How to identify it?
Male
The tail of the male common scorpion fly has conspicuous red genitalia.
Female
The common scorpion fly has a medium-sized, slender, long body. The prothorax is short, and the abdomen has alternating yellow and black. The female has a pair of short cerci at the end of the abdomen. Its long, narrow wings are membranous, with pagina sporting irregular black spots.
Ventral
Photo By Peter O'Connor aka anemoneprojectors , used under CC-BY-SA-2.0 /Cropped and compressed from original 
Scientific Classification
Phylum
Arthropods Class
Bugs Order
Scorpionflies Family
Scorpionflies Genus
Panorpa Species
Common scorpion fly 
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