There
are about 130 described species, of which most occur in temperate or
warm regions (Scoble
1992: 279).
Identification: Buszko 1977, Ford 1953, Gozmány 1955a,
Scholz
& Jäckh 1994, Zagulyaev 1986.
Nomenclature according to Fauna
Europaea.
Species in Belgium: 2.
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