_Blatta orientalis_, U.S.A., Massachusetts (Thaxter, 1902, 1908); Locality? (Spegazzini, 1915); France? (Picard, 1913). _Periplaneta americana_, Bermuda and U.S.A., Massachusetts (Thaxter, 1902, 1908); Plains of Biajar, Italian Somaliland, and Argentina (Spegazzini, 1915, 1917). _Periplaneta australasiae_, Bermuda (Thaxter, 1902, 1908). _Periplaneta brunnea_, Brazil (Thaxter, 1931). _Periplaneta_ sp., Mexico, West Indies, Panama, Brazil, Africa, South Seas, and China (Thaxter, 1902, 1908). Cockroaches, Belgium (Collart, 1947). Additional locality records: Grenada, Trinidad, B.W.I., and Tangier (Thaxter, 1931). The fungus was found growing on spines, tegmina, integument, and antennae, at times abundantly. _Experimental hosts._--All the following data are from Richards and Smith (1954): _Blatta orientalis_: A few plants matured. _Neostylopyga rhombifolia_: Some development but no mature plants. _Periplaneta americana_: Fungus developed prolifically with a density equal to that on original host. _Periplaneta australasiae_: Some development but no mature plants. _Periplaneta brunnea_: Fungus developed prolifically with a density equal to that on original host. =Herpomyces phyllodromiae= Thaxter _Natural host._--"_Phyllodromia_" sp., Abyssinia (Thaxter, 1905, 1908): On antennae. =Herpomyces platyzosteriae= Thaxter _Natural host._--"_Eurycotis floridana_," Mexico (Thaxter, 1905, 1908): On antennal setae. Since this cockroach is not found in Mexico (J. A. G. Rehn, personal communication, 1957), _E. floridana_ is undoubtedly not the host for this fungus. W. B. Brown (personal communication, 1957) searched the cockroach collection at the Museum of Comparative Zoology but was unable to find Thaxter's insect for reidentification. =Herpomyces stylopygae= Spegazzini _Natural hosts._--_Blatta orientalis_, Argentina (Spegazzini, 1917); U.S.A. (Richards and Smith, 1955a). _Experimental hosts._--_Neostylopyga rhombifolia_ (Richards and Smith, 1954): A few plants matured. _Pycnoscelus surinamensis_ (Richards and Smith, 1954): Some development but no mature plants. The fungus (fig. 1) is found on antennae (pl. 27, B, C), palpi, cerci, and femurs. Thaxter (1931) believed _H. stylopygae_ to be synonymous with _H. periplanetae_. However, Richards and Smith (1954) concluded that _H. stylopygae_ would not grow on _P. americana_ under their laboratory conditions although _H. periplanetae_ would grow on _B. orientalis_. This indicated a strain or species difference between the two fungi. Gunn and Cosway (1938) reported a species of _Stigmatomyces_ on the antennae of _B. orientalis_; this fungus was probably _H. stylopygae_ (Richards and Smith, 1956). =Herpomyces supellae= (Thaxter) _Natural host._--_Supella supellectilium_, Trinidad (Thaxter, 1931): On antennal spines. =Herpomyces tricuspidatus= Thaxter _Natural hosts._--_Blaberus craniifer_, U.S.A., Key West (Richards and Smith, 1955).