A Large Maple Spanworm in Baltimore Co., Maryland (7/14/2013). Photo by Benjamin DeHaven. (MBP list)

A Large Maple Spanworm Moth in Worcester Co., Maryland (7/19/2013). Photo by Scott Housten. (MBP list)

A Large Maple Spanworm Moth in Howard Co., Maryland (6/17/2013). Photo by Nancy Magnusson. (MBP list)

A Large Maple Spanworm Moth in Frederick Co., Maryland (10/6/2014). Photo by Mark Etheridge. (MBP list)

A Large Maple Spanworm Moth in Garrett Co., Maryland (8/21/2009). Photo by Jim Brighton. (MBP list)

A Large Maple Spanworm Moth in Frederick Co., Maryland (9/27/2016). Verified by Roger Downer/BAMONA. Photo by Mark Etheridge. (MBP list)

A Large Maple Spanworm Moth in Worcester Co., Maryland (6/13/2013). Photo by Scott Housten. (MBP list)

A Large Maple Spanworm in Worcester Co., Maryland (6/13/2013). Photo by Scott Housten. (MBP list)

A Large Maple Spanworm Moth in Howard Co., Maryland (8/29/2017). Verified by Roger Downer/BAMONA. Photo by Bill Harms. (MBP list)

A Large Maple Spanworm Moth in Kent Co., Maryland (9/6/2016). Photo by Mike Hudson. (MBP list)

A Large Maple Spanworm in Somerset Co., Maryland (6/6/2004). Photo by Lance Biechele. (MBP list)

A Large Maple Spanworm Moth in Dorchester Co., Maryland (9/19/2014). Photo by Jonathan Willey. (MBP list)

Large Maple Spanworm Moths in Harford Co., Maryland (7/1/2013). Photo by Mike Burchett. (MBP list)

The large moth in the photo is a Large Maple Spanworm Moth in Kent Co., Maryland (7/5/2014). Photo by Nancy Martin. (MBP list)

A Large Maple Spanworm Moth in Frederick Co., Maryland (8/31/2015). Photo by Mark Etheridge. (MBP list)

A Large Maple Spanworm Moth found by students at Jemicy School in Baltimore Co., Maryland (10/16/2013). Photo by Emily Stanley. (MBP list)

A Large Maple Spanworm Moth in Anne Arundel Co., Maryland (7/6/2016). Photo by Robert Aguilar, SERC. (MBP list)

A Large Maple Spanworm Moth in Anne Arundel Co., Maryland (6/20/2014). Photo by Bill Hubick. (MBP list)

A Large Maple Spanworm Moth in Cecil Co., Maryland (9/20/2014). Photo by Shannon Schade. (MBP list)

A Large Maple Spanworm Moth in Montgomery Co., Maryland (6/29/2013). Photo by Andy Martin. (MBP list)

A Large Maple Spanworm Moth in Prince George's Co., Maryland (6/23/2010). Photo by Bob Patterson. (MBP list)

A Large Maple Spanworm Moth in Prince George's Co., Maryland (3/15/2007). Photo by Bob Patterson. (MBP list)

A Large Maple Spanworm Moth in Calvert Co., Maryland (6/21/2006). Photo by Arlene Ripley. (MBP list)

A Large Maple Spanworm Moth in Howard Co., Maryland (2003). Photo by Larry Line. (MBP list)

A Large Maple Spanworm Moth collected in Frederick Co., Maryland (9/9/2001). Photo by Mark Etheridge. (MBP list)

A Large Maple Spanworm Moth collected by John Glaser in Harford Co., Maryland (9/1/1988). Photo by Larry Line. (MBP list)