Arista

A very distinct species. Habit of Brachystephium scapigerum D. C.: but that ought to have no aristae to the achenium: here the awns are very stout in proportion to the size of the capitulum.

The eyes of the male are separated by a distance equal to one-fourth of the diameter of the head, in the female by one-third. The frontal stripe is black, the cheeks and margins of the orbits silvery-white. The antennæ are black, the arista feathered on the upper side only.