Tetrax Forster, Syn. Oat. Brit. Birds, p. 20 (1817).
Type by taut., Otis tetrax Linn.
This genus is now generally accepted by systematists. The birds are much smaller than in the preceding genus and the sexes are almost the same in size instead of having the males greatly exceeding the females. The various ornamental differences between the various Bustards hardly seem to be of generic value. The structure of the wing of Tetrax is remarkable, the fourth quill being narrowed on the outer web in the middle and on the inner web at the base and shorter than the primaries on either side of it.