Mayfly Species Ameletus subnotatus (Brown Duns)

A large speckled-winged species, in which the ventral abdominal markings consist of dark dashes from the base of each segment, and two dark dots.

Head and thorax blackish brown. Fore leg dark reddish black; a black apical band on the femur. Middle and hind legs somewhat lighter brown; the femora banded apically with dark brown, the tarsi darker than the tibiae, especially toward the tips. Wings hyaline; both wings clouded with dark brown close to the wing roots. Venation blackish brown, many cross veins margined with brown. Small brown spots below the bulla on the radius, at the inner ends of the intercalaries of the radial sector, at the division of its outer fork, and at the inner end of the intercalary of that vein. Stigmatic cross veins branched and anastomosed, forming a rather dense network.

Abdomen pale yellowish brown dorsally; the posterior margins, the median stripe and the postero-lateral angles dark brown. Ventrally paler than the dorsum; sternites 2-6 marked with dark submedian dashes and a dark dot near the center on each side of the median line. Sternite 9 yellowish brown, a dark triangle on each side in place of the submedian streaks; lateral margins blackish brown. Forceps base shaded with dark brown. Forceps lighter brown. Tails blackish brown at the base.