Records ol Atherix ibis in Finland (Diptera, Athericidae)

Eight clusters of mummified females of Atherix ibis (Fabricius) were found on 6.IX.1988 under a bridge over the Kouvanjoki River, PP: Pudasjärvi, northern Finland. Inspection of 120 bridges during the winter yielded 17 new finds. A distribution map complemented with records from museums indicates that the distribution in Finland is northern. Features of the clusters and characters of the larval stage are described and discussed. The larval development seems to last two years.