Mayfly Species Anepeorus rusticus

A brownish species, thus distinct from the pale A. simplex (now a synonym of Spinadis simplex).

Head brown; eye margins opposite antennae tinged with ochreous. Thorax dull brown; pale ochreous tinges on pleura, especially anterior to wing roots. Fore legs brown, the tarsus rather blackish; middle and hind legs pale ochreous. Wings hyaline. Longitudinal veins pale, cross veins darker; the latter are very fine except in apical portion of fore wing, where they are thickened and “slightly anastomosed along costa” (McD.). Abdominal tergites dull clay-brown; basal segments somewhat semi-hyaline; tergites 8-10 light ochreous brown. Faint traces of submedian and lateral rows of small dark brown spots are present. Sternites somewhat paler than tergites; each sternite with "two small central dots and narrow lateral oblique dashes.” Forceps brownish ochreous; lateral apical portions of penes with fewer lobes than in A. simplex. Tails dirty whitish. Genitalia shown in fig. 112.