Body length : 7-10mm.
Brachinus crepitans is difficult to distinguish from other species of this genus.
Coloration of the antenna and the abdomen are important to distinguish them.
Mainly found in open, warm habitats, such as sandy grasslands, dry slopes, ruderal areas, agricultural fields and gravel bars.
This species is capable of ejecting a hot chemical spray as a defense mechanism.
The larvae are predatory.