Most physical descriptions on Troutnut are direct or slightly edited quotes from the original scientific sources describing or updating the species, although there may be errors in copying them to this website. Such descriptions aren't always definitive, because species often turn out to be more variable than the original describers observed. In some cases, only a single specimen was described! However, they are useful starting points.
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.