A pair of longitudinal ridges extending between the antennal sockets from the clypeus towards the posterior head margin. They are very variable in length and strength of development, but often form the upper antennal scrobe margin.
Scratchpads developed and conceived by (alphabetical):
Ed Baker,
Katherine Bouton
Alice Heaton
Dimitris Koureas,
Laurence Livermore,
Dave Roberts,
Simon Rycroft,
Ben Scott,
Vince Smith
