I have collected many Specimens of Speyeria that look like they have both Silvered and Unsilvered individuals. The Genitalia are extremely close.
Norbert Kondla photographs are extremely helpful. However,
Early last week I mounted 30+ specimens of Speyeria atlantis from South Central South Dakota. Just from my quick look while pinning them, I know they are Speyeria Atlantis. The subspecies remains to be determined.
I have jjust added two(2) additional drawers for Speyeria atlantis from the south west corner of Colorado and central Montana. The Genitalia are very close.
And no offence to any photographer, IDing Speyeria with photographs has never worked for me.
On Wed, Nov 16, 2022 at 5:00 PM, Norbert Kondla
In my experience, S. hesperis with unsilvered ventral hindwings are rare in Canada.
I remember only collecting 2 such specimens; one in prairie Alberta and one in
Purcell Mtns of British Columbia. Here are mug shots: https://flic.kr/p/2nZDrFc
Calgary, Alberta, Canada (elevation 1060 metres asl)