The Bidai Indians were a small tribe of southeastern Texas. They were allies of the Caddo tribes,
but may have been more closely related to the Akokisa, an Atakapa band.
The Bidais no longer exist as a separate tribe. They were devastated by an epidemic in the late 1700's, and most of the survivors were eventually
absorbed into the Atakapa and Caddo nations.
There are few remaining records of the Bidai language (only eight vocabulary words and their own name for themselves, Quasmigdo.)
The language is thought to have been related to Atakapa.