California's fourth breeding atlas—and the first for southern California—this volume reports on data collected from 1985 to 1990, plus selected records through 1994. Dividing the county into 5 x 5-km squares yielded 61 full and 50 partial blocks, a respectable 79 percent of which Gallagher deems to have been covered to a "good" or "excellent" degree. Because the Santa Ana Mountains account for most of the area afforded "poor" to "marginal" coverage, I expect that exciting discoveries still lurk in this poorly known range.