Ephemeri vita, or, The natural history and anatomy of the Ephemeron, a fly that lives but five hours written originally in Low-Dutch by Jo. Swammerdam ...
Swammerdam, Jan, 1637-1680., Tyson, Edward, 1650-1708.
Figure 2.

The Female Worm as it is im∣mediately before its Change, is here shewn; in which the Wings are now visible, appearing through their Cases.

AA. The cases of the Wings; which appear through the same very visible. How these Wings appear, when the Case is shed, see in the 3d Table, fig. 1. in the letters hhh, where they are at large represented.