Pictorial key to the ant genera of Illinois

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

Fig. 66 Trachymyrmex septentrionalis (antweb.org)

Fig. 67 Tetramorium bicarinatum (antweb.org)

20
A With head in side view, a sharply differentiated diagonal carina (ridge) present, extending up from mandible insertions to above the eye.

 

B Antennal club often absent.

 

C Head and body often with tubercles or spines.

 

...Trachymyrmex
20'
AA With head in side view, lacking diagonal carina running from the mandible insertions to above the eye, though longitudinal rugae may be present on sides and front of head.

 

BB Antenna often with a 2 or 3 segmented club.

 

CC Head and body lacking tubercles, but spines or teeth may be present.
21