Prepared by Donald R. Lewis and Laura Jesse, Department of Entomology, Iowa State University
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 Pharaoh Ant, Monomorium pharaonis 1/16 inch; 2 nodes, light yellowish red 12 antenna segments, w/ 3 segment club |  Larger Yellow Ant, Acanthomyops interjectus 1/4 inch; 1 node, Yellow-orange Very small eyes |
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 Thief Ant or Grease Ant, Solenopsis molesta 1/16 inch; 2 nodes Light brown to yellow 10 antenna segments, w/ 2 segment club |  Field Ant, Formica spp. 3/8 inch; 1 node Brown to black Thorax silhouette uneven in side view |
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 Odorous House Ant, Tapinoma sessile 1/8 inch; 1 node that is not easily seen Dark brown to black Abdomen slopes forward over node |  "Smaller" Carpenter Ant Camponotus nearcticus 1/4 - 1/2 inch; 1 node; Brown; red thorax Evenly rounded thorax |
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 Pavement Ant, Tetramorium caespitum 1/16 to 1/8 inch; 2 nodes Yellowish red; One pair of spines on thorax Sculptured lines on head |  Carpenter Ant, Camponotus pennsylvanicus 1/2 to 3/4 inch; 1 node Black Evenly rounded thorax |
