BIOTIC ASSOCIATIONS OF COCKROACHES — ROTH & WILLIS II3 



Escherichia coli var. communior (Topley and Wilson) Yale 

 Natural vectors.— Blaherus craniifer, U.S.A. (Wedberg et al., 

 1949) : From feces. 



Escherichia freundii (Braak) Yale 



Habitat. — Soil, water, intestinal canal of man and other animals. 



Natural vectors.— Blaherus craniifer, U.S.A. (Wedberg et al., 

 1949) : From feces. 



Blattella germanica, U.S.A. (Janssen and Wedberg, 1952) : From 

 intestinal canal and feces. 



Periplaneta americana, U.S.A. (Bitter and Williams, 1949) : From 

 intestinal tract. 



Escherichia intermedium (Werkman and Gillen) Vaughn and Levine 

 Hahitat.—SoW, water, intestinal canal of man and other animals. 

 Natural vectors. — Periplaneta americana, U.S.A. (Bitter and Wil- 

 liams, 1949) : From intestinal canal. 



♦Klebsiella pneumoniae (Schroeter) Trevisan 

 Experimental vectors. — Blatta orientalis, Italy (Cao, 1898). 



* Paracolobactrum aerogenoides Borman, Stuart and Wheeler 

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

 berg, 1952). 



Periplaneta americana, U.S.A. (Bitter and Williams, 1949). 



♦Paracolobactrum coliforme Borman, Stuart and Wheeler 

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

 berg, 1952). 



Periplaneta americana, U.S.A. (Bitter and Williams, 1949)- 



♦Paracolobactrum spp. 



Natural vectors.— Blatta orientalis, U.S.A. (Olson and Rueger, 



1950)- 

 Blattella germanica, U.S.A. (Olson and Rueger, 1950). 



Periplaneta americana, U.S.A. (Bitter and Williams, 1949; Olson 

 and Rueger, 1950). 



♦ Paracolon bacilli 



Natural vectors. — Cockroaches [presumably Blatta orientalis, Blat- 

 tella germanica and/or Periplaneta americana], Egypt (El-Kholy and 

 Gohar, 1945)- 



