Key to the species of Brachycoleus

1. Pronotum and hemelytra with distinct black marks. Cuneus orange, hair of hind tibiae almost as long as the spines, 2nd antennal segment about 2 times as long as width of head. ...................................... B. steini

— Pronotum and hemelytra without distinct black marks. [Other characters variable]. .............................. 2

2. Pronotum bright, with 1 or 3 small dark longitudinal stripes. Corium pale, each with only a narrow dark longitudinal stripes on clavus and on the radial artery. ................................................................. B. lineellus

— Pronotum bright, without dark longitudinal stripes. Corium not as above. ........................... B. caucasicus