The posterior margin of the head flat. Used in Antkey to separate the minor worker of Pheidole teneriffana from Pheidole obscurithorax (strongly convex) and Pheidole fervens (weakly convex).
Scratchpads developed and conceived by (alphabetical):
Ed Baker,
Katherine Bouton
Alice Heaton
Dimitris Koureas,
Laurence Livermore,
Dave Roberts,
Simon Rycroft,
Ben Scott,
Vince Smith
