Natural vector.—Periplaneta americana, U.S.A., Texas (McShan in Roth and Willis, 1957a): From feces.
Experimental vector.—Blatta orientalis, Italy (Cao, 1898): Organism passed unchanged through the gut of the insects.
Aspergillus sydowi (Bainier and Sartory) Thom and Church
Natural host.—Oötheca of Eurycotis floridana, U.S.A., Pennsylvania (Roth and Willis, unpublished data, 1952): On outer surface. Determination by Miss Mary Downing.
Aspergillus tamarii Kita
Natural host.—Oöthecae of Blattella germanica, U.S.A., Pennsylvania (Roth and Willis, unpublished data, 1952): On exterior surface. Determination by Miss Mary Downing.
Aspergillus sp.?
Natural and experimental vector.—Blattella germanica, on shipboard (Morrell, 1911): Isolated from feces. Experimentally Morrell also showed that the spores of the fungus could be recovered from feces of cockroaches that had fed on them.