Pseudosphinx is a monotypic moth genus in the family Sphingidae first described by Hermann Burmeister in Its only species, Pseudosphinx tetrio , was first described by Carl Linnaeus in Its common names include tetrio sphinx , giant gray sphinx , frangipani hornworm ,  and plumeria caterpillar. It is native to the tropical and subtropical Americas from the southern and southwestern United States to Brazil.
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Few other larvae are as captivating as the caterpillar. The juvenile form of butterflies and moths inhabit the world of charming creepy-crawlies, like ladybugs and fireflies—the kind of insects that are more Lewis Carroll than Franz Kafka. Caterpillars are high in protein and rather defenseless—making them an easy dinner staple for other animals—and many have evolved various means of protection.
A huge nest of caterpillars in Montezuma. These were up to six inches long! Shown here is just a tiny sampling of the species. Please send us photos of others if you have them. One of the amazing things about caterpillars is that many have a particular host plant, or perhaps plants that they will eat.