some evidence of division of labor or partitioning of social roles to some extent has been observed within this genus. an excavated nest of "a. metallica" in michigan led to the discovery of two female nest-mates with different levels of ovarian development that was determined not to be due simply to the age of the individuals. this was interpreted as strongly indicative of division of labor within this species, suggesting at least that individuals have varying levels of reproductive responsibility within a nest. this may be a larger pattern found within the social species of this genus.