Species diversity survey of flowerflies (Diptera: Syrphidae) in Firuzkuh County

The Syrphidae family is one of the largest families of Diptera which known as hoverfly and flowerfly in the world. This family is consists of 3 sub families and 15 tribes and about 6000 species. Flowerflies in imago stage feed entirely on nectar and pollen while some species in larval stage feed on aphids. They play an important role in biological control. In present study, species diversity investigation was carried out in Firuzkuh County, during 2009-2010. Then ecological indices including: Measures of heterogeneity Simpson and Shannon-winer, measures of evenness Simpson, Camargo and Smith-Wilson, species richness, Variance and standard deviation were estimated. Adult specimens were collected with sweeping net and specimens were transferred to laboratory in Shahid Beheshti University, and by using identification keys such as: Stubs & Falk,1996; Bi-Bienko, 1988 and Speigh & Sarthou, 2008 were identified. For confirmation we sent the species to Dr. Barkalov from Russia and were confirmed. In totally, we collected 25 species from 2 sub families of Syrphinae and Eristalinae