The second species of the subgenus Leptus (Amaroptus) (Trombidiformes: Erythraeidae) from Türkiye.

A new species of the subgenus Leptus (Amaroptus), L. (A.) sivasensissp. n., is described and illustrated from an ectoparasitic larva collected from Cerceris sabulosa (Panzer, 1799) (Hymenoptera: Crabronidae) in İmranlı district of Sivas province, Türkiye. The holotype and paratypes of Leptus (Amaroptus) vuki are studied and some corrections to the original description are presented. Also, new metric data and host records are given for L. (L.) tridentatus and L. (L.) rosellae, and intraspecific differences of both species are discussed. [ABSTRACT FROM AUTHOR]