Enallagma cyathigerum (female)
English name:	Common Blue Damselfly
Dutch name:	Watersnuffel
Photo taken at the Leenderheide,(NL), August 1998

Note: This is a weird picture: it's a female Enallagma cyathigerum, with the remnants (only the abdomen!) of a male on her prothorax! Whether she ate him or he was caught by a predator, I don't know, but It makes a fun picture!