Key to US Acanthostichus species

Key to workers of Acanthostichus species known from the United States. Acanthostichus davisi is not included as it is known only from males.

1

 * Scapes and dorsal surfaces of the head and mesosoma densely punctate (head less so) => Acanthostichus punctiscapus
 * Scapes and dorsal surfaces of the head and mesosoma smooth and with at most very few scattered punctures => 2

2

 * Dorsum of petiolar node densely and finely punctate. Eyes relatively small and round => Acanthostichus arizonensis
 * Dorsum of petiolar node smooth. Eyes relatively large and elongate => Acanthostichus texanus