Generic diagnoses to all stages of the genus Propsilocerus Kieffer, 1923 (= Tokunagayusurika Sasa, 1978, syn. n.) are given. Parsimony analyses of the primitive orthoclads show that either the more plesiomorphic genera of Orthocladiinae form a monophyletic group or Propsilocerus may be more closely related to less plesiomorphic groups. Chasmatonotus Loew forms its likely sister group. The genus is monophyletic in all cladograms. A synapomorphic diagram for Propsilocerus shows P. sinicus sp. n. forming the sister species of the other four species. Keys are given to all stages. Propsilocerus sinicus is described from male and female imagines and as pupa; P. akamusi (Tokunaga) is redescribed in all stages and in all larval instars; P. taihuensis (Wen, Zhou & Rong) comb. n. as male and female; P. paradoxus (Lundström) as male, female and pupa; and P. lacustris Kieffer is described in all stages.