In synonymy:
Paratheridula arcadica (Gertsch & Archer, 1942, T from Allotheridion) = Paratheridula perniciosa (Keyserling, 1886) (Levi, 1957a: 21, sub Mysmena quadrimaculata)
Paratheridula quadrimaculata (Banks, 1896) = Paratheridula perniciosa (Keyserling, 1886) (Levi, 1966b: 130)