Rhacophorus modestus is a species of frog in the family Rhacophoridae endemic to Sumatra, Indonesia. Its common name is Boulenger's flying frog. It is only known from the type series collected from a montane forest on the Mount Kerinci, within the Kerinci Seblat National Park. Habitat loss is occurring on the lower slopes of the mountain. References modestus Amphibians of Indonesia Endemic fauna of Indonesia Fauna of Sumatra Taxonomy articles created by Polbot Amphibians described in 1920