The gills are notched, crowded, pallid or rufescent, narrow.
The gills are annulato-adnexed, distant, rufescent with a yellow tinge.
The rufescent ant has lost even the very power of feeding itself.
Similar to No. 758, but back, tail, and flanks without brownish or rufescent tinge.
Above dusky slate colour with rufescent tips to the fur; beneath paler, with a faint rufous ...