Key to US Gnamptogenys species

Key to workers of Gnamptogenys species known from the United States.

1

 * Body pale reddish brown; propodeum lacking spines; smaller, length 3.5-4 mm => Gnamptogenys hartmani


 * Body dark reddish black; propodeum armed with small spines; larger, length approximately 5 mm => Gnamptogenys triangularis