A study on species diversity of arctiid moths was carried out in oil palm plantation and fragmented forest of PPB Oil Palm Plantation, Miri. The main method was by using four modified Pennsylvanian light traps that left functioning from 6.30 p. m to 10.30 p. m. A total of 34 species and 638 individuals from four subfamilies were recorded. Overall, the subfamily Lithosiinae represented by the highest species number followed by Syntominae, Arctiinae and Aganainae. Eight species identified as endemic to Borneo while six rare species
was also captured in this study. The Shannon- Weiner diversity indices (H') for each fragmented forest and oil palm plantation were same which were 2.840. There was higher number of total abundance and species abundance of arctiid moths in fragmented forest rather than in oil palm plantation. However, indices
indicated that there was no significant difference between the study sites due to the higher number of shared species were identified
