The term 'myrmecologist's subject' is referring to the study of ants. Myrmecology is the scientific study of ants, and myrmecologists are scientists who specialize in this field. Ants are a diverse group of insects that have been studied for centuries due to their complex social behavior and their ability to form large colonies. Myrmecologists study the behavior, ecology, and evolution of ants, as well as their interactions with other organisms.