Clausena (C.) excavata (Rutaceae) is a wild shrub that is used as a folk medicine in the treatment of snakebites, abdominal pain and as a detoxificant. In continuation of our investigations on carbazole alkaloids from the Rutaceae plants of Taiwan, the acetone extract of the root bark of C. excavata was subjected to repeated chromatography on silica gel to give four new lactonic carbazole alkaloids, clausevatine-D (1), -E (2), -F (3) and -G (4), and the known alkaloid, clausamine-A (5). We report herein the structural elucidation of these new compounds by spectroscopic analyses.