Yesterday (October 3rd), Chris Adam got two new late records for the Maritimes in Oromocto. He had Eastern Tailed-Blue, which prior to this year had only been seen as late as September 4, and Common Ringlet, which prior to this year had only been seen as late as September 28.
Given the good weather forecast for this weekend, new record late dates are possible for a number of species:
Least Skipper – current late date September 22. Look for it in wet ditches.
Great Spangled Fritillary – current late date September 27. Look for this in open areas, like old fields and roadsides.
Northern Spring Azure – current late date October 4. This species could show up just about anywhere.
Northern Crescent – current late date October 2. Look for this species in old fields and roadsides.
Silver-bordered Fritillary – current late date September 26. Look for this species along woods roads and other open areas.
Atlantis Fritillary – current late date October 5. Look for this in open areas, like old fields and roadsides.
The species listed above don’t overwinter as adults, so what you’ll find are very shabby-looking individuals. Of the species we have that do overwinter as adults (commas, tortoiseshells, Mourning Cloak), there are a couple that have never been recorded this late. Grey Comma hasn’t been recorded later than September 22, and Hoary Comma hasn’t been recorded later than September 9. Both you’ll find along woods roads. Grey Comma could be found anywhere in the Maritimes, whereas Hoary Comma is unlikely to be seen outside of northern New Brunswick.
A few other species have late dates coming up that could be beat if the weather stays warm:
Black Swallowtail – current late date October 8. Could show up at open sites just about anywhere, but most frequent around human habitation.
Mustard White – current late date October 7. Look for it in rural yards with woods nearby and along woods roads.
Harvester – current late date October 6. Look for it around alder swales.
Bronze Copper – current late date October 7. A wetland species that is fairly restricted. A good bet are the trails along the Peticodiac River in and around Moncton.
Flight dates for all species can be found here, and information on each species biology can be found by clicking on the species names on that page.
Finding some of these species might seem like a long shot given how low the numbers were for many even in the prime of their flight periods, but you never know what you’ll find if you don’t get out and take a look!