Proboscis: long, black
Palpi: about as long as the proboscis, dark scaled.
Head: Occiput clothed with erect forked scales, those on central part white, others dark; scales of vertex narrow, white, frontal tuft white.
Thorax: Integument of scutum with a broad median frosted stripe, dark brown laterally; the frosted area clothed with short pale-yellow hairs. Scutellum crescent-shaped, clothed with yellow hairs and long brown setae.
Abdomen: Integument dark brown to black, clothed with pale and dark hairs.
Legs: Dark-scaled, femora and tibiae tipped with pale scales.
Wings: length about 4.0 mm. Scales black and pale yellow, in contrasting lines and spots. (costa with a pale spot at outer third opposite tip of subcosta; vein 6 with basal fourth and apical half dark-scaled; vein 3 and 5 entirely dark-scaled.)
Halter: knob, dark-scaled.
Bionomics: Larvae are found in ponds, temporary pools, springs, borrow pits, roadside puddles, wheel ruts, hog wallows, eddies of streams, rain-water barrels and other artificial containers…species seems to prefer cool and clear water. Females usually attack after dusk but will attack during daytime in wooded area or in their resting places. They rest during day in hollow trees, culverts, underneath overhanging banks of streams or similar dark moist shelters. They reach their greatest abundance in early Spring and late Fall…being less abundant in midsummer. They overwinter as adult female in buildings, cellars, hollow trees and other protected shelters. They can be infected with malaria in the laboratory. Flight range is short …up to only 1/4 mile.