Ce. Carlton, A NEW SPECIES OF PSEUDACTIUM CASEY FROM ARKANSAS (COLEOPTERA, STAPHYLINIDAE, PSELAPHINAE), The Coleopterists bulletin, 49(2), 1995, pp. 170-173
The second species of Pseudactium Casey from Arkansas, P. ursum, new s
pecies, is described from three male specimens collected in mature dec
iduous forest near the Buffalo River, Newton County. Pseudactium ursum
resembles P. parabolicum, but differs in anatomical details of the tr
ochanters, abdomen, and aedeagus. A modification to a recently publish
ed key is provided that allows separation of P. ursum from the ten oth
er described species of Pseudactium. Pseudactium ursum is the only kno
wn pselaphine species that is precinctive to the Ozark Plateau.