What is this insect? Looks like a dragonfly with only one pair of wings?

Question

I'm trying to ID an insect. Looks like this.

What is this?

http://pest.ca.uky.edu/EXT/master_gardener/entbasics/introduction/bregions.jpg

Answer 1

True flies are a large group of insects with only one pair of wings, although they have small balancing organs known as halteres where a second pair of wings might develop. The halteres vibrate with the wings and sense changes of direction.