I'm so glad to finally have a species on these guys. I've since had the pleasure of handraising some and getting to know them.
They are very good crawlers, they can fly just a little bit (a foot or so), they are communal, they can eat a very wide variety of foods (many kinds of plants, fruits, dead insects, etc.), and they're a delight to watch and easy to raise as long as they have an extra large space, as they love to crawl about.
First instars are red (black head/thorax, red abdomen), and second through fifth instars are iridescent black.
Some of their plant favorites: ripe fruit of Turk's Cap; cantaloupe fruit and related as they grow, flower nectar of all kinds (Passiflora, Mexican Flame Vine, salvias, mistflowers, all Asteraceae, and more).
They will also eat what I put out in winter for bees: fondant and gatorade sponges (half clear gatorade, half water).
When I was overwintering some indoors, they did fine on mums, even when the flowers rotted, along with fruit and crushed nuts that I provided.
They are among my hardiest backyard bugs, out in winter on mild days (as adults and later-instar nymphs).
Largus bugs mostly in backyard: https://www.flickr.com/photos/95854225@N02/albums/72157711280415088/page1