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Thread: Re-examination of my Arhopala atrax from northern Thailand

  1. #1
    Join Date
    Dec 2016
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    Thailand
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    Default Re-examination of my Arhopala atrax from northern Thailand

    Following on from my two postings on the Arhopala species encountered at Omkoi, northern Thailand, and in light of the feedback, it was evident that I should take a second look at the supposed Arhopala atrax in my collection. The seven individuals (8 photos) below were all photographed in northern Thailand. I think several of these are wrong, and would be interested in the correct identifications.
    With thanks.

    Image 1. This from Chiang Dao, and it was the subject of an earlier posting on ButterflyCircle, and identified as A. atrax. I see the outer edge of the forewing band is lunulated, though the inside edge appears not so well lunulated.
    b5380 Indian Oakblue (Arhopala atrax) - Chaing Dao 01.JPG

    Image 2. From Doi Inthanon. I think A. alax.
    b5380 Indian Oakblue (Arhopala atrax) - Doi Inhtanon 01.JPG

    Image 3. From Mae Ping. Presumed to be A. alax.
    b5380 Indian Oakblue (Arhopala atrax) - Li 01.JPG

    Image 4. From Chiang Mai. Presumed to be A. alax, though the forewing band looks quite wide.
    b5380 Indian Oakblue (Arhopala atrax) - Mae Jo 01.JPG

    Image 5a. From Mae Ping. Not sure at all about this one. As no dark spot on FW cell upperside, cannot be atrax.
    b5380 Indian Oakblue (Arhopala atrax) - Mae Ping 01.JPG
    Image 5b. Same individual as 5a.
    b5380 Indian Oakblue (Arhopala atrax) - Mae Ping 02.JPG

    Image 6. From Mae Wa. Rather lunulated FW band. Should be A. atrax?
    b5380 Indian Oakblue (Arhopala atrax) - Mae Wa 01.JPG

    Image 7. From Thap Lan (near Khao Yai) southeast Thailand. Not sure.
    b5380 Indian Oakblue (Arhopala atrax) - Thap Lan 01.JPG

  2. #2
    Join Date
    Nov 2010
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    Malaysia
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    Default

    If the individual is not worn you can tell by the presence of the green metallic scales.
    A. atrax tornal metallic green scales present. A. alax green scales absent (perhaps a little).
    Thus .
    2, 3, 6, & 7 with green scales A. atrax.

    1, & 4. without green scales A. alax.

    5 is a bit tricky, but look at the marginal area at the tornus. It is fully green in A. atrax but brown in A. alax.
    Since 5 has the tornal marginal area brown it is likely A. alax.
    A bit more exposure of the upperside would have show whether there is a cellend dark spot.

    TL Seow: Cheers.
    PS. I have check the other post and this single feature (green scales) at the tornal margin , is very consistent.

  3. #3
    Join Date
    Dec 2016
    Location
    Thailand
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    399

    Default

    Many thanks. That helps greatly.

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