A new species, Passiena bayi, is described from Laos based on both sexes. The new species is related
to P. spinicrus Thorell, 1890 and P. torbjoerni Lehtinen, 2005 occurring in Malaysia and Thailand, respectively.
The first detailed, illustrated description of the male palp and endogyne of the Passiena species is provided. Four
other species of wolf spiders, Hippasa holmerae Thorell, 1895, Ovia macritchie Lu, Koh, Zhang et Li, 2018,
Pardosa pseudoannulata (Bösenberg & Strand, 1906), and Pardosa pusiola (Thorell, 1891) are reported from
Laos for the first time.