Solenopsis xyloni (Southern Fire Ant)

The round object on the mesquite leaflet in this picture is a gland that secretes a sugary solution. Ants will flock to these extrafloral nectaries to feed when the glands are active.
The round object on the mesquite leaflet in this picture is a gland that secretes a sugary solution. Ants will flock to these extrafloral nectaries to feed when the glands are active.