| 1a. Abdomen with dorsal abdominal stripe; subgenital plate with median indentation; forewing length greater than 12 mm |  |
| 1b. Abdomen concolorous; subgenital plate an even triangle; forewing length less than 10mm. |  |
| 1a. Abdomen with dorsal abdominal stripe; subgenital plate with median indentation; forewing length greater than 12 mm | |
| 1b. Abdomen concolorous; subgenital plate an even triangle; forewing length less than 10mm. | |
ReferencesLyon,ML; Stark,BP 1997 Alloperla (Plecoptera: Chloroperlidae) of western North America. Entomological News 108 5, 321-334.LinksKey to Male AlloperlaKey to Female Alloperla |