Hi Siam. I don't know anything about the butterflies in your area, but I am pretty good at finding information on the net. Here are my guesses. Just guesses based on what I found.

1/2. Blue Transparent Butterfly - Ithomia pellucida
3. Tithorea harmonia furina- Harmonia Clearwing
4/5. Adelpha cytherea insularis - Smooth-banded Sister

Your forest pictures are just lovely. It's so neat to be able to see them. Thanks for sharing. Hope I got some of the ID's right anyway! :o)

You live in a beautiful place, Siam!
The first one is undoubtedly some type of Ithomia, and the last one is undoubtedly one of the sisters/Adelpha.
Here's a link to pictures of two Ithoma butterflies - I. eleonora looks like yours.
Sherry

Here is a link that might be useful: Ithomia

And here's a picture of a sister that looks like yours.
Sherry

Here is a link that might be useful: Adelpha basiloides

Good luck with your determinations folks on the Ithomiinae family from these low resolution pictures. I probably have more experience with this family than all the folks who run this forum regularly combined, and I wouldn't attempt a determination without the bug in hand. There are about 300-400 Neotropical sp/ssp in 3-4 dozen genera of this family, with many dozens that are so close (not even taking into account for species variation) that even the experts in this family often can only give their best guess WITH the bug in hand. So I won't support any of the guesses.

BTW bandjzmom, pellucida is a subspecies of Ithomia agnosia unless it has been reassigned to species level since my work with this group years ago.

The Sister is an Adelpha cytherea ssp IMO.

Fun to have you here Siam as the tropical species were never brought up much until you started posting your pictures. Gives me an excuse to dig into the Neotropical drawers of my synoptic collection.

Larry

Thanks everone for your IDs and Miss Sherry for your helpful links :0
Larry, you know so much about these butterflies its amazing!
Siam.

Wow, gorgeous forests and mountains Siam (not to mention butterflies)! I lived and worked in Barbados for a year, and that little island doesn't look anything like your country.

Great to have you around Larry, to help with such IDs. :)

its is indeed adelpha cytherea ( smooth banded sister. Larry do you know what the host plant of this butterfly is?
Siam.

Siam,

The Adelpha complex as a whole uses a wide variety of larval host plants from many families of plants, so its hard to say what they use there where you are. But I can tell you that the Adelpha cytherea ssp in Costa Rica use Sabicea and Heliocarpus for larval hosts (and probably others).

Larry