I was just introduced to your great site by my son: until now he has been my resource for these things, based on one course back in high school. I have been getting into macrophotography over the past year, and have become amazed at the diversity of insects and spiders the right here in suburban Boston area. At my son’s suggestion, I have started using a blacklight to bring out more in the evening. This fellow had a body length of 1.5 to 2 inches (4-5 cm), was a weak flyer, just sort of fluttering around. … Thanks for any help!
This is a Fishfly. Fishflies from the genus Chauliodes can be distinguised from their close relatives, the Dobsonflies, because Fishflies have feathered antennae. BugGuide has much information on Fishflies.