Labidus nigrescens Cresson, 1872 Neivamyrmex schmitti (Emery, 1894) Neivamyrmex nigrescens is a North American species of army ant in the genus Neivamyrmex.

[1] The species is found in the United States and Mexico, and is the most widely distributed Neivamyrmex species in the United States.

Due to its wide range, it has become the most studied and well-known species in its genus.

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