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Digital Guide to Moth Identification

91a1416 – 6954   Tetracis jubararia Hulst, 1886
             October Thorn Moth

© Phil Huntley-Franck
Distribution: Caution: A single range map dot for a Canadian province may represent records without specific location data.
British Columbia to southern California, eastward to central Saskatchewan, southwestern Idaho and western Nevada, from ~ 500-7,400 ft. elev..
and Size:
Mid-August - late November. FWL ~ 17-26 mm.
Larva and
Host Plants:
Many known host plants include Alnus, Betula, Cornus, Populus, Ribes, Alder, Picea.
Genitalia: See Ferris & Schmidt (2010).
Similar Species:
  • Separate from T. mosesiana in California coastal counties by genitalia and DNA. Elsewhere the absence of pale shading beyond the pm. line distinguishes this species from T. pallulata.
  • Pinned specimens of related species. (Hint: select View by Region on the related species page.)
Synonymy: Tetracis jubararia Hulst, 1886
Synaxis sericeata Barnes & McDunnough, 1917
Taxonomic Notes: Tetracis jubararia Hulst, 1886, n. comb. in Ferris & Schmidt (2010), was formerly in the genus Synaxis.
  • Barcode of Life (BOLD) - Caution: Some specimens shown may not be sequenced. DNA barcode provides evidence of relatedness not proof of identification.
  • Ferris, C.D. & B.C. Schmidt, 2010. Revision of the North American Genera Tetracis Guenée and Synonymization of Synaxis Hulst with Descriptions of Three New Species (Lepidoptera: Geometridae: Ennominae). Zootaxa, 2347: 1-36.
  • Powell, J. A. & P. A. Opler, 2009. Moths of Western North America, Pl. 30.30f; p. 219. Book Review and ordering
  • Species Page at BugGuide.Net
  • Species Page at E. H. Strickland Museum
Tetracis jubararia
© Dick Wilson
Tetracis jubararia
© John Davis
Tetracis jubararia
© Dick Wilson - DNA
Tetracis jubararia
© Jim Moore
Tetracis jubararia
© Gary Anweiler
Tetracis jubararia
LG – © Jim Troubridge
Tetracis jubararia
LG – © Jim Troubridge
Tetracis jubararia
40mm – © Jim Vargo

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