Moths of North Carolina

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View PDF	Saturniidae Members:	Citheronia Members:	143 NC Records

Citheronia regalis (Fabricius, 1793) - Regal Moth

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Taxonomy

Superfamily:
Bombycoidea

Family:
Saturniidae

Subfamily:
Caratocaminae

P3 Number:
890009

MONA Number:
7706.00

Other Common Names:
Hickory Horned Devil, Royal Walnut Moth, Regal Walnut Moth

Comments: One of two species in this genus that occurs in North Carolina (a third species, Citheronia splendens, occurs in the US in southern Arizona)

Identification

Field Guide Descriptions: Covell (1984); Beadle and Leckie (2012)

Online Resources: MPG, BugGuide, iNaturalist, Google, BAMONA, GBIF, BOLD

Technical Description, Adults: Forbes (1923), Ferguson (1971), Tuskes et al. (1996)

Technical Description, Immature Stages: Forbes (1923), Ferguson (1971), Covell (1984), Tuskes et al. (1996), Wagner (2005)

Adult Markings: The large gray, red-veined, and yellow spotted adults are unmistakeable.

Wingspan: 110-160 mm (Forbes, 1923); 9.5 - 15.5 cm, females larger than males (Covell, 1984)

Adult ID Requirements: Unmistakable and widely known.

Immatures and Development: The caterpillars, known as Hickory Horned Devils, are also distinctive, due to their large size and three pairs of conspicuous leg-like spines located on their anterior thoracic segments. Larvae of the Pine Devil (Citheronia sepulcralis) are fairly similar, but are typically brown or beige with yellow horns whereas C. regalis larvae are usually green or brown and more strikingly marked; their thoracic and caudal horns are also usually orange to reddish in color and tipped with black (Tuskes et al., 1996).

Distribution in North Carolina

Distribution: Occurs state-wide (Brimley, 1938)

County Map: Clicking on a county returns the records for the species in that county.


Flight Dates: High Mountains (HM) ≥ 4,000 ft. Low Mountains (LM) < 4,000 ft. Piedmont (Pd) Coastal Plain (CP) Click on graph to enlarge
Immature Dates: High Mountains (HM) ≥ 4,000 ft. Low Mountains (LM) < 4,000 ft. Piedmont (Pd) Coastal Plain (CP) Click on graph to enlarge
Flight Comments: Brimley (1938) stated that Citheronia regalis is at least partially two-brooded in North Carolina. However, it appears to be a univoltine, summer-flying species over much of its range (Ferguson, 1971; Tuskes et al., 1996), which appears to be supported by our data.

Habitats and Life History

Habitats: Occurs in a wide variety of forests, ranging from peatland and longleaf pine communities in the Coastal Plain to bottomland and upland hardwoods in the Piedmont and Mountains, including those located above 4,000 ft in elevation. We have no records from the Outer Banks, however, or from other barrier islands.

Larval Host Plants: Larvae are polyphagous on many species of hardwood trees and shrubs. Brimley (1938) lists the following host plants used in North Carolina: cotton (Gossypium), hickories (Carya) including Pecan (C. illinoinensis), Sweetgum (Liquidambar styraciflua), Black Walnut (Juglans nigra), American Persimmon (Diospyros virginiana), Sourwood (Oxydendrum arboreum), and the introduced Princess Tree (Paulownia). Wagner (2005) adds ash (Fraxinus), Butternut (Juglans cinerea), cherry (Prunus), lilac (Syringa), sumac (Rhus), and sycamore (Platanus). We have observed larvae on hickory, Persimmon, Sweetgum, and sumac. - View

Observation Methods: Comes moderately well to 15 watt UV lights and also to incandescent lights, almost always showing up as single individuals (the maximum number we have trapped on a given occasion is two). Adults do not feed and consequently are not attracted by bait or flowers. Larvae can be detected by their large droppings (Wagner, 2005) and when mature become quite conspicuous as they wander over the ground searching for a place to pupate. Pupation occurs underground.

Wikipedia

See also Habitat Account for General Forests and Shrublands

Status in North Carolina

Natural Heritage Program Status:

Natural Heritage Program Ranks: G5 SNR [S5]

State Protection: Has no legal protection, although permits are required to collect it on state parks and other public lands

Comments: Populations are locally vulnerable to the effects of weather, outbreaks of disease, parasites, and predators, and to the effects of pesticides. However, given the commonness of their host plants, wide habitat range and statewide distribution, this species should easily recover from most localized and temporary losses. That may not be true, however, with respect to more pervasive, permanent threats. In the Northeast, populations of this moth have been widely and perhaps permanently extirpated, probably due to parasitism by Compsilura concinnata, a Tachinid fly widely introduced to combat Gypsy Moths and other pest Lepidoptera (Schweitzer et al., 2011; Wagner, 2012). Compsilura has now spread as far south as Virginia (Kellogg et al., 2003) and the situation in North Carolina needs to be monitored.

Photo Gallery for Citheronia regalis - Regal Moth

104 photos are available. Only the most recent 30 are shown.

	Recorded by: Josh Putnam on 2025-07-16 Madison Co. Comment:		Recorded by: Dean Furbish on 2025-07-04 Wake Co. Comment:
	Recorded by: Allison Canter on 2025-07-03 Ashe Co. Comment: Forced perspective at its worst!!		Recorded by: David George, David Cheng, Patrick Coin on 2025-06-29 Richmond Co. Comment:
	Recorded by: David George, David Cheng, Patrick Coin on 2025-06-29 Richmond Co. Comment:		Recorded by: David George, David Cheng, Patrick Coin on 2025-06-29 Richmond Co. Comment:
	Recorded by: Jim Petranka, Mark Basinger and Becky Elkin on 2025-06-29 Richmond Co. Comment:		Recorded by: David Clark on 2025-05-29 Alamance Co. Comment:
	Recorded by: Jeff Niznik, David George on 2024-08-07 Transylvania Co. Comment:		Recorded by: Jeff Niznik, David George on 2024-08-07 Transylvania Co. Comment:
	Recorded by: David George, Jeff Niznik on 2024-08-05 Transylvania Co. Comment:		Recorded by: David George, Jeff Niznik on 2024-08-05 Transylvania Co. Comment:
	Recorded by: Alex on 2024-07-16 Burke Co. Comment:		Recorded by: Owen McConnell on 2024-07-14 Graham Co. Comment:
	Recorded by: Owen McConnell on 2024-07-13 Graham Co. Comment:		Recorded by: Elizabeth Tingley on 2024-07-09 Buncombe Co. Comment:
	Recorded by: Elizabeth Tingley on 2024-07-09 Buncombe Co. Comment:		Recorded by: Elizabeth Tingley on 2024-07-09 Buncombe Co. Comment:
	Recorded by: Marie Leonard on 2024-07-09 Guilford Co. Comment:		Recorded by: Marie Leonard on 2024-07-09 Guilford Co. Comment:
	Recorded by: Jim Petranka on 2024-07-07 Madison Co. Comment:		Recorded by: R. Spainhour on 2024-07-07 Surry Co. Comment:
	Recorded by: ashley holden on 2024-06-06 Avery Co. Comment:		Recorded by: David George, Rich Teper on 2024-05-13 Chatham Co. Comment:
	Recorded by: David George, Rich Teper on 2024-05-13 Chatham Co. Comment:		Recorded by: David George on 2023-09-03 Durham Co. Comment:
	Recorded by: David George on 2023-09-03 Durham Co. Comment: feeding on persimmon.		Recorded by: H. Talcott on 2023-08-16 Moore Co. Comment:
	Recorded by: David George, Stephen Dunn, Jeff Niznik on 2023-07-31 Swain Co. Comment:		Recorded by: Emily Stanley on 2023-07-19 Yancey Co. Comment: