Pictorial key to the ant genera of Illinois

by N.C. Wilkins and S.B. Menke

Fig. 76 Tetramorium caespitum (antweb.org)

Fig. 77 Tetramorium caespitum (antweb.org)

Fig. 78 Stenamma brevicorne (antweb.org)

Fig. 79 Stenamma diecki (antweb.org)

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A Area of clypeus immediately in front of antennal sockets raised up into a narrow ridge or shield wall so that sockets appear to be placed within deep pits.

 

B Middle and hind tibial spurs simple or absent.

 

C In side view, dorsal node of petiole rounded or subquadrate.

 

...Tetramorium
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AA Area of clypeus immediately in front of antennal sockets usually flat and not raised up into a narrow ridge or shield wall.

 

BB If narrow ridge appears to be present, then middle and hind tibial spurs pectinate.

 

CC Dorsal node of petiole more or less triangular in side view.
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