Lampetis dilaticollis is a beetle of the family Buprestidae.

Lampetis dilaticollis can reach a length of about 21–32 millimetres (0.83–1.26 in).

Elytra, pronotum and antennae are black with blue and violet tinge.

Elytra show brassy-cupreous punctures and impressions.

The surface of the pronotum is smooth, without punctures.