Mayfly Species Procloeon rubropictum (Tiny Sulphur Duns)

Abdominal tergites 2-6 of male imago yellowish white; small red submedian dots and traces of ruddy median line.

Turbinate eyes long and narrow, oval; in dried specimen, shriveling to form lunate discs, leaving central portion of head free. Head blackish brown. Thorax deep brown; margins of mesonota and metanota and sutures slightly ruddy. Legs wholly pale yellowish white. Wings hyaline. Abdominal segments 2-6 pale yellowish white; a reddish inverted Y-shaped mark on tergite 2; tergites 3-6 with slight traces of a reddish median line, and small red submedian dots on the posterior margins; above the spiracular line and near the central area of each tergite is a faint red dot. Tergites 7-10 bright red-brown; sternites opaque whitish. A broken black line marks the spiracular area. Tails and forceps whitish. Plate between the bases of the forceps limbs a rectangular projection (see fig. 168).

The ruddy dots and broken black line of the abdominal tergites separate this species from C. insignificans (now a synonym of Procloeon insignificans); the darker thorax and ruddy markings distinguish it from C. simplex (now a synonym of Procloeon simplex).