My impression in the field was E. propertius over persius. Large.
Laying egg on clover at roadside.
Associated set of observations:
Adult: https://www.inaturalist.org/observations/215627947 (this observation)
Egg: https://www.inaturalist.org/observations/215627961
Plant: https://www.inaturalist.org/observations/215627969
Same location as earlier in the morning, but a different individual (the black markings around the glassy white spots are different).
I always find it fascinating how a location like this at a puddle can have a bunch of blues and just one Duskywing in the morning, and then exactly the same selection of butterflies later in the day, but the one Duskywing isn't the same one.
On Camas leaves
On cow parsnip.
Photo by B. Verbeek
In our yard. Slightly worn, large Fritillary. Lightly patterned dorsal marginal band. On VHW, small, widely spaced silver spotting, unlike smaller Hydaspe, Zerene or other frits which have thicker more closely patterned spotting. Also, thick, cleanly delineated band of ground color between VHW margin and basal area.
Hydaspes are quite common in our area. Possible Zerene, but I've never seen a Zerene in our region with this amount of wine-coloring on the ventral HW, and Zerenes have more beige ground color on the ventral side. Here's a link to a Zerene I photographed in the Pend Oreille area.https://www.inaturalist.org/observations/14415057