The Embiidae are feeble, somewhat soft-skinned insects with the prothorax small and the mesothorax and metathorax elongate.
Two pairs of wings are present in the vast majority of insects, borne respectively on the mesothorax and metathorax.
The three segments which make up the thorax or foretrunk are known as the prothorax, mesothorax and metathorax (see fig.
A remarkable feature is the frequent concrescence of mesothorax and metathorax and in some cases, even, their fusion with the anterior abdominal segments.
The prothorax is short and the mesothorax very long, the three pairs of legs closely similar, the wings often highly modified or absent, and the cerci short and unjointed.
The mesothorax and metathorax are rather intimately fused together.
The males are very small, free-flying insects with the prothorax, mesothorax and elytra greatly reduced, the latter appearing as little, twisted strips, while the metathorax is relatively large, with its wings broad and capable of longitudinal folding.
The tergal regions of the mesothorax and of the metathorax are hidden under the pronotum and the elytra when the latter are closed, except that the mesothoracic scutellum is of ten visible - a small triangular or semicircular plate between the bases of the elytra (fig.