Key to US Myrmecina species

Key to United States species of Myrmecina based on workers, modified from Deyrup (2015).

1

 * Postpetiole concave below, lacking a conspicuous protrusion => Myrmecina americana


 * Postpetiole with a conspicuous forward-pointing protrusion => 2

2

 * Conspicuous parallel carinae on front of head and pro- and mesonotum; length 2 mm or less; color dark reddish brown => Myrmecina cooperi


 * Lacking parallel carinae on front of head and pro- and mesonotum; length over 2 mm; color pale reddish brown => Myrmecina sp. (Fisher & Cover 2007)