NO. IO COCKROACHES—ROTH AND WILLIS 71 
Polyphaga saussurei, U.S.S.R. (Zmeev in Pavlovskii, 1948): The 
organism was fed mixed with bread and human feces. It passed 
through the insect unchanged. 
Shigella paradysenteriae (Collins) Weldin 
Synonymy.—Bacillus dysenteriae (Flexner) of Macfie. B. flexnert 
of Pavlovskii. 
Disease.—Dysentery in man; summer diarrhoea in children. 
Natural vectors—Shelfordella tartara, Tadzhikistan (Zmeev, 
1940): The organisms were isolated in a viable state from the stom- 
ach of the cockroach. This cockroach occurs in houses in Central Asia 
where it may play some part in maintaining domestic foci of the dis- 
ease. Pavlovskii (1948) stated that Zmeev isolated Flexner’s dysen- 
tery bacillus from four cockroaches of this species caught in a food 
cupboard in a hospital. 
Experimental vectors ——Periplaneta americana, Gold Coast Colony 
(Macfie, 1922): The organism was not recovered in the feces. 
Polyphaga saussurei, U.S.S.R. (Zmeev in Pavlovskii, 1948) : When 
the organism was fed in bread and human feces, it passed through the 
insect unchanged. 
Cockroaches, Venezuela (Tejera, 1926): The organism was re- 
covered from feces 24 hours after an experimental feeding but not 
after 4 days. 
Family PARVOBACTERIACEAE 
Brucella abortus (Schmidt and Weis) Meyer and Shaw 
Disease-—Cause of infectious abortion in cattle, mares, sheep, 
rabbits, guinea pigs, and all other domestic animals except hogs. 
Causes undulant fever in man. 
Experimental vectors —Periplaneta americana, U.S.A. (Ruhland 
and Huddleson, 1941): Organism did not remain alive in intestinal 
tract of cockroach for more than 24 hours. 
Malleomyces mallei (Zopf) Pribram 
Synonymy.—‘‘Bacillo della morva” of Cao. 
Disease.—Glanders in horses, other domestic animals, and man. 
Experimental vectors.—Blatta orientalis, Italy (Cao, 1898): This 
organism passed unchanged through the gut with the feces and re- 
tained its virulence. 
