antennal sockets entirely exposed

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Imaging technique: 

Antennal sockets entirely exposed, not covered even partially by frontal lobes. In Antkey, separates the species of Amblyoponinae and Cerapachyinae from those of Ectatomminae, Myrmicinae and Ponerinae. The antennal sockets of Antkey species in the Dolichoderinae, Formicinae and Pseudomyrmecinae are also always at least partially covered.

Eli Sarnat
Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith