Study on predatory mites of Aceria tristriatus (Nalepa, 1890) from Hamedan and Lorestan provinces, Western Iran Author Ahmad-Hosseini, Mohammad . Department of Plant Protection, College of Agriculture, Bu-Ali Sina University, Hamedan, Iran; E-mails: mahmad hoseini @ yahoo. com; mkhanjani @ gmail. com Author Khanjani, Mohammad . Department of Plant Protection, College of Agriculture, Bu-Ali Sina University, Hamedan, Iran; E-mails: mahmad hoseini @ yahoo. com; mkhanjani @ gmail. com Author Karamian, Roya . Department of Biology, Faculty of Science, Bu-Ali Sina University, Hamedan, Iran; E-mail: R _ karamian @ basu. ac. ir basu.ac.ir text Persian Journal of Acarology 2019 2019-04-15 8 2 125 145 journal article 10.22073/pja.v8i2.45640 2251-8169 4644893 4C425003-76FC-45EE-918E-FA17FEA2FC10 Genus Tydeus Koch, 1835 sensu Kaźmierski (1989) Diagnosis Prodorsum recurved; opisthosoma with 10 pairs of setae ( ps3 included); genital organotaxy in adults: no eugenital setae in female, but male with 4 pairs of eugenital setae; 4 or 6 pairs of genital setae present and 4 pairs of aggenital setae in both adults; coxa I with coxal organ; chaetotaxy of legs I-IV respectively (from tarsus to trochanter): 8+( ω )-3+ Ƙ -3-3-1, 6+( ω )-2 -2-2-0, 5-2 -1-1-1, 5- 2 -1-1-0, epimeral formula adults: 3-1-4-2; femur IV entire; palp chaetotaxy: 6+( ω )-2-2 ( André 2005 ).