It sounds reasonable what Tony Urwin writes, "thrix" is feminine according to Greek dictionaries and "Eriothrix" should then also be feminine according to Art. 30.1.2. ICZN. Also Sabrosky, who was very correct in nomenclatural things, used the spelling "Eriothrix rufomaculata" in his Catalog of family group names of Diptera". So I fear I must change that too.

Meigen 1803 did not state the gender of his genus, and he subsequently unfortunately did not use his own genus name (he placed the species of Eriothrix in the vast genus Tachina).

Villeneuve (who presumably knew the Greek language) was obviously the first who described a new species under the name Eriothrix (Eriothrix experrectus Villeneuve, 1916), i.e. he used the gender as masculine, but I believe this has no nomenclatural consequence concerning the gender of the genus name. Masculine was also used by Kolomiets 1967 and by Mesnil in Lindner. Stein 1924 and Herting (from 1969 on) understood the name as feminine, but also Herting wrote "rufomaculatus" in his papers before 1969.

Herting gave his catalogue version of 1984 to Dely-Draskovits as manuscript for the Hungarian catalogue. She deliberately changed the gender of Eriothrix back to masculine in the 1993 catalogue, and because I supposed that she had good reasons for that change I followed her with the names for the Central European key. I understood that Dely-Draskovits followed the Code, because she corrected also Benno's emendations in accordance to the ICZN. But, indeed, I did not ask her what her reasons were.