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Atala (Eumaeus atala florida) is sitting on a leaf in Miami, Florida. It warns the enemy with colors that it is not eatable.
Eumaeus atala florida were beliefed to have been extinct because it was not seen in the years 1937-1959. This species is living only in south of florida and the keys.

The left-side individual, with a Cassius Blue from the LRGV for comparison.

I have a theory about IDing this species from Cassius Blue:

Note the arrangement of dark marks underlined in pink:

For Marine, the dark block in the fourth inter-veinal wedge (the wedge labeled with a green "4") is usually in-line with the outer three blocks; this individual Marine has a slight "uptick" in the 3rd inter-veinal block just before it meets the 4th, but the 4th inter-veinal block is still mostly in-line with the others.

For Cassius, the 4th inter-veinal block is sharply offset basally such that its upper/outer corner touches (or is separated from) the inner/lower corner of the 3rd inter-venial block.

I have been checking this feature for many years, and I feel that it is a very reliable means of distinguishing between the two taxa.