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Species Digrammia sexpunctata - Six-spotted Digrammia - Hodges#6387.1

Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Lepidoptera (Butterflies and Moths)
Superfamily Geometroidea (Geometrid and Swallowtail Moths)
Family Geometridae (Geometrid Moths)
Subfamily Ennominae
Tribe Macariini
Genus Digrammia
Species sexpunctata (Six-spotted Digrammia - Hodges#6387.1)
Hodges Number
6387.1
Identification
Forewings mostly plain gray with black marks on the costa at the locations of the AM, median, and PM lines. The PM line is often bold, black, and continuous about half-way down the FW, typically with at least an additional black smudge outside the PM line across from the FW cell.
Range
Known mainly from the Great Basin ranges.(1) Ferguson examined specimens from Colorado, Idaho, Nevada, Oregon, Utah, and Washington. An MPG record mapped in central Texas was based on a misidentification.
Habitat
In mountainous areas, the species occurs at middle elevations (7,000 - 8,000 ft).(1)
Season
Flight period May to early August with peak in early to mid-July.(1)
Food
The species has been reared from larvae on Purshia tridentata (Antelope bitterbrush).
Remarks
Ferguson(1) states that the species is so close to Digrammia ubiquitata that some specimens may needed genitalic examination to be separated. They occur over much of the same Great Basin range. The bold PM black line may be less continuous across the FW in ubiquitata (suggested in MPG images).
Internet References
Works Cited
1.The Moths of America North of Mexico, Fascicle 17.2, Geometroidea, Geometridae, Ennominae.
Douglas C. Ferguson . 2008. The Wedge Entomological Research Foundation.