Petiole and postpetiole nodes deeply pitted (Fig. a).
Tetramorium bicarinatum
Petiole and postpetiole nodes not deeply pitted (Fig. b).
T. grassii
Fig a Tetramorium bicarinatum petiole and postpetiole nodes deeply pitted. Image: April Nobile (Specimen: CASENT0060334). www.antweb.orgFig. b Tetramorium grassii petiole and postpetiole nodes not deeply pitted. Image: Will Ericson (Specimen: CASENT0100805). www.antweb.org