Fruit flies (Diptera: Tephritidae) are among the most important pests of fruits and vegetables. In this study, the typology, number, size, and distribution pattern of sensilla on tarsi and ovipositors of six fruit fly species, including Bactrocera Cucurbitae Coquillett, Bactrocera diaphora (Hendel), Bactrocera dorsalis Hendel, Bactrocera minax (Enderlein), Bactrocera scutellata (Hendel), and Bactrocera tau (Walker), were analyzed by scanning electron microscopy techniques. The tarsi of these six fruit fly species are equipped with three types of trichoid sensilla (1, 2, and 3), chaetica sensilla, and basiconic sensilla. Two types of sensilla, trichoid sensilla (4 and 5) and campaniform sensilla, are identified on the ovipositors of the female fruit files. In addition, the possible functions of these sensilla are discussed in light of previously published literature, and the trichoid sensilla (1, 2, and 3) on the tarsi, and trichoid sensilla (4 and 5), as well as campaniform sensilla on the ovipositors are considered as mechanoreceptor. The basiconic sensilla might have an olfactory function, and the chaetica sensilla were suggested as a mechano- or olfactory / gustatory neurons. Future functional tarsi and ovipositors morphology and electrophysiological of tarsi and ovipositors studies are needed to confirm these proposed functions.