Why are the fore wings of cockroach called tigmina ?

Explanation

### Step-by-Step Solution:

1. **Definition of Tegmina**: The forewings of cockroaches are referred to as "Tegmina." This term specifically describes a type of wing that is thick and leathery in texture.

2. **Function of Forewings**: The primary function of the forewings (Tegmina) is to provide protection rather than to facilitate flight. They serve to cover and shield the more delicate hind wings, which are responsible for flying.

3. **Location of Forewings**: The forewings are located on the dorsal (upper) part of the cockroach's body. This positioning is significant in understanding their role and structure.

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