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Digital Guide to Moth Identification

91a1419 – 6958   Tetracis formosa (Hulst, 1896)

© Libby & Rick Avis
Distribution: Southern British Columbia south to California, eastward to southern Alberta, Idaho, Utah, Wyoming and Colorado. From ~ 2,850 - 7,600 ft. elev. Desert riparian canyons to dry coniferous forest.
and Size:
Early September - late November. FWL ~ 17-23 mm.
Genitalia: See Ferris & Schmidt (2010).
Similar Species:
  • Pinned specimens of related species. (Hint: select View by Region on the related species page.)
Synonymy: Gonodontis formosa Hulst, 1896
Taxonomic Notes: Tetracis formosa (Hulst, 1896), n. comb. in Ferris & Schmidt (2010), was formerly in the genus Synaxis.
  • 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. 30.31m; p. 219. Book Review and ordering
  • Species Page at BugGuide.Net
  • Species Page at E. H. Strickland Museum
Tetracis formosa
– © Cliff Ferris
Tetracis formosa
– © Cliff Ferris
Tetracis formosa
– © Cliff Ferris
Tetracis formosa
LG – © Jim Troubridge
Tetracis formosa
40mm – © Jim Vargo
Tetracis formosa
40mm - LG – © Jim Vargo

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