Flight-period Central Europe: from Mid May to Mid September

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Imago

Conservation Status in Austria: Near Threatened (NT)

  NE DD LC NT VU EN CR RE EX
Austria
Vienna - Austria

English:
German:
Danish:
Date:01/06/2017
Location:Austria, Niederösterreich, Oberweiden
 
Copyright:Per Hoffmann Olsen
Camera:Canon EOS 50D
Lens:Sigma 150mm APO Macro
 

To determine the P. argus from the two other Plebejus species in Lower Austria you need to look at the fore-tibia of the Male species. If it has a spine it's P. argus.

If it hasn't a spine, it could be either P. idas or the P. argyrognomon, which only can be determined using genitalia preparation of the Male.

This is a female, so it could be any of the 3 species. 

Females of the P. idas and P. argyrognomon often has a clear sprinkel of blue on the upperside wings.