﻿AbstractA new species of the carabid beetle genusBembidionLatreille is described from the Central Valley, Los Angeles Basin, and surrounding areas of California.Bembidionbrownorumsp. nov.is a distinctive species, a relatively large member of the subgenusNotaphusDejean, and withinNotaphusa member of theB.obtusangulumLeConte species group. It has faint spots on the elytra and a large, convex, rounded prothorax. Of the 22 specimens from 11 localities, all but one were collected more than 55 years ago. Although the collection of the holotype in 2021 at UV light suggest the species is still extant, the lack of other recent specimens suggests the species may have a more restricted distribution than in the past, and its populations may be in decline.