Orthetrum glaucum

Scientific name: Orthetrum glaucum (Brauer, 1865)

Family: Libellulidae

Thai name: แมลงปอบ้านเสือหน้าดำ, แมลงปอบ้านเสืออกขาวคู่

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Orthetrum glaucum is a common libellulid species mostly found around the stream or waterfall. Two years ago I were surprised to see teneral male in open area between rows of mango trees and paddy fields. 

adult and old male

There is another similar one, O. luzonicum, which confuses many beginners. O. glaucum differs from O. luzonicum: eyes are dark green (O. luzonicum has bright green eyes), larger size, dark clypeus (O. luzonicum has a white clypeus), markings on front of synthorax are different, wingbase is darken and base of abdomen is less concaved.

young and old female

Teneral male is dark body with blue pruinosed abdomen. Dark green eyes and clypeus. Markings on synthorax paler and there pale stripes on synthorax. Wing base is darken. Fully grown male is pruinosed all of the body and abdomen. Teneral female is yellow body and darken as it ages. Old female is pruinosed. Female of this genus is very hard to identify by exteral features. Examing valvala vulae will reveal its identity.

copula

You can see this species in forest and lowland area all the year.