Abstract: The study was conducted between June and September of 2010 in the region of the Dowon Valley of
Masan (Mt.), Goseong-gun, Gangwon-do in order to study the region's Beetles and Butterflies. The result of the
study showed a total of 66 species of 20 families, and the Staphyrinidae showed the highest species diversity at 20
species (30.3%). The result of the study using FIT method showed a total of 25 species of 10 families in terms of the
Coleoptera, and the Tympanophorus sauteri was found to be the dominant species at 767 counts. In terms of other
significant values by month, Dominance index was the highest in July at 0.94, while Evenness index and Diversity
index were the highest in June, at 0.76 and 1.75 respectively.
Key words: Mt. Masan, Gangwon Province, Korea