A radiating bundle of strong nervures runs through it in the direction of its length and forms the framework of the fan, which is readily furled and unfurled.

The intervals are crossed by innumerable cross-nervures of slighter substance, which make of the whole a network of rectangular meshes.

The elytrum, which is heavier and much less extensive, repeats this structure.
At present nothing of this mesh-work is visible.

Nothing can be seen but a few wrinkles, a few flexuous furrows, which announce that the stumps are bundles of tissue cunningly folded and reduced to the smallest possible volume.
The expansion of the wing begins near the shoulder.

Where nothing precise could be distinguished at the outset we soon perceive a diaphanous surface subdivided into meshes of beautiful precision.
Little by little, with a deliberation that escapes the magnifier, this area increases its bounds, at the expense of the shapeless bundle at the end of the wing.