Pyrausta grotei is a moth in the family Crambidae. It was described by Eugene G. Munroe in 1976. It is found in North America, where it has been recorded from Washington, Oregon, Montana, California, Utah, Colorado, Wyoming, Nevada, Arizona and Texas.
The forewings are dark vinous rosy with a brown base. There is a pale yellow spot on the costa. The hindwings are fuscous. Bulletin of the United States Geological and Geographical Survey of the Territories 6 (2): 273 Adults have been recorded on wing from April to August.
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