Zygonyx iris

Scientific name: Zygonyx iris Selys, 1869

Family: Libellulidae

Thai name: แมลงปอบ้านตามาเลย์, แมลงปอบ้านจุดตา

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When you go to waterfalls, The commonest dragonflies hovering above the stream is Zygonyx iris. Dr. Asahina places this species in subspecies Z. i. malayana. Because of its metallic green coloration, some think it's a corduliid species.

male

Young male has a metallic green body with pale stripes. As it ages, the synthorax turns to entirely metallic green. Abdomen is metallic black with yellow midsordal lines along the length of the abdomen. Female is similar to the male but stouter. This species is larger than those of the rare congener, Z. ida.  

female

You can see this species all parts of Thailand all the year.