Generally an obvious bulky skimmer,totally blue in males, in southern Europe they are easily (in my case) confused with Keeld Skimmer f anceps, but the blue face seems diagnostic
Female BulgairiaFemale BulgariaFemale BulgariaFemale BulgariaImmature female LesvosMale BulgaiaMale BulgariaMale BulgariaMale BulgariaMale BulgariaMale BulgariaMale BulgariaOld female BulgariaOld female BulgariaOld female BulgariaSouthern Skimmer , AndaluciaSouthern Skimmer , Andalucia-2Southern Skimmer , Andalucia-3Southern Skimmer male AndaluciaSouthern Skimmer male Andalucia-2