Since 2004 there have been about 7 reported sightings of this species.
All, so far as I am aware, have been between Oct 1 and Oct 20. The two
at the Brattleboro Retreat Meadows were the 4th Oct and the 20th Oct
(though two years apart). This seems to signify a pretty narrow Fall
migration season and that this is definitely the time to be out there
looking for them.
H
Hector Galbraith PhD
Galbraith Environmental Sciences LLC
837 Camp Arden Rd., Dummerston, VT05301
802 258 4836 (phone)