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Butterfly taxonomy (classification) The skippers The swallowtails The whites The hairstreaks, coppers and blues. Includes the Duke of Burgundy. The nymphalids, fritillaries and browns. Includes the Monarch.
Adonis Blue - Bonchurch Down IOW 27.05.2014
Wingspan
30 - 40mm
Photo © nfreem
Adonis Blue

Polyommatus bellargus
po-lee-oh-MAY-tuss
bell-AH-guss
Number: 61.019
B&F No.: 1576
Family:Lycaenidae (Leach, 1815)
Subfamily:Polyommatinae (Swainson, 1827)
Tribe:Polyommatini (Swainson, 1827)
Genus:Polyommatus (Latreille, 1804)
Subgenus:Lysandra (Hemming, 1933)
Species:bellargus (Rottemburg, 1775)
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  Introduction  

The Adonis Blue is a species of chalk downland, where it may be found in warm, sheltered spots. The male Adonis Blue has brilliantly-coloured blue wings that gives this butterfly its name, and can be found flying low over vegetation, seeking out the less-conspicuous females that are a rich chocolate brown in colour. Like its close relative, the Chalk Hill Blue, the distribution of this species follows the distribution of Horseshoe Vetch which, in turn, follows the distribution of chalk and limestone grassland. However, this species has a more restricted distribution than the Chalk Hill Blue, indicating more precise habitat requirements. This butterfly can be found in large numbers where it does occur, such as the chalk downloads of Dorset, South Wiltshire, West Sussex, East Sussex and East Kent. This species is absent from central England, northern England, Wales, Scotland, Ireland, the Isle of Man and the Channel Islands. This species lives in discrete colonies.

Taxonomy Notes

There is considerable variation in this species, especially with regard to the amount of blue scaling on the upperside of the female. This variation has resulting a number of named subspecies and forms, although only the nominate species is recognised here.

  • Verity (1919) described the English race as ssp. brittanorum, with a type locality of Cuxton in Kent. It was said to differ from the nominate subspecies in the greater amount of blue and smaller and less vivid lunules in the female, and a darker underside that is less frequently tinged with fulvous in the male, the black dots on the underside also being smaller. The description is to be found under Agriades thetis, an earlier scientific name for the Adonis Blue.

  • Verity (1919) also singled out a particular race from Ventnor on the Isle of Wight, which he named ssp. vestae, where the adults were small, the male appearing more silvery and with, in most cases, a series of premarginal black dots, and the female with greatly reduced, sometimes absent, orange lunules on the upperside which are very pale on the underside of both sexes. The underside of both sexes is also very dark.

  • Verity (1934) also described f. antebrittanorum to represent the Spring generation of the English race brittanorum which, according to Verity, is separable by androconial differences.

Polyommatus bellargus

This species was first defined in Rottemburg (1775) as shown here (type locality: Germany).


Adonis Blue male - Mill Hill, Sussex 29-Aug-2013
Male
Photo © Neil Hulme
Adonis-Blue- 5D34448 Larden Chase 23 August 2013
Male Underside
Photo © IainLeach
Adonis Blue female - Mill Hill, Sussex 19-May-2010
Female
Photo © Neil Hulme
Adonis-Blue-Martin Down 21 May 2011 03C0831
Female Underside
Photo © IainLeach

  Phenology  

There are two broods each year. The first adult emergence is in the second half of May, peaking at the end of May and beginning of June. The second adult emergence is in the second half of August, peaking at the end of August and beginning of September.


The chart(s) above have been correlated with the phenology plot below, taken from the UK Butterfly Monitoring Scheme. The blue line gives average counts over the full data set from 1976 to date, and the red line gives the average for the last year.


  Habitat  

This is a warmth-loving species, preferring sheltered, south-facing slopes. This species is found where the turf is closely-cropped, possibly because it provides a higher temperature for the immature stages or because this is a requirement for the ant species that attend the Adonis Blue larva and pupa. The loss of grazing by rabbits, for example, causes the sward to become overgrown and can render a site unsuitable for this species.

  Larval Foodplants  

The primary larval foodplant is Horseshoe Vetch (Hippocrepis comosa).

  Nectar Sources  

Adults feed primarily on Marjoram (Origanum vulgare) and Ragwort (Senecio jacobaea).

  Imago  

The sexes are strongly dimorphic; the males being a magnificent electric blue, and the females being a chocolate brown. The adults live in concentrated colonies and appear to have limited powers of dispersal. However, on good sites, this species can be found by the hundred. This species can be found roosting communally at night.


Adonis Blue - imago - Martin Down - 21-May-08 (10)
Photo © Pete Eeles
21-May-2008
Adonis Blue - imago - Martin Down - 31-May-06 (0186)
Photo © Pete Eeles
31-May-2006
Adonis Blues on horse dung. Ranmore Downs, Surrey. May 1984
Photo © Mikhail
Adonis Blue - Stockbridge Down - 22 Aug 2010 (1)
Photo © Clive
22-Aug-2010
Adonis Blue - Stockbridge Down - 22 Aug 2010 (2)
Photo © Clive
22-Aug-2010
Adonis Blue Pair - Ballard Down, Dorset 5-Sept-10
Photo © Vince Massimo
05-Sep-2010
Adonis Blue Female - Ballard Down, Dorset 9-Sept-10
Photo © Vince Massimo
09-Sep-2010
Adonis Blue - imago - Nr Firsdown - 02-Jun-10 (1)
Photo © Pete Eeles
02-Jun-2010
Adonis Blue - imago - Nr Firsdown - 02-Jun-10 (5)
Photo © Pete Eeles
02-Jun-2010
Adonis Blue - imago - Nr Firsdown - 04-Jun-10 (1)
Photo © Pete Eeles
04-Jun-2010
Adonis Blue - imago - Nr Firsdown - 04-Jun-10 (3)
Photo © Pete Eeles
04-Jun-2010
Adonis Blue - imago - Nr Firsdown - 04-Jun-10 (5)
Photo © Pete Eeles
04-Jun-2010
Adonis Blue - Mill Hill - West Sussex - May 17th 2014
Photo © mud-puddling
Adonis-Blue-Martin Down 21 May 2011 03C0831
Photo © IainLeach
Adonis-Blue-Martin Down 21 May 2011 03C6925
Photo © IainLeach
Adonis-Blue-Martin Down 21 May 2011 03C9277
Photo © IainLeach
Adonis-Blue-Martin Down 21 May 2011 03C9584
Photo © IainLeach
Adonis-Blue-Martin Down 5 June 2010 I9T6387
Photo © IainLeach
Adonis-Blue-Martin Down 5 June 2010 I9T7145
Photo © IainLeach
Adonis-Blue-Martin Down 5 June 2010 I9T7471
Photo © IainLeach
Adonis-Blue-Martin Down 5 June 2010 I9T7934
Photo © IainLeach
Adonis Blue (f)  Denbies Hillside, Surrey  3rd September 2011
Photo © millerd
03-Sep-2011
Adonis Blue male - Durlston Country Park Dorset 03.09.2012
Photo © nfreem
03-Sep-2012
Adonis Blue female - Mill Hill, Sussex 19-May-2010
Photo © Neil Hulme
19-May-2010
Adonis Blue male - Mill Hill, Sussex 19-May-2010
Photo © Neil Hulme
19-May-2010
Adonis Blue - imago - Figsbury Ring - 19-Jun-13-8
Photo © Pete Eeles
19-Jun-2013
Adonis Blue - imago - Figsbury Ring - 19-Jun-13-9
Photo © Pete Eeles
19-Jun-2013
Adonis Blue male - Mill Hill, Sussex 29-Aug-2013
Photo © Neil Hulme
29-Aug-2013
Adonis-Blue- 5D32295 Larden Chase 23 August 2013
Photo © IainLeach
Adonis-Blue- 5D34448 Larden Chase 23 August 2013
Photo © IainLeach
Adonis Blue males - Malling Down, Sussex 30-Aug-2013
Photo © Neil Hulme
30-Aug-2013
Adonis Blue - Bonchurch Down IOW 27.05.2014
Photo © nfreem
27-May-2014
Adonis Blue - Bonchurch Down IOW 28.05.2014
Photo © nfreem
28-May-2014

  Aberrations  

Although far more consistent in colour and marking than its close relative the Chalk Hill Blue, the Adonis Blue is a considerably variable butterfly nonetheless.

In common with other members of the family, this species demonstrates much variation in the number, size and orientation of the underside spotting, ranging from the extremes of ab. Krodeli (absence of spotting to the underside) to heavily striated examples where the familiar spots are greatly extended into black streaks (ab. striata).

The blue of the male upperside can also vary; in some examples there is a distinctly green tint to the wings (ab. viridescens) while others are sometimes of a pale shade (ab. pallida). A grey-blue colouration is known as ab. suffusa and examples where the typical blue colour is replaced by a blue-black shade are known as ab. nigra.

The blue form of the female in which the blue scaling extends over the fore and hind wings obliterating the brown ground colour except along the costa and outer margins, and with orange lunules present on all wings is called ab. ceronus. Where the orange lunules are present on the hindwings only this is referred to as ab. semiceronus. The amount of blue on the female is subject to much variation and at first may appear random, with each 'blue female' appearing different from the next, however, once you start looking at these females closely you begin to see that the same traits do occur again and again, and all of a sudden the distribution of blue scales and development of the lunules is far from random but actually made up of a finite series of recognisable and repeating characteristics. It is these repeating characteristics that enables us to name these aberrations from descriptions made over a century ago. The blue aberrations of the female Adonis Blue are more frequently met with in the spring brood, suggesting an environmental trigger at the heart of these suffusions.

Very rarely this species is known to hybridise with its close relative the Chalkhill Blue, resulting in specimens that bare traits from each species and a colouration that appears (in the male) to be half way between each species in their typical forms. This butterfly is traditionally known as ab. polonus, although being a hybrid it is not an aberration as such at all. Strictly speaking it should probably be known as bellargus x coridon. It is well worth looking out for this hybrid at sites where both species fly together. Polonus is encountered within the spring brood of Adonis Blue.

Gynandromorphs occur in this species but are rare. Occasionally female specimens will be found with strong streaks of male colouration on one or more wings (sexual mosaics or mixed gynandromorphs) and very rarely halved gynandromorphs are encountered where the butterfly exhibits male colouration on one side, and female colouration on the other, even on the abdomen.

There are 109 named aberrations known to occur in Britain.

Click here to see a full list of aberrations for this species.

Unclassified Aberrations


Adonis Blue Female ab.caerulescens lunulata -  Ballard Down, Dorset 26-May-05
Photo © Vince Massimo
26-May-2005
Adonis Blue - aberration - Unknown location - Unknown date (2) [Graham Smith]
Photo © Graham Smith
Adonis Blue - aberration - Unknown location - Unknown date (3) [Graham Smith]
Photo © Graham Smith
Adonis Blue - aberration - Westbury Downs - 30-Aug-05 [Graham Smith]
Photo © Graham Smith
ab. conjunta
Adonis Blue Female (ab. caeruleo-cuneata) Ballard Down, Dorset 7-Sept-10
Photo © Vince Massimo
07-Sep-2010
Adonis Blue Female (ab. caeruleo-cuneata) Ballard Down, Dorset 5-Sept-10
Photo © Vince Massimo
05-Sep-2010
Adonis Blue Female (ab. caeruleo-cuneata) Ballard Down, Dorset 7-Sept-10
Photo © Vince Massimo
07-Sep-2010
Adonis Blue Female (ab. caeruleo-cuneata) Ballard Down, Dorset 7-Sept-10
Photo © Vince Massimo
07-Sep-2010
Adonis Blue Female (ab. venilia) Ballard Down, Dorset 5-Sept-10
Photo © Vince Massimo
05-Sep-2010
Adonis Blue Female (ab. caerulescens-lunulata) Ballard Down, Dorset 7-Sept-10
Photo © Vince Massimo
07-Sep-2010
Adonis Blue Female (ab. caerulescens-lunulata) Ballard Down, Dorset 5-Sept-10
Photo © Vince Massimo
05-Sep-2010
Adonis Blue Female (mixed gynandromorph "intersex") Ballard Down, Dorset 9-Sept-10
Photo © Vince Massimo
09-Sep-2010
Adonis Blue - imago - Martin Down - 24-May-10 (1)
Photo © Pete Eeles
24-May-2010
Adonis Blue - imago - Nr Firsdown - 02-Jun-10 (8)
Photo © Pete Eeles
02-Jun-2010
Adonis Blue - imago - Nr Firsdown - 04-Jun-10 (4)
Photo © Pete Eeles
04-Jun-2010
'ab.' polonus (bellargus x coridon) Mill Hill Sussex. May 2010
Photo © Neil Hulme
19-May-2010
8696 Adonis Blue Male Variant (right side markings differ from left side) - Denbies Hillside, Surrey 13-May-11
Photo © Vince Massimo
13-May-2011
8697 Adonis Blue Male Variant (left side markings differ from right side) - Denbies Hillside, Surrey 13-May-11
Photo © Vince Massimo
13-May-2011
Adonis Blue Female (Variant) Ballard Down, Dorset 19-May-08
Photo © Vince Massimo
19-May-2008
Adonis Blue - aberration - Denbies Hillside - 13-May-11 (1)
Photo © Pete Eeles
Adonis Blue - aberration - Denbies Hillside - 13-May-11 (2)
Photo © Pete Eeles
Adonis Blue - aberration - Denbies Hillside - 13-May-11 (4)
Photo © Pete Eeles
Adonis Blue - aberration - Denbies Hillside - 13-May-11 (6)
Photo © Pete Eeles
Adonis Blue - aberration - Denbies Hillside - 13-May-11 (7)
Photo © Pete Eeles
Adonis Blue - aberration - Denbies Hillside - 13-May-11 (10)
Photo © Pete Eeles
Adonis Blue Female (ab.) - Denbies Hillside, Surrey 13-May-11
Photo © Vince Massimo
13-May-2011
Adonis Blue (very blue female)  Denbies Hillside, Surrey  22nd September 2010
Photo © millerd
22-Sep-2010
Adonis Blue Female ab. semiceronus -  Ballard Down, Dorset 20-May-08
Photo © Vince Massimo
20-May-2008
Adonis Blue - imago - Figsbury Ring - 19-Jun-13
Photo © Pete Eeles
19-Jun-2013
Adonis Blue - imago - Figsbury Ring - 19-Jun-13-6
Photo © Pete Eeles
19-Jun-2013
Adonis Blue (mixed gynandromorph) - Denbies Hillside, Surrey 25-May-2014
Photo © MrSp0ck
Adonis Blue female - Wiltshire - 30th - May - 2014
Photo © Maximus
30-May-2014
Adonis Blue male ab. Swell's Hill 17.08.2014.
Photo © Nigel Kiteley
17-Aug-2014

ab. caerulescens (Tutt)

Occurs in the female. Upperside forewings blue from the base to beyond the discoidal spot. On the hindwings the blue extends from the centre to the orange marginal lunules. Orange lunules on the hindwings only.


Adonis Blue Female (ab. caerulescens) Ballard Down, Dorset 7-Sept-10
Photo © Vince Massimo
07-Sep-2010

ab. cuneo-lunulata (Tutt)

Occurs in the female. Blue scaling at base of fore and hindwings. Orange lunules externally edged with blue. Blue wedges present on the internal edges of the lunules which are well developed on the hindwings.


Adonis Blue Female (ab. cuneo-lunulata) Ballard Down, Dorset 9-Sept-10
Photo © Vince Massimo
09-Sep-2010
Adonis Blue Female (ab. cuneo-lunulata) Ballard Down, Dorset 7-Sept-10
Photo © Vince Massimo
07-Sep-2010

  Ovum  

Eggs are laid singly, typically on the underside of terminal leaves of the foodplant. A preference is shown for small sprigs of foodplant growing in short turf. Eggs laid in May or June hatch in a week or two, whereas those laid in August and September can take several weeks longer.


Adonis Blue - ovum - Godlingstone Hill - 90 [Tim Norriss]
Photo © Tim Norriss
Adonis Blue - ovum - Figsbury Ring - 19-Jun-13
Photo © Pete Eeles
19-Jun-2013
Adonis Blue ovum - Found - Ballard Down, Swanage 16.06.14
Photo © Tony Moore

  Larva  

The larvae are green with yellow stripes running along the length of the body. Unlike its close relative, the Chalkhill Blue, the larva of the Adonis Blue feeds by day. The larva has a Newcomer's gland in the 7th segment which provides secretions that are attractive to ants. This is a symbiotic relationship for, like many other blues, the Adonis Blue larva (and pupa) is afforded protection by the ants from parasites and other predators.

Early instars feed by grazing on one side of the leaf, leaving the epidermis of the other side intact. When not feeding, the larva rests at the base of the foodplant, often on bare soil. Ants are known to bury the larva in a cell in the earth, where the ants continue to "milk" it for secretions. If not overwintering, this stage lasts around a month.


Adonis Blue Larva - Durlston CP - 26-7-08
Photo © Gwenhwyfar
26-Jul-2008
Adonis Blue - larva - Thatcham - 04-Sep-07 (1185)
Photo © Pete Eeles
04-Sep-2007
Adonis Blue - larva - Thatcham - 08-Sep-07 (1194) {REARED}
Photo © Pete Eeles
08-Sep-2007
Adonis Blue - larva - Thatcham - 08-Sep-07 (1195) {REARED}
Photo © Pete Eeles
08-Sep-2007
Adonis Blue larva -  Mill Hill, Sussex  14-April-2011
Photo © Neil Hulme
15-Apr-2011
Adonis Blue larva - Mill Hill, Sussex  14-April-2011
Photo © Neil Hulme
15-Apr-2011
Adonis Blue larva - Mill Hill, Sussex  14-April-2011
Photo © Neil Hulme
15-Apr-2011

  Pupa  

The pupa is formed on the ground, often in a small hollow or crevice. Ants are known to bury the pupa in a chamber in the earth that is connected to the ants' nest, where it is constantly attended by ants. This stage lasts around 3 weeks.


Adonis Blue - pupa - Thatcham - 06-Oct-04 [REARED]
Photo © Pete Eeles
06-Oct-2004

  Similar Species  

Brown Argus

Description to be completed.

Chalkhill Blue

The female Adonis Blue is easily mistaken for a female Chalkhill Blue and the two species occasionally fly together toward the second half of August on some sites. Distinguishing the two is not at all easy. One guideline is that the pale scales on the hindwings, between the red dots and the white fringe, are blue in a female Adonis Blue, and white in a female Chalkhill Blue.


Adonis Blue female (left) and Chalkhill Blue female (right)

Common Blue

The male Adonis Blue is often mistaken for a male Common Blue. However, the two can be distinguished by looking at the white fringes of the wings. Only on the Adonis Blue are the fringes intersected by black bands. This diagnostic can also be used to distinguish the two species based on their undersides.


Adonis Blue male (left) and Common Blue male (right)

Northern Brown Argus

Description to be completed.

  Videos  

Video © willowspuppy1
Adonis Blue Butterfly Relocation
Video © DAVID ELEMENT
Adonis Blue Butterfly Lysandra bellargus Larva with Red Ants Myrmica sabuleti
Video © Roger Wilmshurst
Adonis Blue male
Video © Roger Wilmshurst
Adonis Blue female

  Sites  

Click here to see the distribution of this species overlaid with specific site information. Alternatively, select one of the sites listed below.

Sites
Ballard Down, Beachy Head, Bindon Hill, Bonchurch Down, Box Hill, Broughton Down, Butchershole Bottom, Butts Brow, Calstone Coombes, Castle Hill NNR, Cerne Hill Giant, Cheriton Hill, Clubmen's Down, Colekitchen Down, Compton Down, Coombe Bisset Down, Corfe Castle, Cotley Hill, Darlands Banks LNR, Denbies Hillside, Devils Dyke, Durlston Country Park, Durlston NNR, Fontmell Down, Frog Firle Farm, Hambledon Hill, Hartslock, Hod Hill, Hog Cliff Bottom, Jerry's Hole, Lankham Bottom, Larden Chase, Long Knoll, Lydden Down, Malling Down, Martin Down, Middleton Down, Mill Hill, Mount Caburn, Old Winchester Hill, Osmington, Portland Tout Quarry, Seven Sisters Country Park, Sovell Down, Stonehill Down, Stubhampton Bottom, Townsend Quarry, West Yatton Down, White Sheet Hill, Windover Hill, Wolstonbury Hill, Yoesden Bank

  Conservation Status  

This butterfly is dependent on unimproved calcareous grassland and has suffered from both loss of habitat as well as inappropriate habitat management. It is therefore considered a species of conservation concern.

UK BAP StatusDistribution Trend (%)Population Trend (%)
Species of Conservation Concern
Increase+30
Increase+33

The table above shows the distribution and population trends of species regularly found in the British Isles. The distribution trend represents a comparison between data for the periods 1995-1999 and 2005-2009. The information provided is taken from the Butterfly Conservation report The State of the UK's Butterflies 2011. The UK BAP status is taken from the UK Biodiversity Action Plan (UK BAP) (2007 review).


  Links  

The following links provide additional information on this butterfly.

  References  

The species description provided here references the following publications:

ReferenceDetails
Rottemburg (1775) von Rottemburg, S.A. (1775) Der Naturforscher.
Verity (1919) Verity, R. (1919) Seasonal Polymorphism and Races of some European Grypocera. Entomologist's Record and Journal of Variation.
Verity (1934) Verity, R. (1934) The Lowland Races of Butterflies of the Upper Rhone Valley. Entomologist's Record and Journal of Variation.

  Copyright © Peter Eeles 2002-2014
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