Mayfly Species Procloeon insignificans (Tiny Sulphur Duns)

Abdominal tergites 2-6 of male imago pale hyaline; short obsolescent ruddy geminate dorsal streaks on 2 and 3.

Eyes blackish brown. Head and thorax deep brown, almost unicolorous; sternum slightly paler. Legs whitish. Wings hyaline, venation pale. 5 to 6 cross veins in the stigmatic area; intercalaries absent from 1st and 2nd interspaces; 1st cross vein between radius and radial sector in a line with the second one. Abdominal segments 2-6 hyaline, wholly pale except for short ruddy mid-dorsal obsolescent streaks on tergites 2 and 3. Tergites 7-10 deep fawn brown, the sternites somewhat paler. Tails and forceps whitish. Plate between bases of forceps dome-shaped, its posterior margin convex.

This species may be separated from the allied C. rubropictum (now a synonym of Procloeon rubropictum) by the absence of red dots and black stigmatic markings, and the fawn-colored apical sternites.