The inner posterior notch on each side is more than half the length of the sternum. The hallux (hind toe) is raised above the level of the other toes and is short, its basal phalanx being shorter than that of the third or middle toe.
In Mr. Grant's British Museum Catalogue, as in Prof. Huxley's paper already quoted, this suborder is divided into two families— the Tetraonidae or Grouse, distinguished by having the nostrils and tarsi feathered and the toes feathered or pectinate; and the Phasianidae, with those parts naked. The latter are well represented in India, the Grouse being found only in the northern parts of both hemispheres. It is doubtful whether the differences between the two groups are sufficient to justify their distinction as families.