Nematocampa resistaria

910676.00 — 7010 — Nematocampa resistaria (Herrich-Schäffer, [1856]) — Horned Spanworm Moth
With pupal exuviae and final molt

Larval Host(s)

Presumed main host
on Block Island:

Known hosts:

Polyphagous (woody plants)

Sex Differences

Wing shape moderately sexually dimorphic, with forewing with more falcate tip and hindwing more pointed in female; female with paler ground color. Some individuals seem intermediate in these characters and are difficult to sex.


  • Species Page at Moth Photographers Group
  • Barcode of Life (BOLD) - Caution: Some specimens shown may not be sequenced. DNA barcode provides evidence of relatedness not proof of identification.
  • Ferguson, D. C., 2008. Moths of America North of Mexico, Fascicle 17.2: p. 29; pl. 1.4-7. order or free PDF
  • Hall et al., 2021. The Moths of North Carolina - website (identification, habitats and life history)
  • Hulst, G.D., 1900. New species of Lepidoptera. Journal of the New York Entomological Society, 8(4): 218.
  • Powell, J. A. & P. A. Opler, 2009. Moths of Western North America, Pl. 31.7m; p. 220. Book Review and ordering
  • Species Page at BugGuide
  • Species Page at E. H. Strickland Museum