About Dioctria hyalipennis (Fabricius, 1794)
Dioctria hyalipennis (Fabricius, 1794) adults measure 10 to 14 mm in length. The upper head and vertex are shiny black, while the lower face is covered with silvery-white pile. Its mystax is white, and its short proboscis is black. The antennae look Y-shaped, with segments of roughly equal length. The antennae are black and covered with short black hair. This species has an obvious neck, and a raised, humped thorax. The thorax is black, marked with two long indented lines, and has a faint covering of light yellow pile. The scutellum (thorax segment 2) is small, with a line of yellow pile along its base. The sides of the thorax have a wide stripe of whitish pollen that extends along the thorax down to the front leg. The wings are hyaline, but appear darker when folded over the body. Wing veins are brown, and halteres are light yellow. The front and middle legs are mostly yellow, with black streaks along the top side and dark tips. The feet are black with grey pile, yellow spines, and yellow toes. The hind legs are black, with a swollen first foot segment. The abdomen is shining black, with a thin whitish line along the lower margin of each segment. In males, the first four abdominal segments are very narrow and constricted, giving a wavy appearance; the final few segments gradually widen toward the tip. In females, the abdomen is flat on the top side, rounded and orange on the underside; it is much wider and thicker than the male abdomen, but shorter in length.
