Temognatha variabilis can reach a length of about 35 millimetres (1.4 in).

The body colour is highly variable, ranging from yellowish to dark red.

The thorax usually show a median black area with yellow or bright red markings on each side.

Head and legs are black with greenish reflections.

[2] Larvae live in She-oak tree of Casuarina species (Casuarinaceae).