A Antennal sockets closely approximated; median posterior portion of clypeus forming a narrow, finger-like lobe extending rearwards between the two frontal lobes.

 

B Tibial spur simple.

 

C Antennal scape gradually and evenly bent as it approaches the insertion.

 

...Stenamma

AA Antennal sockets not closely approximated; median posterior portion of clypeus forming a triangular or broadly rounded shape extending rearwards between the frontal lobes.

 

BB Tibial spur pectinate.

 

CC Antennal scape often sharply bent near insertion; the bend frequently features a conspicuous ridge or lamina.

 

...Myrmica