Mayfly Species Paraleptophlebia debilis (Mahogany Dun)

This is a handsome, clear-winged, rich brownish, late-season species. Head above, thorax, and both ends of abdomen deep rich brown. Legs pale. Wings hyaline with pale veins. Costal cross veins obsolete except in the stigmatic area where they are numerous, simple, curved, and strongly aslant, and where the proximal end (next to subcosta) of each is obsolescent.

Abdomen white on segments 2 to 7, with brownish purple half-rings across the apices of the segments. A brown point on the spiracle, and a rounded brown spot before each spiracle above the lateral margin. Ganglia marked with yellow. Forceps with a large, ventral, basal lobe-like dilation. Penes separated by a U-shaped notch; each dilated at its outer end, narrowing the notch. On the outer side at the end there is a recurved lateral tooth. The reflexed spur is twice as long as the cleft is deep; it is arcuate, outcurving and acute at the apex (see fig. 134). Tails white.

This is a common species in the northeastern states.