Syrphid flies are members of the insect order diptera, or true flies.
True flies have one pair of wings, while other flying insects have two pairs.
In Canada, there are over 7,000 different types of flies in the diptera order. For easy identification, they are divided into 113 different families. One family is the Syrphidae or flower fly. It's possible this extra vein strengthens their wings, making them masters in hovering. When you get too close, they quickly dart off.