Here are the pics of the odd white pedestrian butterflies.

Here's the little I know:
-Seen here in Lafayette, Louisiana at least these last 2 years in June.
-They're perched on vines, preferring one broad-leaf variety, but sometimes on another variety, or even an oak sapling.
-They're usually in clusters, lined up one behind the other facing the same direction.
-They seem immobile until you disturb them, at which point they will take a step or two out of the way.
-I've never seen the wings open, never seen one in flight.
-They're there for days at a time, but become more spread out--or perhaps some are eaten, or do fly off.
-I've had a sense that perhaps they are drugged, maybe parasitized. Sometimes their bodies look more translucent, and I'm not sure if I'm seeing their greenish internal organs, or some other living thing coiled up inside.
-Some eventually are found dead on the vine, ash gray and shrunken.
-Sometimes there are ants in the area. Occasionally white, sugary-looking matter on the stem of the vine.

What a mystery, to have wings and never fly-