Moths of North Carolina
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4 NC Records

Sthenopis argenteomaculatus (Harris, 1842) - Silver-spotted Ghost Moth

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Superfamily: Hepialoidea Family: HepialidaeSubfamily: [Hepialinae]Tribe: [Hepialini]P3 Number: 110016.00 MONA Number: 18.00
Comments: Sthenopis argenteomaculatus is a member of the Ghost Moth, or Swift family, a primitive group of over 500 species that is found worldwide. In North America the family is made up of at least 20 species in four genera, the vast majority having northerly or westerly affinities. S. argenteomaculatus is one of four species currently recognized in the genus, and one of two found in North Carolina.
Field Guide Descriptions: Covell (1984); Beadle and Leckie (2012)Online Photographs: MPG, BugGuide, GBIF, BOLDTechnical Description, Adults: Forbes (1923); Solomon (1995)Technical Description, Immature Stages: Forbes (1923); Solomon (1995)                                                                                 
Adult Markings: This species is among the largest of the primitive moth groups, whose members are almost all much smaller micromoths. The proportionally long forewing is narrow at the base, but widens broadly just past the middle. It then narrows again to a pointed, slightly falcate tip. The forewing is rich brown to bronzy orange, and has a strong, inverse "Y-shaped", ashen gray band. The band is pale-edged and suffused with pink, and runs from the outer third of the costa through the median area to the inner margin. Another grayish band runs obliquely from near the mid-inner margin along the base, and there is a pink-tinged, triangular gray patch about one-third of the way along the costa. Parallel pink lines also run through the terminal area and along the outer margin. There are two white spots (the larger of the two typically triangular in shape) that are located sub-basally, and darker veins stand out on the forewing. The hindwings are light brown to pale gray, and are about the same shape and length as the forewings. The antennae are greatly reduced and simple. In North Carolina this species is differentiated from our only other Sthenopis (S. auratus) by having more of a contrasting forewing pattern, and by the presence of the two white sub-basal spots.
Wingspan: 65-100 mm (Forbes, 1923)
Adult Structural Features: Like others in the genus, the antennae are borne on a proportionally very small head, and are greatly reduced and simple.
Adult ID Requirements: Identifiable from good quality photos of unworn specimens.
Immatures and Development: The eggs incubate for about three weeks before hatching. The larvae bore in alder roots for about two years (possibly three) before the adults emerge. During the end of its second year of development, a larva bores upward into the base of a tree trunk, then to the bark surface where it makes an exit hole. The hole is loosely plugged with wood fragments, and pupation occurs in May in the gallery near the root collar. The adult then emerges through the exit hole (Solomon, 1995). The larvae are cream-colored with a reddish brown head, a dark prothoracic shield, and prominent dorsal pinacula on the abdominal segments. The larvae reach a maximum size of almost 6 cm (Solomon, 1995).
Larvae ID Requirements: Identifiable from good quality photos, especially where associated with known host plants.
Distribution in North Carolina
Distribution: Sthenopis argenteomaculatus is primarily restricted to eastern North America from southern Canada and adjoining areas of the Great Lakes region and the Northeast, southward along the Appalachians to North Carolina. As of 2020, our only records from the state are from three counties in the western mountains. The full distribution in that region is not known.
County Map: Clicking on a county returns the records for the species in that county.
Flight Dates:
 High Mountains (HM) ‚Č• 4,000 ft.
 Low Mountains (LM) < 4,000 ft.
 Piedmont (Pd)
 Coastal Plain (CP)

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