Key to US Cyphomyrmex species

Key to workers of Cyphomyrmex species known from the United States, modified from Snelling & Longino (1992).

1

 * Preocular carina straight mesally in front of eye; dorsum of petiolar node with a pair of lateral projects or teeth => Cyphomyrmex wheeleri


 * Preocular carina curved medially in front of eye; dorsum of petiolar node rounded, lacking projections or teeth => 2

2

 * Mid-pronotal tubercle pair absent => Cyphomyrmex flavidus


 * Mid-pronotal tubercle pair present => 3

3

 * Smaller species, head width 0.56mm or less; hairs in center of first gastral tergum closely appressed and mostly separated by more than their own lengths; median basal groove of first gastral tergum short and usually indistinct => Cyphomyrmex minutus


 * Larger species, head width more than 0.62mm; hairs in center of first gastral tergum coarse, not fully appressed, and mostly separated by less than their own lengths; basal groove of first gastral tergum distinct and more than twice as long as wide => Cyphomyrmex rimosus