Well, it appears that our Z. antanossa been lumped as a ssp. of Z. otis.
I found this fresh and robust butterfly at Cumberland in January, our mid-summer. I was not absolutely certain of the identification because of the aberrant underside hind wing disco-cellular spots. Starting at the top: the second spot, the position of which is diagnostic of the species, is entirely missing, and no. 5 is almost invisible.
(Compare this with my earlier posting Z. antanossa.)
Any comment re correct ID would be welcome.
(PS, entomologists count the veins the other way.)