Mucor sp.
Natural host.—Oötheca of Periplaneta americana, U.S.A., Pennsylvania (Roth and Willis, unpublished data, 1952): Inside oötheca. Determination by Miss Mary Downing.
Pycnoscelus surinamensis, Germany (Bode, 1936): Isolated from fat body which it had stained red.
Rhizopus nigricans Ehrenberg
Natural vector.—Blaberus craniifer, U.S.A. (Wedberg et al., 1949): From feces.
Rhizopus sp.
Natural vector.—Periplaneta americana, U.S.A., Texas (McShan, unpublished MS., 1953): From feces.
Syncephalastrum sp.
Natural vector.—Periplaneta americana, U.S.A., Texas (McShan, unpublished MS., 1953): From feces.