copper Ringlet Brown Argus Gatekeeper Silver-studded Blue Small Heath Common Blue