The gills are annulato-adnexed, distant, rufescent with a yellow tinge.
The gills are notched, crowded, pallid or rufescent, narrow.
Above dusky slate colour with rufescent tips to the fur; beneath paler, with a faint rufous tinge about the breast (Jerdon).
The rufescent ant has lost even the very power of feeding itself.
In the drawing the rufescent and normal plumages of the adults are so well delineated that no description seems necessary.
Similar to No. 758, but back, tail, and flanks without brownish or rufescent tinge.