Genus— TR IB ONYX. 
Tribonyx Du Bus, Bull. Acad. Roy. Brux., VII., p. 212 
(April, 1840). (Also spelt Tribonix.) T, mortieri. 
Brachyptrallus La Fresnaye, Rev. Zool., p. 231 (August, 1840) T, mortieru 
Microtribonyx Sharpe, Bull. B.O.C., I., p. xxix. (1893) .. T, ventralis. 
Bill very high and stout. No distinct frontal shield. Nostrils oval, pervious ; 
occupying the fore-part of the nasal groove. Tarsi longer than the middle 
toe. Otherwise characters much as in Gallinula. Only two species known. 
Distribution. Confined to Australia and Tasmania. 
NoTE.—Sharpe separated the two species belonging to this genus, on account of the 
greater development of the wings in one case. No one can, however, accept such slight 
characters as of generic value in this family, and I have used them in conjunction with 
other characters as of only sub-specific value in some cases. 
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