_Natural hosts._--_Diploptera punctata_, Ascension Island (Thaxter, 1902, 1908): On antennae. This species also was infected experimentally (Richards and Smith, 1954). Cockroach, Fiji (Thaxter, 1931). =Herpomyces ectobiae= Thaxter _Natural hosts._--_Blattella germanica_, U.S.A., Massachusetts (Thaxter, 1902, 1908); Burma, Tenasserim (Spegazzini, 1915); Argentina, Buenos Aires (Spegazzini, 1917): On antennae. U.S.A., Minnesota (Richards and Smith, 1955): Scattered over entire body, wings. France? (Picard, 1913): On tibial spines. Chile and Philippine Islands (Thaxter, 1931). "_Ectobia_" spp., Zanzibar and Saint Kitts, B.W.I. (Thaxter, 1902, 1908): Possibly on species that are now in the genus _Blattella_ rather than in the genus _Ectobius_ as it is known today, because Thaxter also used the synonym _Ectobia germanica_ for the German cockroach, _Blattella germanica_. _Experimental hosts._--_Blattella germanica_ and _Blattella vaga_, U.S.A. (Richards and Smith, 1954). =Herpomyces forficularis= Thaxter _Natural hosts._--Cockroaches, Mauritius? and Fiji (Thaxter, 1902, 1908, 1931): On antennae. =Herpomyces gracilis= Thaxter _Natural host._--_Blattella humbertiana_, Philippine Islands, Luzon (Thaxter, 1931): On antennae. =Herpomyces grenadinus= Thaxter _Natural host._--Cockroach, Grenada, B.W.I. (Thaxter, 1931): On antennae of a "brown wingless blattid." =Herpomyces leurolestis= Thaxter _Natural host._--_Leurolestes pallidus_, British Guiana and Trinidad (Thaxter, 1931): On antennae. =Herpomyces lobopterae= Thaxter _Natural host._--_Loboptera_ sp., Argentina (Thaxter, 1931): On antennae. =Herpomyces macropus= Spegazzini _Natural host._--_Blaberus_ sp.?, Argentina (Spegazzini, 1917). Cockroaches, Peru, Puerto Rico, Ecuador, and Haiti (Spegazzini, 1915, 1917): Material previously assigned by Spegazzini (1915) to _H. paranensis_ was also placed by him in this new species. However, Thaxter (1931) believed that _H. macropus_ may be synonymous with _H. paranensis_, but he provisionally retained _H. macropus_ because he had not seen Spegazzini's material. =Herpomyces nyctoborae= Thaxter _Natural hosts._--_Nyctibora tomentosa_, U.S.A., Texas (Thaxter, 1905, 1908): On antennae. This cockroach is not established in Texas, and the specimen may have been misidentified (Gurney, personal communication, 1958). _Nyctibora_ sp., Argentina (Spegazzini, 1917): On antennae. =Herpomyces panchlorae= Thaxter _Natural hosts._--_Panchlora nivea_, Trinidad (Thaxter, 1931): On antennae. =Herpomyces panesthiae= Thaxter _Natural host._--_Panesthia lobipennis_, Ceylon (Thaxter, 1915): On antennae. =Herpomyces paranensis= Thaxter _Natural hosts._--_Blaberus_ sp.? Brazil (Thaxter, 1902, 1908): On antennae. _Blaberus_ sp., Brazil and Argentina (Spegazzini, 1917): On antennae. Cockroaches, Trinidad and Argentina (Thaxter, 1931). =Herpomyces periplanetae= Thaxter _Natural hosts._--_Blaberus_ sp.?, Argentina (Spegazzini, 1917).