Bill stout, of moderate length, about as long as the long hind-toe without the claw; frontal shield pointed behind, much larger in males than in females, and in the breeding-season terminating on the vertex in a fleshy horn-like peak. All toes long, the middle toe, without claw, longer than the tarsus. The 2nd, 3rd, and 4th quills subequal, the 3rd generally slightly the longest, 1st between the 6th and 8th in length. Sexes dissimilar, males larger than females.
A single species.