Mt. Takao is considered one of the three major habitat of insects along with Minoo (Osaka prefecture) and Kibune (Kyoto prefecture) and it has long been loved by researchers of insects because of number of species and the easy access from the Metropolitan area. There are many insects first found in Mt. Takao and named after "Takao" such as Takao Shachihoko （Hiradonta takaonis Matsumura） and Takao medaka kamikiri (Stenhomalus takaosanus).
Main region: Wide areas of Hokkaido, Honshu, Shikoku and Kyushu.
In Calopterygidae family, body shape is the larger version of damselflies found in clear streams from flatlands to mountains and streams in mountains as its Japanese name Kawa-Tombo literally meaning river dragonfly states.
Front and back wing are almost the same size and fly flutteringly and elegantly.
Color of wings varies among species and regions from reddish brown, light orange to clear.
Body color at young adults is metallic shiny green but it turns powdery white with age.
Main foods are small insects at waterside.
Length about 55 to 60 mm
Adult Flight Season April to about August
In Calopterygidae family, body shape is the larger version of damselflies found in clear streams from flatlands to mountains and streams in mountains as its Japanese name Kawa-Tombo literally meaning river dragonfly states.
Front and back wing are almost the same size and fly flutteringly and elegantly.
Color of wings varies among species and regions from reddish brown, light orange to clear.
Body color at young adults is metallic shiny green but it turns powdery white with age.
Main foods are small insects at waterside.
Length about 55 to 60 mm
Adult Flight Season April to about August