Download hornworm moths7/3/2023 All forms have a stiff "horn" near the end of the abdomen that is straight, and black and longer than those of other hornworm species. A light form is pale yellow with markings and patches of black on top, and some are intermediately marked. Some larvae are black on top and pale yellow underneath. Older catalpa worms may be strikingly different. Young caterpillars are mostly white with black spots. Very young worms are tiny and pale, but already have noticeable horns. Eggs are very small, pale, and yellowish. Eggs are laid in masses of 100 to 1,000 on the undersides of leaves, on twigs, and on branches. The hind wings are almost uniformly brownish gray. ![]() ![]() The wings and body are gray with irregular dark and light bands and markings. ![]() The catalpa sphinx moth has a heavy body and a wingspread of about three inches. The catalpa worm or catawba worm, Ceratomia catalpae, is more formally known as the catalpa sphinx. Description and Biology Skip to Description and Biology
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