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Ant key 30

Forward sections of the frontal lobes and the base of the antennae widely separated by the broadly rounded or triangular rear section of the clypeus that extends between the frountal lobes (Fig. a).    31
Forward sections of the frontal lobes and the base of the antennae very close together and at most separated by a very narrow triangle of the clypeus that extends rearwards between them (Fig. b). 33
Fig. a [Rhytidoponera chalybaea] head. Image: April Nobile (Specimen: CASENT0172343). www.antweb.org Image
Fig. a Rhytidoponera chalybaea head. Image: April Nobile (Specimen: CASENT0172343). www.antweb.org
Fig. b [Austroponera castanea] head. Image: April Nobile (Specimen: CASENT0172341). www.antweb.org Image
Fig. b Austroponera castanea head. Image: April Nobile (Specimen: CASENT0172341). www.antweb.org