New taxonomic data are provided on the ladybird spider genus Eresus
Walckenaer, 1805 in Turkey and Iran. Eresus adaleari Zamani & Szűts,
sp. n. is described as a new species, on the basis of a single male
specimen collected in Semnan Province, northeastern Iran, and Eresus
lavrosiae Mcheidze, 1997, previously known solely from the original
description of the male holotype from Georgia, is re-described on the
basis of one newly collected male specimen from Kars Province, eastern
Turkey. Both of these species are generally dark-colored, which
contrasts with the usual coloration of males of this genus. Finally, a
few methods and suggestions that might accelerate and improve taxonomic
procedures for studying this group are discussed.