• Bembidium zephyrum Fall 1910. Holotype male in MCZ. Type locality Humboldt County, California.
• Bembidion zephyrum tristiculum Casey 1924
• Bembidion marginosum Casey 1924

No geographic variation noted in external features. However, the length of the second stylomere in females varies considerably, with specimens from north of Bandon, Oregon, having much longer stylomeres than specimens in northern California.

Compare with:

• Bembidion levettei

For a discussion of the traits distinguishing B. zephyrum from B. levettei, see Separating B. zephyrum from B. levettei.

On the west cost of North America, from British Columbia south to central California:

Male genitalia with Ventral Sclerite Patch usually without the distinctly angulate and sclerotized dorsal ridge of related species.

Left: Lateral view.Right: Central Sclerite Complex

A wide, flat species, with extensive, distinct mirrors. Anterior mirrors of elytra connected to rest of mirrors only by fainter mirrors on interval 3. Midlateral pronotal seta present.Lateral margin of prothorax explanate, especially toward the prominent front angles:

Most specimens have been found on the beaches of the Pacific Ocean. In this habitat in Oregon they are common under driftwood on the beach: