The species is widespread throughout Europe, except for the Scandinavian
Larvae of Silo nigricornis live on stony substratum in
rivulets, streams and rivers (Wallace et al. 2003, Botosaneanu &
Malicky 1978). They can be found in the Alps, in mountainous regions
and in lowlands (Pitsch 1993). Larvae prefer habitats with a current
velocity of 40-70 cm/s, but they can also be found in places with
current velocities up to 110 cm/s (Nielsen 1942).
Larvae are scrapers and feed on epilithic algae and detritus (Graf
et al. 2002, Wallace et al. 2003).
Adults are present from April to August (Waringer & Graf 1997).