| | | Kind of type | Full locality |
| | | holotype of synonym Perla titusi Banks, 1918 | Northwestern U.S.A., Idaho: Blackfoot; 22 June |
| | | holotype of species Isogenoides colubrinus (Hagen, 1874) | Northwestern U.S.A., Idaho: Snake River |
| | | unspecified primary type of synonym Perla incesta Banks, 1920 | Northwestern U.S.A., Oregon, Benton County: Philomath, Ore., Rock cr. ,Mar. 19, 1933, (R. Dimick) |