Natural vector.—Periplaneta americana, India (Chandler, 1926).
Experimental vector.—Periplaneta americana, Gold Coast Colony (Macfie, 1922).
* Hookworm ova
Experimental vectors.—Periplaneta americana, Periplaneta australasiae, Neostylopyga rhombifolia, Formosa (Morischita and Tsuchimochi, 1926).
Family TRICHOSTRONGYLIDAE
* Trichostrongylus sp.
Natural vector.—Blatta orientalis, Italian Somaliland (Mariani and Besta, 1936).
Order TRICHUROIDEA
Family TRICHURIDAE