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Plate-like covering of white grubs.

Spiracles

Plate-like covering of white grubs.

Shows how air enters the spiracles into the respiratory system of an insect.

Spiracles

Shows how air enters the spiracles into the respiratory system of an insect.

A toothed slit of a spiracle of the respiratory system of an insect.

Spiracles

A toothed slit of a spiracle of the respiratory system of an insect.

A spiracle of the respiratory system of an insect.

Spiracles

A spiracle of the respiratory system of an insect.

Conical spiracle set in a pit, protected by crossed hairs.

Spiracles

Conical spiracle set in a pit, protected by crossed hairs.

Crossed hair section of a spiracle in the respiratory system of an insect.

Spiracles

Crossed hair section of a spiracle in the respiratory system of an insect.

A lip-like spiracle of the respiratory system of an insect.

Spiracles

A lip-like spiracle of the respiratory system of an insect.

An unprotected round spiracle of an insect's respiratory system.

Spiracles

An unprotected round spiracle of an insect's respiratory system.

An unprotected slit-like spiracle of an insect's respiratory system.

Spiracles

An unprotected slit-like spiracle of an insect's respiratory system.

The Tracheal tube of an insect, showing the structure and methods of branching.

Tracheal

The Tracheal tube of an insect, showing the structure and methods of branching.