Denebian
Denebians were a space-faring species from the planet Deneb V in the Alpha Quadrant. 

Harry Mudd considered them to be a "struggling young civilization" from a "backward planet" when he sold them all rights to a Vulcan fuel synthesizer in 2267. The Denebians contacted the Vulcans and discovered the deal was a fraud, and Mudd was arrested, causing Mudd to conclude that they had "no sense of humor". He was given the choice of several forms of capital punishment, but since none appealed to him, he escaped. ()

External link 
 
ja:デネビアン
Species