Pseudomyrmex gracilis, also known as the graceful twig ant, Mexican twig ant, slender twig ant, or elongated twig ant, is a large, slender species native to Mexico and arid parts of the US.

The workers are about 8–10 millimeters (0.31–0.39 in) in length and generally wasp-like in appearance and style of movement.

Worker ants are bi-colored; the head and gaster are dark, while the antennae, mouthparts, thorax and legs are dull orange with dark shading.

[1] If the colony ever finds themselves without a queen, the worker ants form dominance hierarchies by boxing with their antennae.

This leads to a couple high ranking individuals which can lay eggs until a new queen returns.