Sphenocercus Gray, List Gen. B., p. 57 (1840).
Type, Columba oxyura Reinw.
This genus is distinguished by having the third primary expanded in the middle and not scalloped, this expansion being quite definite in the type-form oxyurus, S. apicaudus and S. sphenurus. In all the other supposed species and subspecies of this genus the third primary is scalloped as in Dendrophasa and these birds seem to constitute another genus.
The bill is very like that of Dendrophasa but has the rhamphotheca occupying only about one-third of the total length; the tail is graduated and in one species the central tail-feathers are greatly lengthened; the under tail-coverts exceed the outer rectrices in length; an area of bare skin stretches from the base of the bill through the lores and round the eye.
Key to Species.
A.Central tail-feathers acuminated and extending two or three inches beyond the next pair.............S. apicaudus, p. 199.
B.Central tail-feathers not acuminate and only a little longer than the next pair...................S. sphenurus, p. 200.