Pictorial key to the ant genera of Illinois

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

Fig. 56 Neivamyrmex nigrescens (antweb.org)

Fig. 57 Tetramorium caespitum (antweb.org)

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A Antennal sockets completely exposed in full-face view, not covered by frontal lobes.

 

A' Antennal sockets closely approximated, inserted at the anterior margin of the head.

 

B Clypeus reduced.

 

C Eye either a single facet or absent.

 

...Neivamyrmex
17'
AA In full face view, antennal sockets covered at least in part by frontal lobes.

 

AA' Antennal sockets usually well separated and set back from the anterior margin of the head at or near the posterior border of the clypeus.

 

BB Clypeus developed.

 

CC Eye usually present, often with several facets or more.
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