Synonyms and other taxonomic changes
Digrammia irrorata (Packard, 1876)
Phasiane irrorata Packard, 1876
Semiothisa irrorata var. venosata McDunnough, 1939
Phylogenetic sequence # 189775
Adult: forewing color varies from light tan to yellowish to medium brown with straight, pale yellowish AM and PM lines; AM line stops just short of costa, and both lines may be indistinct in paler individuals; discal spot dark brown, conspicuous; veins in outer half of wing finely lined with pale yellow scales; males in particular usually have a series of poorly-defined dark spots or blotches in median area and across wing beyond PM line. Hindwing similarly colored but with no AM line, and smaller, less distinct discal spot (adapted from description at U. of Alberta).
Western United States and southwestern Canada. (1)
Shrubby areas along river valleys, arid grasslands; adults are nocturnal and attracted to light (E.H. Strickland Museum).
Adults fly from March to June in northern regions. Several broods in the south.
, the yellow PM line is usually lined with reddish-brown inner border and a blackish outer border. (3)
Ferguson, D. C. 2008. Moths of America North of Mexico. Fascicle 17.2, p.315, pl.8.8-12 (3)
Packard, A. S. 1876. Monograph of the geometrid moths or Phalaenidae of the United States. USGS Surv. Territ. 10: 273
, pl. 10
, f. 7
distribution in Canada
showing BC only, but also occurs in Alberta (CBIF)
pinned adult images
of three specimens showing range of color and pattern (CBIF)