an anterior and a posterior articulation with the trochanter. The outer wall of the coxa is often marked by a suture extending from the base to the anterior trochanteral articulation. In some insects, the coxal suture falls in line with the pleural suture. In such cases, the coxa appears to be divided into two parts corresponding to the episternum and epimeron of the pleuron. The coxal suture is absent in many insects.

The inflection of the coxal wall bearing the pleural articular surface divides the lateral wall of the basicoxite into