_Natural and experimental vectors._--_Blatta orientalis_, Italy (Cao, 1898, 1906). "=Bacillus=" _Natural infection._--_Blatta orientalis_, Germany (Heinecke, 1956): Disease organism found in the hemolymph of infected cockroaches. It can be spread by mouth and through wound infection. The animals died with symptoms of paralysis in 85-90 days. The organism has been isolated and is in the culture collection of the Institute for Microbiology and Experimental Therapy, Jena, under the numbers SG 896, Strain A; SG 897, Strain B; SG 898, Strain C. _Experimental infection._--_Blattella germanica_, Germany (Heinecke, 1956): Infected animals died in 26-30 days. _Periplaneta americana_ was unaffected even by heavy inoculations of the pathogen. "=Bacterium=" _Source._--(I) Diseased silkworm larvae. (II) Diseased _Ocneria dispar_ larvae and blood of _Blatta orientalis_. _Experimental infection._--(I)(II) _Blatta orientalis_, Europe (Filatoff, 1904): Organism pathogenic when injected, nonpathogenic when ingested. (I) Cockroach, U.S.A. (Glaser, 1925): Organism pathogenic to cockroach when injected. "=Coccobacillus=" _Natural infection._--_Blatta orientalis_, France (Hollande, 1934): Organism described morphologically. "=Colon bacilli=" _Natural vectors._--Cockroaches [presumably _Blatta orientalis_, _Blattella germanica_, and/or _Periplaneta americana_], Egypt (El-Kholy 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 (Vollbrechtshausen, 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). [cross] =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 periplaneticum_ Kunstler and Gineste, but it was believed that _S. blattae_ should be in the Spirochaetaceae rather than the Spirillaceae. "=Spirochaetoid bacteria=" _Habitat._--_Blatta orientalis_, France (Hollande, 1934): Two kinds described but not named. [cross] =Tetragenous= sp. _Natural and experimental infections._--_Periplaneta americana_, U.S.A. (Gier, 1947): Pathogenicity to the cockroach variable when organism injected. VIII. FUNGI AND YEASTS