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).
Blaberus sp. and Epilampra? sp., Panama (Thaxter, 1902, 1908).