You need to be very careful with Mycalesis species as they have wet and dry season forms.
If you got M. francisca from my site, please disregard. This is a throwback from my old site and needs to be deleted (also M. distanti). The Mycalesis are the last Genus I need to get confirmed, but will not start that until I have finished the individual pages for the Hesperiidae.
Both species you mention are purely Northern Thai species, and have not been recorded from the Peninsular.
Nevertheless, reduced size of spotting is usually for the dry season forms, and we are still in the wet season here, so it is a bit odd.
I agree, it does look a good fit. Full name Mycalesis suaveolens duguidi (Wood Mason's Bush Brown).
However, this is another northern species, not previously found on the peninsular. Neverthess, Samui and KP seem to have a tendancy of having species not meant to be there!
I was looking at some Australian butterflies when I saw that M. perseus is found there and voila ! there is a dry season form which looks very similar to this.
A search brings up this dry season form of M. perseus from India.
The wing perspective is distorted and the colour rendition is too dull. http://www.flickr.com/photos/satyend...57623002604607
The key feature is the sub-basal dark line which is very irregular and matches your pic.
The dark line in M. suaveolens is too smooth, & moreover it is very unlikely to have stray into KPN from far north.
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Mycalesis
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