BIOTIC ASSOCIATIONS OF COCKROACHES — ROTH & WILLIS \2'] 



and Gohar, 1945) : From the outer surface, intestinal tract, and 

 suspensions of macerated insects. 



"Diplococci" 



Natural vectors. — Blatta orientalis, Germany (Jettmar, 1935) : 

 From intestinal tract. 



Blattella germanica, Germany (Jettmar, 1935) : From outer surface 

 of body. 



"Diphtheroid I and II" 



Source. — Periplaneta americana. 



Natural and experimental infections. — Periplaneta americana, 

 U.S.A. (Gier, 1947) : Pathogenicity to the cockroach variable when 

 organism injected. 



"Gram positive rods" 



Source. — Feces of Blattella germanica. 



Experimental vector. — Blattella germanica, Germany (Vollbrechts- 

 hausen, 1953) : Nonpathogenic to the insect when injected into the 

 mouth or anus. 



"Silkworm disease bacillus" 



Cockroaches that were inoculated with living cultures succumbed 

 in a few days (Glaser, 1925). 



t Spirillochaeta blattae Hollande 

 Habitat. — Blatta orientalis, France (Hollande, 1934; Hollande and 

 Hollande, 1946) : Organism found in hind intestine. This spirillum 

 was stated to be related in external morphology to Spirillum peri- 

 planeticum Kunstler and Gineste, but it was believed that S. blattae 

 should be in the Spirochaetaceae rather than the Spirillaccae. 



"Spirochaetoid bacteria" 



Habitat. — Blatta orientalis, France (Hollande, 1934) : Two kinds 

 described but not named. 



fTetragenous sp. 

 Natural and experimental infections. — Periplaneta americana, 

 U.S.A. (Gier, 1947) : Pathogenicity to the cockroach variable when 

 organism injected. 



VHI. FUNGI AND YEASTS 



By far the greatest number of fungi known to be associated with 

 cockroaches belong to the Laboulbeniaceae, genus Herpomyces, the 

 species of which are restricted to parasitizing cockroaches (Thaxter, 



