Genus— T ONOPHOYX. 
Tonophoyx Mathews, Austral Av. Rec., Vol. I., p. 195, 
1913 , . . . . . . . . . . . . . Type T. aruensis. 
Ardeene birds dissimilar to the two preceding genera in coloration, but 
having similar dorsal and breast-ornaments. The nuchal crest is however 
very much elongated, while the lanceolate breast-feathers form a much 
more dense ornamentation. 
The birds are smaller and the culmen is proportionately much longer 
and stouter ; it is much longer than one-fourth the length of the wing and 
almost as long as the tail. The wing has much the same formula, which 
appears to occur throughout the Ardeidce with very little variation. 
The tail is long, more than one-third the length of the wing. 
The legs are long and the metatarsus nearly equals the tail in length 
while it does not greatly exceed the culmen. 
The toes are typically Ardeine. 
I have indicated the differences between this genus and Notophoyx and 
Ilyola, and would emphasize the extraordinary distinction between the 
immature of this genus and those of the others, as showing that there is 
probably very little close relationship between this and the other species with 
which it has been hitherto associated. 
VOL. ni. 
445 
