Isabella’s Longwing

Eueides isabella eva is correct. I have needed months to separate Ismenius from Isabelle, until I got the point. But it is very easy if the shot is OK. Look at the white spots at the margin of the hindwing: Ismenius has the spots directly AT the margin (as it is normal for Heliconius), whereas Isabella has the spots "IN" the margin. In addition the big black stripe on the hindwing is open in Isabella and closed in Ismenius. The criterias Sarah pointed out are also very helpful.

Thank u Sarah the links work very good but i would like you to check this spotting http://www.projectnoah.org/spottings/714...

Ismael, you are so right that the distinction can be difficult. It is a step-by-step process for me each time when checking between these two. The form of the yellow striping at the end of the upper wing and the black striping on the under part of the back wing are especially helpful. Here are some links with images of the two that should be of more use.
http://neotropicalbutterflies.com/Site%2...
http://eol.org/pages/154228/media
Please let me know if you could not reach either of these links.
Do you have a particular spotting that you would like me to look at?

Sarah what is the diference between Isabella`s lonwing and Tiger longwing butterflies?

You're welcome!

Thanks for the ID Sarah!