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Polyommatus eroides

False Eros Blue

Field Notes

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Pirin Mts, Bulgaria, July 2004

 

Pirin Mts, Bulgaria, July 2004

 

Pirin Mts, Bulgaria, July 2004

 

Pirin Mts, Bulgaria, July 2004

 

Pirin Mts, Bulgaria, July 2004

 


This appears to be a very local butterfly found at higher elevations. It flies in from June to mid-July. It is known principally from the Balkans but is also found further north in isolated regions in Hungary, Slovakia and Poland.

It is a bright blue with distinctive dusky borders on the upperside. In fact it is quite unmistakable despite its superficial resemblance in the field guides to species such as the Common Blue (P. icarus). Contrary to the butterflies illustrated in Tolman (1997) it has a black cell spot on the underside forewing.

After a failed search in mid/late July 2000 we eventually found it flying over rocky ground in the Pirin Mts. of southern Bulgaria in the 1st half of July 2004. There were sparse grasses and plenty of flowers for the adults to feed upon. Subsequently we found it in similar habitats and close to where we searched for it in NW Greece in 2000. Evidentially flight time is subject to seasonal variation. All of our sites were above 1600m and very localised. There was a single site that varied from the other habitats which was dominated by lush grass and lacked bear rocks.

 

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