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Species Scythris trivinctella - Banded Scythris - Hodges#1678

Scythris trivinctella (Zeller) - Scythris trivinctella Moth - Scythris trivinctella Banded Sythris, Sythris trivinctella, Hodges 1678? - Scythris trivinctella Scythris trivinctella Scythris trivinctella - male Scythris trivinctella (Banded Scythris) - Scythris trivinctella Banded Scythris - Scythris trivinctella small moths - Scythris trivinctella - male - female
Show images of: caterpillars · adults · both
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Lepidoptera (Butterflies and Moths)
Superfamily Gelechioidea (Twirler Moths and kin)
Family Scythrididae (Flower Moths)
Genus Scythris
Species trivinctella (Banded Scythris - Hodges#1678)
Hodges Number
1678
Synonyms and other taxonomic changes
Scythris trivinctella (Zeller, 1873)
Butalis trivinctella Zeller, 1873
* phylogenetic sequence #421713
Size
Wingspan about 12 mm
Identification
Adult - forewing dark brownish-gray with broad white diagonal AM line and oblique PM line that divides into a Y shape at inner margin; AM line may merge with pale basal line; hindwing slender, lancelike, uniformly dark with very broad fringe of hairlike scales.
According to Landry 1991, if a scythridid has the basal white marking on the forewing, followed by the curved white marking, followed by the white transverse bar (the latter with or without the little brown nick at the posterior margin), then it can be reliably diagnosed as S. trivinctella (which occurs across most of the USA and southern Canada), unless it occurs in California or Nevada, where the similar S. ypsilon (CA only) and a couple of similar/related, undescribed "species to be named later" occur. Furthermore, S. trivinctella can be quite variable in appearance. As one extreme end of its possible variation, Landry 1991 illustrates an individual (determined by dissection, I assume) that was collected in Illinois, that has no white markings on the forewing at all. Therefore, the moths in Mike's two photos, even though they are a bit different in appearance, certainly fall comfortably enough within the range of variation of S. trivinctella to be diagnosed as that species (Terry Harrison, 25 December, 2008) (1)
Range
e. US to AZ - Map - New England to Florida, the Great Plains states, Texas to Arizona and south into Mexico, Utah, eastern Oregon and southern British Columbia. (2)
Habitat
Diurnal, often seen at flowers, but will come to lights. (2)
Food
Larvae feed on slim amaranth (Amaranthus hybridus, Amaranthaceae).
Remarks
parasitized by the tachinid fly Nemorilla pyste.
See Also
Other common Scythris species lack pale bands on forewing.
Moth Photographers Group - photos of related species
Print References
Powell, J.A. & P.A. Opler 2009. Moths of Western North America. University of California Press. p.79, Pl.6.43m (2)
Crevecoeur, F.F. 1921. Additions to the list of Kansas Lepidoptera. Transactions of the Kansas Academy of Science 30: 377-385. (3)
Internet References
presence in British Columbia; list (U. of British Columbia)
Works Cited
1.Systematics of the nearctic Scythrididae (Lepidoptera: Gelechioidea)...
Landry, J.-F. 1991. Memoirs of the entomological Society of Canada. 160: 1-341.
2.Moths of Western North America
Powell and Opler. 2009. UC Press.
3.Additions to the list of Kansas Lepidoptera.
Crevecoeur, F.F. 1921. Transactions of the Kansas Academy of Science 30: 377-385.