Mean (± SEM) volume and depth of the chambers, tunnel length, and composition of the population of each chamber according to its relative position for the 24 <i>E</i>. <i>ruidum</i> sp. 2 nests extracted using the paraffin wax technique.

* The average values reported for the ninth chamber concerning the number of workers and gynes, must be considered with reservation because only one nest with nine chambers could be cast; they cannot be directly compared to the mean values found in the other chambers.