Richards and Smith (1956) concluded that there is no evidence of pathogenicity in _Herpomyces_ infections because heavily infected cockroaches appear fully active in laboratory colonies; they can run at the same speed as uninfected cockroaches; they reproduce normally and do not appear to die prematurely. These workers stated that the infections cause a dermatitis which is neither pathogenic nor debilitant. So far as we know there are no comparative data on longevity and reproductive performance of fungus-infected versus normal cockroaches. However, Gunn and Cosway (1938) have shown that the presence of these fungi (identified as _Stigmatomyces_ sp.; see p. 138) on the antennae seemed to interfere with the humidity reactions of _Blatta orientalis_. Although Richards and Smith (1956) admit that humidity receptors and other sense organs on the antennae may be destroyed by the fungus, they state that "insects possess such a large number of sensilla that the result may well be more distressing to the sensory physiologist than to the insect." Yet it seems to us that the loss of sense organs from fungal infection and concomitant shortening of the antennae (pl. 27, A) might be considerably more of a handicap to free-living cockroaches than those in laboratory colonies. Bode (1936) studied the flora of _Periplaneta americana_ and cultured Aspergillaceae and Mucorinae from the insect's body surface and intestinal contents; he also found nonsporulating yeasts in _P. americana_. To prevent fungal growth on oöthecae of _P. americana_, Griffiths and Tauber (1942a) autoclaved their rearing containers and dipped the oöthecae in 70-percent alcohol for 10 seconds. Mercier (1906) isolated and cultured a pathogenic yeastlike parasite which had invaded the fat body and blood of _Blatta orientalis_. The abdomens of the infected insects became swollen, distended, and soft. McShan (unpublished MS., 1953) consistently isolated Saccharomycetes from the feces of _Periplaneta americana_. FUNGI ASSOCIATED WITH COCKROACHES The use of the asterisk (*) is explained in footnote 3, page 4. Phylum THALLOPHYTA Class FUNGI IMPERFECTI Order MONILIALES Family PSEUDOSACCHAROMYCETACEAE =Candida zeylanoides= (Castellani) Langeron and Guerra _Natural host._--Oötheca of _Blatta orientalis_, Italy (Ronzoni, 1949). =Torulopsis= sp. _Natural host._--Oötheca of _Blatta orientalis_, Italy (Ronzoni, 1949). Family MONILIACEAE =Spicaria prasina= (Maublanc) Sawada _Natural host._--_Ischnoptera rufa rufa_, Puerto Rico (Wolcott, 1950): A dead specimen of this cockroach was found stuck to a leaf and covered with this fungus. =Aspergillus flavus= Link _Natural hosts._--Oöthecae of _Blattella germanica_ and _Eurycotis floridana_, U.S.A., Pennsylvania (Roth and Willis, unpublished data, 1952): On outer surface. Determination by Miss Mary Downing.