The head length is approximately equal to the head with. Used in Antkey to separate the major worker of Pheidole teneriffana from that of Pheidole fervens.
Scratchpads developed and conceived by (alphabetical):
Ed Baker,
Katherine Bouton
Alice Heaton
Dimitris Koureas,
Laurence Livermore,
Dave Roberts,
Simon Rycroft,
Ben Scott,
Vince Smith
