Three new species ofStigmatomycesare described:Stigmatomyces inconstants, parasitic onNotiphila mesopleuralis(Canz. & Menegh.) (Ephydridae) from Zaire,S. rampinii, parasitic onActocetor margaritatusWied. (Ephydridae) from Senegal, andS. tethidis, parasitic onPseudorhicnoessa rattiiMunari (Tethinidae) from the Seychelles. New findings ofStigmatomyces micrandrusThaxter,S. purpureusThaxter,S. rugosusThaxter,S. trianguliapicalisMajewski andS. ventriosusThaxter are also reported.S. psilopaeThaxter andS. harantiiH. Dainat are placed in synonymy withS. rugosusThaxter.