North America. Asia seems to represent the greatest number of
these species with 150 species found in China, 174 species in
the ex USSR, about 50 species reported to occur in Japan,
35 species are found in Iran and 37 species are found in India
mostly confined to the North Western Himalayas (Hu, 1965;
Poljakov, 1961; Kitamura, 1939; Rechinger, 1986).