NO. IO COCKROACHES—ROTH AND WILLIS 87 
roaches were fed human feces containing many cysts and mobile forms 
of G. intestinalis, Within 24 hours the feces of 8 of 10 cockroaches 
contained cysts. Cysts were present in the feces of all insects ex- 
amined after 48 hours. Of 10 cockroaches killed after 8 days, 2 had 
mobile G. intestinalis in the intestines. Argentina (Bacigalupo in 
Tejera, 1926, p. 256): Cysts of G. intestinalis were eliminated by 
cockroaches in the same form as ingested. 
Giardia sp. 
Natural vectors—Cockroaches, Venezuela (Tejera, 1926): Cysts 
morphologically identical to those of Giardia (species not determined ) 
were found in the intestinal contents of 5 percent of the cockroaches 
captured in latrines. 
Class SARCODINA 
Order AMOEBINA 
Family ENDAMOEBIDAE 
Entamoeba histolytica Schaudinn 
Synonymy.—Endamoeba_ IMustolytica; Entamoeba dysenteriae. 
(Kudo, 1954, separated Entamoeba from Endamoeba by nuclear 
characteristics. ) 
Disease—Amoebic dysentery in man. 
Natural vectors——Periplaneta americana and/or Blattella ger- 
manica, Cairo, Egypt (DeCoursey and Otto, 1956): 9 of 217 cock- 
roaches collected in restaurants contained cysts morphologically re- 
sembling E. histolytica. Of 44 cockroaches collected in 2 villages, 5 
contained this protozoan. 
Cockroaches, Venezuela (Tejera, 1926) : Cysts resembling those of 
E. histolytica were found in the intestinal contents of cockroaches 
captured in the sewer of a hospital and in a kitchen near a latrine. Two 
young cats were fed milk containing feces from some of these cock- 
roaches ; both cats in a few days passed feces which contained amoebae 
of the Schaudinn type. 
Cockroaches (presumably including Blatta orientalis, Blattella ger- 
manica, Periplaneta americana, Periplaneta australasiae, and Supella 
supellectilium). Peru (Schneider and Shields, 1947): One hundred 
cockroaches were captured and the legs and intestinal contents of each 
were cultured. No protozoa were found on the legs, but E. histolytica 
was found in 7 percent of the cultures of intestinal tracts. 
Experimental vectors.—Blatta orientalis. Italian Somaliland (Mari- 
