NO. 10 COCKROACHES—ROTH AND WILLIS 93 
cylostoma duodenale, Akkerman (1933) under Ancylostoma caninum, 
and Morischita and Tsuchimochi (1926) under Hookworms. 
Experimental vectors.—Periplaneta americana, Gold Coast Colony 
(Macfie, 1922): The eggs passed unharmed through the gut. See 
also comments after Macfie under Ancylostoma duodenale. 
Hookworms 
Disease —Human hookworm infections. 
Experimental vectors——Periplaneta americana, Periplaneta austral- 
asiae, and Neostylopyga rhombifolia, Formosa (Morischita and 
Tsuchimochi, 1926) : 9 of 21 P. americana, 3 of 7 P. australasiae, and 
3 of 6 N. rhombifolia, when fed with hookworm eggs, excreted viable 
eggs for I to 3 days after feeding. In fresh cockroach feces that were 
not yet dry, the eggs showed good development and often contained 
larvae which soon hatched. 
Family TRICHOSTRONGYLIDAE 
Trichostrongylus sp. 
Disease.—Intestinal parasites of birds, ruminants, and man. 
Natural vectors.—Blatta orientalis, Somaliland (Mariani and Besta, 
1936): I of 93 cockroaches examined contained ova of this parasite. 
Order TRICHUROIDEA 
Family TRICHURIDAE 
Capillaria hepatica (Bancroft, 1893) Travassos, 1915 
Common name.—The capillary liver worm. 
Disease.—Tissue parasite in the liver of domestic and wild mam- 
mals and occasionally in man. 
Experimental vectors——Blatta orientalis. According to Giordano 
(1950), the eggs of C. hepatica can pass unchanged through the in- 
testinal tract of the oriental cockroach, and therefore this insect could 
be a vector. Neveu-Lemaire (1933, 1938) considered Periplaneta 
americana as a probable vector of the eggs of this worm; there is no 
direct evidence to support this view, as far as we know. 
Trichuris trichiura (Linnaeus, 1771) Stiles, 1901 
Common name.—Human whipworm. 
Disease.—Trichocephaliasis or trichuriasis. 
Natural vectors.—Blatta orientalis, Somaliland (Mariani and Besta, 
1936) : Of 93 cockroaches examined, 4 contained ova of human whip- 
