Key to Male Imagoes
1. Penes dorsally without a basal dome-like swelling, at most only with lateral ridges; venation of forewings whitish to brown; stigmatic region of forewings usually with no or few anastomosed crossveins; abdominal terga usually dark reddish-brown, occasionally orange. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Isonychia bicolor
Penes dorsally with a basal dome-like swelling forming lateral and apical ridges; neation of forewings whitish to yellowish; numerous stigmatic crossveins of forewings usually anastomosed; abdominal terga usually bright red to reddish-orange brown. . . Isonychia rufa
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Key to the Isonychia Adult Species