Body and prothorax relatively longer than in specimens from the mainland; elytra usually pale, with bigger and denser punctation; light specimens dominate in all populations, though rare black specimens are also known; the area along elytral suture, elytral margins and elytral apices are more or less darkened; 1st antennal joint and legs are pale.

Body length of available specimens, males: 6,6-7,8 mm, female 7,0 mm; width in males: 1,8-1,9 mm, in female: 2,0 mm

Russia, Kunashir island, Mendeleevo.

The subspecies is named in honor of Alexander Kompantsev.