the morphological study of merodon latifemoris species (diptera: syrphidae) in jolfa region, north west of iran

different species of syrphid flies are beneficial insects in nature and are important in agriculture. during a faunistic study on syrphid flies (dip.:syrphidae) on 2011 to 2012 of djolfa region (east azarbaijan province), one merodon (meigen, 1803) species was collected. they were identified as merodon latifemoris radenkovic, based on morphological characters as a new species from iran region. in this study, species were collected and transferred to the laboratory of entomology, in islamic azad university of marand and studied at the morphological character. the syrphidae important organs such as legs, wings, thorax, abdomen and genitalia were examined. in this research isolated end of the tergit, and transferred in to koh 10% for 24-12h and then transferred in to alcohol 10%, so added one drope glycerin at study time, and was recognized by prestigious keys. their figures and a simple diagnostic key were provided for their determination in this region.