NO. I0 COCKROACHES—ROTH AND WILLIS gI 
Order ASCAROIDEA 
Family ASCARIDAE 
Ascaris lumbricoides Linnaeus, 1758 
Common name.—Giant intestinal roundworm. 
Disease.—Ascariasis. 
Natural vectors —Periplaneta americana, South Africa, Vrededorp 
(Porter, 1930) : One specimen contained ova of Ascaris lumbricoides 
or Ascaris suum Goeze, 1782 (=Ascaris suilla), which indicates the 
ingestion of human or pig feces by the cockroach. 
Experimental vectors—Periplaneta americana, Gold Coast Colony 
(Macfie, 1922): The eggs passed unharmed with the feces of the 
insects for a day or two after feeding. In one experiment, feces 
passed 4 days after ingestion of the inoculated meal contained eggs 
which had developed slightly. India, Western Bengal (Chandler, 
1926): The cockroaches were fed human feces containing eggs of 
Ascaris (species not mentioned but presumably /umbricoides). Small 
numbers of eggs were recovered in the feces. 
Periplaneta americana, Pertplaneta australasiae, Neostylopyga 
(=Dorylaea) rhombifolia, Formosa (Morischita and Tsuchimochi, 
1926): Human feces containing Ascaris eggs were fed to these cock- 
roaches; 15 of 32 P. americana, 6 P. australasiae, and 6 N. rhombi- 
folia excreted viable eggs 1 to 4 days (P. americana) or 1 or 2 days 
after the inoculated meal. Eggs in cockroach feces that had remained 
dry for some hours developed when cultured. 
Ascaris sp. 
Disease.—Parasite of mammals. 
Natural vectors ——Blatta orientalis, Somaliland (Mariani and Besta, 
1936): 1 of 93 cockroaches examined contained ova of an undeter- 
mined species of Ascaris. 
Order STRONGYLOIDEA 
Family ANCYLOSTOMIDAE 
Ancylostoma caninum (Ercolani, 1859) Hall, 1913 
Disease—Common hookworm of dogs and cats in temperate 
climates. 
Experimental vectors.—Periplaneta americana, Netherlands (Ak- 
kerman, 1933): Cockroaches were fed dog feces containing eggs of 
A. caninum and A. ceylanicum or banana mixed with eggs of both 
worms. Five of ten cockroaches fed dog feces and four of eight 
