Bactrianus
Could not find Bactrianorumque in Logeion dictionaries.
Bactrianorumque Proper-name adjective: neuter genitive plural, Proper-name adjective: masculine genitive plural of Bactrianus
Bactrĭānus, (12) a, um, c. Bactrenus : Curt. 6, 6, 18 || -ī, ōrum, m. , c. Bactri : Curt. ; Sen. Const. 13, 4.