The presence of a single pair of patent , mesothoracic flight wings distinguishes most true flies from other insects with `` fly '' in their names , such as mayflies , dragonflies , damselflies , stoneflies , whiteflies , fireflies , alderflies , dobsonflies , snakeflies , sawflies , caddisflies , butterflies or scorpionflies .
The presence of a single pair of wings distinguishes true flies from other insects with `` fly '' in their name , such as mayflies , dragonflies , damselflies , stoneflies , whiteflies , fireflies , sawflies , caddisflies , butterflies or scorpionflies .