Tegmina in cockroach, arises from:

Two pairs of wings, forewings, and hindwings are present on the dorsal side. Forewings are the first pair of dark, opaque, thick, leathery wings that are protective in function. Hindwings are thin, broad, membranous, delicate, and transparent. These are attached to the tergum of the metathorax. These are helpful in flight and hence are also called true wings

Tegmina is the forewing of cockroaches and is called mesothoracic due to its origin.