American Snouts host on various species of Hackberry (Celtis), but Spiny Hackberry (Celtis pallida) provides the fuel for the tremendous periodic population explosions across the arid southwestern United States. Spiny hackberry is one of the more common shrubs of the Tamaulipan thornscrub (or South Texas Brush Country). Other common names for this spiny hackberry include Granjeno and Desert Hackberry. Note that while other species of Celtis can host snout caterpillars, the non pallida species don't put on new leaves (which the just hatched caterpillars require) in response to significant summer rain events.
-- Mike Quinn  Texas Entomology 

Snout butterflies have prominent elongated mouthparts (labial palpi) which give the appearance of the petiole (stem) of a dead leaf. Wings are patterned on black-brown with white and orange markings. The fore wings have a distinctive squared off, hook-like (falcate) tip. Caterpillars appear humpbacked, having a small head, swollen first and second abdominal segments, and a last abdominal segment that is tapered and rounded. They are dark green with yellow stripes along the top and sides of the body, and have two black tubercles on the top of the thorax.

Brushfoot Butterflies seem to have only four legs, as the front pair (of six total) are almost alway held close to the body.
I have noticed a few Hymenoptera doing the same thing, most notably these male brownbelted bumble bees.
 

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