Caenis lactea. – F.-J. Pictet, 1843 -1845: 276-277, pl. 43, figs 1-4, pl. 44 (nec Oxycypha lactea Burmeister, 1839; misidentification).
Caenis horaria (Linnaeus, 1758). – Jacob, 1974: 94.
Material: NMW; 2 ♂ imagines, 1 ♂ subimago; coll. Nat. Mus. Wien [without locality data].
Remarks: F.-J. Pictet did not mention that he received material from Kollar, but in the NMW three specimens presumably had originally been deposited under the name Caenis lactea Pictet and identified by Malzacher as: Caenis horaria (Linnaeus, 1758) / Malzacher det. 1983.