Two-striped Walking Sick

Anisomorpha buprestoides is a large, stout (for a stick insect) brown phasmid with three conspicuous longitudinal black stripes. Females average 67.7 mm in length; males are smaller and more slender, averaging 41.7 mm (Littig 1942). There is a strikingly distinct black and white color form that is found only in the Ocala National Forest scrub (Hetrick 1949a), the taxonomic status of which should be investigated. Both forms suffer considerable discoloration upon death and pinned specimens are not nearly as distinctively marked as living individuals. A second species, Anisomorpha ferruginea (Palisot de Beauvois), occurs in the southeastern U.S., but apparently does not occur in Florida. It is distinguished by its smaller size, paler color and lack of conspicuous striping. There are no specimens of this species in the Florida State Collection of Arthropods. Both species are commonly found with the small males riding atop the larger females.
http://entnemdept.ufl.edu/creatures/misc/walkingstick.htm