BIOTIC ASSOCIATIONS OF COCKROACHES — ROTH & WILLIS I33 



Rhizopus nigricans Ehrenberg 



Natural vector. — Blaberus craniifer, U.S.A. (Wedberg et al., 

 1949) : From feces. 



Rhizopus sp. 

 Natural vector. — Periplaneta americana, U.S.A., Texas (McShan, 

 unpublished MS., 1953) : From feces. 



Syncephalastrum sp. 



Natural vector. — Periplaneta americana, U.S.A., Texas (McShan, 

 unpubUshed MS., 1953) : From feces. 



Order ENTOMOPHTHORALES 



Family BLASTOCYSTIDACEAE 



Blastocystis hominis Brumpt 



Natural vector. — Blatta orientalis, U.S.S.R. (Zasukhin, 1930) : 

 In hind gut in 40 percent of over 3,000 cockroaches. 



Blastocystis sp. 



Natural vectors. — Blatta orientalis, U.S.S.R. (Yakimov and Miller, 

 1922) : Found in the intestinal contents of 29 percent of 124 B. ori- 

 entalis. 



Cockroaches, Venezuela (Tejera, 1926). 



The placement of the following fungus is problematic. 



Coccidioides periplanetae Avrech 



Natural host. — Blatta orientalis, Germany (Avrech, 1931) : Found 

 in cells lining the lumen of midgut and caeca. The whole upper part 

 of the epithelium was filled with sporangia and spores. 



Class ASCOMYCETES 



Order ENDOMYCETALES 



Family SACCHAROMYCETACEAE 



Saccharomyces cerevisiae Hansen 



Natural vector. — Blaberus craniifer, U.S.A. (Wedberg et al., 

 1949) : In feces. 



Saccharomyces sp. 



Natural vector. — Blattella germanica, U.S.A. (Janssen and Wed- 

 berg, 1952) : Found consistently in alimentary tract of B. germanica 

 fed sucrose solutions. 



