Here is our October list, updated with input received today. There have been some additions and it is shaping up into a nice list.
We added one species completely new to the derby - Gulf Fritillary, a very rare visitor to Massachusetts. It was reported on the Massachusetts Butterflies Facebook page. There is a photo, so this one is rock solid.
One potentially controversial entry: A "crescent-that looks-more-like-northern-than-pearl" has been reported again. This has happened once before. I am listing it as "Crescent Sp" because I think it will may well prove to be a different species , not yet described, though we may not know in my lifetime. Field marks have proven highly unreliable in the Phyciodes complex [my opinion] and it will take substantial DNA work to unravel its mysteries. I'm not holding my breath.
Meanwhile, our list stands at 34 adults + 3 larvae = 37 species. And it is definitely not too late to add more.
October 2021 Sightings List
[Through October 10]
Massachusetts Butterfly Club
Composite Listing [34 adults +3 subadults = 37 species]
Baltimore Checkerspot [Larva]