Favoritos de clurarit

Small ants approximately 6mm in length. This particular nest has been in the same location for at least 26 years. (At the time of the property purchase). During the morning hours they cluster together tightly into one large mound of approximately 4 or 5cm in diameter and 1 cm thick. On a few occasions I observed the mound of ants resembling the size and shape of a table tennis ball. After mid day they essentially disappear under ground. Very slow moving.

Keyed to A. brevispinosus using Utah key (junior synonym of tristani)

Thanks to Mettcollsuss for narrowing this to genus

I accidentally collected these two workers while collecting a colony of Monomorium "marjoriae"