The Mormon Metalmark has one generation in BC. Adults are seen from mid-August to late September. Further south in the species' range, it overwinters as a larva, feeding whenever the temperature is above 13°C (Ballmer and Pratt 1989). Since such temperatures are rarely reached in the Keremeos area in winter, it must hibernate, either as an egg or as an early instar larva. The populations in the Keremeos area are found on Eriogonum niveum (CSG; JHS). In 1989, adults at the population near Keremeos were at peak abundance from 11 to 20 August, and adults were observed until 1 October 1989 (Huber Moore, pers. comm.).
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