Abstract
Steatonyssus longispinosus Wang, 1963,infesting the house bat, Pipistrellus abramus Temminck, is redescribed. The occurrence of Steatonyssus spinosus Willmann, 1936,and Steatonyssus superans Zemskaya, 1954,in Japan is recorded. The key for the differentiation of all the parasitic stages of these species is presented.