| | | Kind of type | Full locality |
| | | [not recorded as a type] | Southwestern U.S.A., Utah: Copenhagen |
| | | [not recorded as a type] | Southwestern U.S.A., Utah, Cache County |
| | | [not recorded as a type] | Southwestern U.S.A., Utah, Summit County |
| | | holotype of synonym Steiroxys hendersoni Caudell, 1923 | Southwestern U.S.A., Utah: Dry Lake |
| | | unspecified primary type of species Steiroxys pallidipalpus (Thomas, 1872) | Southwestern U.S.A., Utah: Copenhagen |