Lewis & Short

1. portĭtor, ōris, m. [portus], a tollgatherer (at a seaport), a receiver or collector of customs, a custom-house officer (syn. telonarius), Plaut. Trin. 4, 4, 15; id. As. 1, 3, 7; Cic. Off. 1, 42, 150; id. Agr. 2, 23, 61; id. Rep. 4, 7, 20 (Non. 24, 22); they forwarded letters: epistulamad portitores esse delatam, Ter. Phorm. 1, 2, 100; cf.: portitorum simillimae sunt januae lenoniae; Si adfers, tum patent, Plaut. As. 1, 3, 88.
On account of their strict examinations, transf., a woman who pries into every thing, Plaut. Men. 1, 2, 8.