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The wings of several kinds of dragonflies I've seen here in Taiwan all have an apparently special little pigmented spot near the ends of each wing.

Does this spot have a name and a function?

below x2: Taken today in Hsinchu county, Taiwan. Note arrows. I've also asked Identify these two large dragonflies in Taiwan?

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dragonfly from Hsinchu county Taiwan dragonfly from Hsinchu county Taiwan

below left: from Identify this black dragonfly with bluish coloration along its flat top, yellow on it's mid-body and green on its head below right: from Identify this black dragonfly with a bright bluish-white band around its body

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dragonfly from Hsinchu county Taiwan dragonfly from Hsinchu county Taiwan

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Pterostigma is what those spots are. Wikipedia article is at https://en.wikipedia.org/wiki/Pterostigma.

I read the summary of the technical article below.

The pterostigma are heavier than the rest if the wing, and so the insect can glide faster without a destabilising flutter beginning.

The author also believes that the pterostigma contribute to more efficient active flight.

Technical details at: Norberg, R. Åke. "The pterostigma of insect wings an inertial regulator of wing pitch". Journal of Comparative Physiology A. 81 (1): 9–22. doi:10.1007/BF00693547.

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