Hover flies have club shaped tarsal segments, with some species these segments each have a dark pigment spot at the top.
With a few exceptions, hoverflies are distinguished from other flies by a spurious vein (false vein), located parallel to the fourth longitudinal wing vein.
The antennaa has three segments (though often the segment nearest to the head is missing) and an arista.
The maxillary palp is long and slender. The compound eyes are large.
The halter (or balance organ) has a long slender shaft, with an extended spoon-like tip.