The posterior angle is acute, and slightly channeled anteriorly.

Inner posterior angle formed at base of radial cell right or obtuse.

The posterior angle is intermediate in length between the superior and the anterior.

The posterior angle is with a decided notch.

The posterior angle is rendered obtuse by the tabulation.

The posterior angle is acute, with a moderate channel anteriorly.

The posterior angle is obtuse; The outer lip is thin.

It is channeled at the posterior angle, which is obtuse.

The posterior angle is occupied by a heavy callus.

The parietal wall has a more or less white callus, and is decidedly thickened near the posterior angle.