Abstract
A new species of the genus Stigmaeus, S. ueckermanni sp. nov., is described and illustrated, and S. longipilis (Canestrini) is recorded for the first time from Iran and re-described. Both species were collected from soil under hazelnut trees, Cory-lusavellana L. (Betulaceae) in Ardabil province, Iran. A key to the Iranian species of Stigmaeus is provided.