mainly occur in the tropics, but the family is represented in all the
zoogeographical regions. About 1000 species have been described (Scoble 1992: 268).
Identification: Dabrowski 1965,
Freina & Witt 1990, Forster &
Wohlfahrt 1960, Koch
Nomenclature according to Fauna
Species in Belgium: 2.