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: Hokkaido, Honshu, Shikoku, Kyushu and Nansei Islands. Found in forest edges and grasslands from flatlands to mountains. Have four transparent wings and body shape is similar to dragonfly but the way this species fly is rather flattering and too delicate. Have fine net-like appearance wing veins and with white spots towards tips of fore wings. Larvae are also called as ant lion, Ari-jigoku in Japanese literally meaning hell for ants. Digs a pit on sandy ground where is no risks of rain. Place a food for ants at the bottom of a pit and wait for ants to get trapped. In Mt. Takao, found these pits on slopes covered by trees and under benches in mountain trails. Larvae create small cocoons to become pupa in sand and emerge to adults in summer.
●Length about 34 to 38 mm
●Adults Flight Season August to about September
●Length about 34 to 38 mm
●Adults Flight Season August to about September