Srivani

The Srivani are a race of humanoids native to the Delta Quadrant. During it's time lost in the Delta Quadrant, the Starship Voyager encountered a group of Srivani scientists that were performing scientific experiments on the Voyager crew without their knowledge. 

In 2376, Julian Bashir listed the Srivani along with the Hirogen, Species 8472, and the Vaadwaur as species native to the Delta Quadrant that could be a potential threat to the Federation.