The White Mountain Fritillary (currently treated as a subspecies of
Arctic Fritillary) and the Mount Washington Arctic (currently
treated as a subspecies of Melissa Arctic) are two very specialized
races (possibly distinct species?) of butterflies that are only
found in the high altitudes of the White Mountains of NH. They are
difficult to see, but both can be found by taking the auto road to
the top of Mount Washington. Two of the most important
considerations in trying to find them are to go up there at the
right time of year and TO GO WHEN THE WEATHER IS IDEAL WITH SUN AND
CALM WINDS! The last factor is critical since the weather on Mount
Washington in the middle of summer can be terrible, even when it is
great in Conway.
Jane and I have seen both on separate trips up Mount Washington.
The Arctic we found in the high rocky tundra near the Alpine Garden
trail of Mount Washington on 7/18/15:
https://www.inaturalist.org/observations/126993487
The Fritillary, we found just a bit lower in some patches of asters
in shrubby vegetation along the auto road on 8/15/22:
https://www.inaturalist.org/observations/130916682
The Vermont folks did a good job writing up the life history, timing
and location to find these species:
https://vtecostudies.org/wildlife/invertebrates/butterflies/white-mountain-fritillary/
https://vtecostudies.org/wildlife/invertebrates/butterflies/white-mountain-arctic/
Steve Mirick
Bradford, MA