Citheronia regalis
（重定向自Regal Moth）
![](/Images/godic/202502/06/Citheronia_regalisPCCA20040718-3494AB3541.jpg")
![An adult regal moth.](/Images/godic/202502/06/Royal_Walnut_Moth-Citheronia_regalis-_TxCounty_Missouri3541.jpg")
![Hickory horned devil, larval stage of the regal moth showing the turquoise phase. Ozarks of Missouri.](/Images/godic/202502/06/Hickory_Horned_Devil_Missouri_Ozarks3541.JPG")
The regal moth (Citheronia regalis), also called the royal walnut moth, is a North American moth in the saturniidae family. The caterpillars are called hickory horned devils. The adult (Imago) has a wingspan of 3.75-6.1 in (9.5-15.5 cm).