Appearance
This species is heavily built with strong greenish yellow bands and spots on its thorax and abdomen. The eyes are well-separated and greyish green in colour. Females are similarly marked. In males, the hindwing is 37 to 40 mm in length and the total body length ranges from 64 to 68 mm.Naming
SubspeciesIctinogomphus decoratus decoratus - Java, Sumatra
Ictinogomphus decoratus melaenops - from Thailand to Borneo

Distribution
Brunei Darussalam; Cambodia; China (Guangxi, Yunnan); Indonesia (Bali, Jawa, Kalimantan, Sumatera); Lao People's Democratic Republic; Malaysia (Peninsular Malaysia, Sabah, Sarawak); Philippines; Singapore; Thailand; Viet Nam
Behavior
It is often seen perching horizontally on the tips of twigs by the edge of reservoirs or lakes. Sometimes, they are seen patrolling along the shores of these water bodies. During the earlier part of morning, it often perches high in the trees, sunbathing in order to warm up. In the late morning, it comes down to the water. It does not enter forest and sometimes strays far from water.References:
Some text fragments are auto parsed from Wikipedia.
http://www.iucnredlist.org/details/167416/0http://lkcnhm.nus.edu.sg/dna/organisms/details/706