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Thread: Polyura from Chiang Mai trip (7 -12 October 2019)

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  1. #1
    Join Date
    Nov 2010
    Location
    Malaysia
    Posts
    7,372

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    They are all correct except 4 should be P. athamas as well.

    P. athamas & arja can be confusingly similar.
    Both have broad or narrow bands, but typically broader in P. arja.

    The main difference is colour. P. arja being white or greenish on the upperside & P. athamas yellow or yellow green.

    P. athamas ;band more often narrow. FW distal margin strongly excavated with a distinct angle at vein 2, FW cellspot often two (variable).
    Underside band more strongly tinged yellow.
    http://www.flutters.org/home/photoga...icture&id=1145
    http://yutaka.it-n.jp/cha/60080001.html
    https://www.learnaboutbutterflies.co...00360-002b.jpg
    https://www.learnaboutbutterflies.co...08290-002b.jpg


    P. arja ;Upperside distinctly white or greenish white ;FW distal margin straighter. cellspot often one (variable).
    Underside band greenish white, may slightly yellow tinged; often wide & subapical spot rectangular.
    https://www.flickr.com/photos/monsoo...oi/11348423606
    https://commons.wikimedia.org/wiki/F...C_9781_(3).jpg
    https://live.staticflickr.com/1962/4...ca33acf4_b.jpg
    https://www.mostphotos.com/en-us/330...b-polyura-arja


    TL Seow: Cheers.
    O

  2. #2
    Join Date
    May 2019
    Location
    Singapore
    Posts
    122

    Default

    Noted with thanks, Dr Seow.

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