SeasonalityAdults can be found on the wing from late May all the way in September in some places, with peak activity during June and early July (Teskey 1990).
IdentificationAdult females are 8-11 mm long, mainly black, with patches of white pruinosity (powder) and hairs (Teskey 1990). On the head, the antennae are slender, with the first three segments yellow, the remainder black; the frons is nearly square; the clypeus is glossy black, with a shorter median pruinose stripe compared to other Chrysops; the palpi are black. The thorax is covered with mainly white hairs, with sparse black hairs and two indistinct parallel stripes on the scutum; the notopleuron has dominant black hairs; the legs are black, with paler mid and hind tarsi; the wings are infuscated moderately. The abdomen is black dorsally and ventrally, with faint median pruinose triangles on tergites 1-2 (Teskey 1990).
Males are similar but even more pigmented, and they have black hairs all over except for apical abdominal segments (Teskey 1990).
Chrysops mitis can be difficult to distinguish from C. ater, but the wing cell cua1 is infuscated at its base in the former and is hyaline (transparent) in the latter (Teskey 1990).
Larvae are cylindrical, elongate, fusiform (spindle-shaped), creamy white to pale yellow, frequently with a greenish tinge, and 16-18 mm long. They are virtually indistinguishable from the larvae of Chrysops cincticornis (Teskey 1969).