1Department of Entomology, Faculty of Agriculture, Tarbiat Modares University, P. O. Box: 14115-336. Tehran, I. R. Iran.
2Dr. Dreeslaan 204, 4241 CM Arkel, Netherlands, E-Mail: email@example.com.
The fauna of the subfamily Diplazontinae (Hymenoptera: Ichneumonidae) in the north central parts of Iran was studied during 2010-2011. A total of 933 specimens were collected in 30 localities at different altitudes using Malaise traps. Sixteen species belonging to 7 genera were identified of which twelve species indicated by asterisk, are new records for Iran: Diplazon annulatus (Gravenhorst)*, Diplazon laetatorius (Fabricius),D. pectoratorius (Gravenhorst)*, D. tibiatorius (Thunberg)*, Enizemumornatum (Gravenhorst), Homotropus nigritarsus (Gravenhorst)*, Homotropus pictus (Gravenhorst)*, Promethessulcator (Gravenhorst), Sussabaflavipes (Lucas)*, Sussabapulchella (Holmgren)*, Syrphoctonustarsatorius (Panzer)*, Syrphophilusbizonarius (Gravenhorst)*, Tymmophorusobscuripes (Holmgren)*, Woldstedtiusbiguttatus (Gravenhorst), Woldstedtiuscitropectoralis (Schmiedeknecht)* and Xestopeltagracilima (Schmiedeknekht)*. Detailed morphological characters and a key to the genera and species are provided. Flight periods and distribution in relation to altitude on two slopes of the Alborz mountains are discussed.