A Four-toothed Mason Wasp in Anne Arundel Co., Maryland (6/15/2017). Determined by John S. Ascher/BugGuide. Photo by Jane Chandler. (MBP list)
A Four-toothed Mason Wasp in Howard Co., Maryland (9/17/2012). Photo by Nancy Magnusson. (MBP list)
Four-toothed Mason Wasp in Prince George's Co., Maryland (8/3/2019). (c) Sergei Drovetski, all rights reserved. Photo by Sergei Drovetski. (MBP list)
A Four-toothed Mason Wasp in Baltimore City, Maryland (7/30/2006). Determined by Edward Trammel/BugGuide. Photo by Thomas Wilson. (MBP list)
A Four-toothed Mason Wasp in Howard Co., Maryland (7/30/2016). Determined by Brandon Woo/BugGuide. Photo by Kurt Schwarz. (MBP list)
Four-toothed Mason Wasp in Prince George's Co., Maryland (8/3/2019). (c) Sergei Drovetski, all rights reserved. Photo by Sergei Drovetski. (MBP list)
Four-toothed Mason Wasp in Anne Arundel Co., Maryland (8/23/2020). (c) Timothy Reichard, all rights reserved. Photo by Timothy Reichard. (MBP list)
A Four-toothed Mason Wasp in Washington Co., Maryland (7/21/2019). Photo by Mark Etheridge. (MBP list)
A Four-toothed Mason Wasp in Montgomery Co., Maryland (6/15/2014). Photo by Max Wilson. (MBP list)
A Four-toothed Mason Wasp in Baltimore Co., Maryland (8/8/2014). Photo by Brandon Woo. (MBP list)
A Four-toothed Mason Wasp in Prince Georges Co., Maryland (9/16/2014). Photo by George Harley. (MBP list)
Four-toothed Mason Wasp in Anne Arundel Co., Maryland (6/17/2020). (c) Matthew Beziat, some rights reserved (CC BY-NC). Photo by Matthew Beziat. (MBP list)
A Four-toothed Mason Wasp in Montgomery Co., Maryland (6/24/2017). Determined by Ken Wolgemuth/BugGuide. Photo by Dave Kidwell. (MBP list)
A Four-toothed Mason Wasp in Worcester Co., Maryland (7/18/2014). Determined by Kyhl Austin/BugGuide. Photo by Scott Housten. (MBP list)
Four-toothed Mason Wasp in Prince George's Co., Maryland (8/25/2019). (c) jrcagle, some rights reserved (CC BY-NC). Photo by jrcagle via iNaturalist. (MBP list)
A Four-toothed Mason Wasp in Anne Arundel Co., Maryland (9/30/2014). Determined by Ken Wolgemuth/BugGuide. Photo by Lynn Strauss. (MBP list)
A Four-toothed Mason Wasp in Washington Co., Maryland (6/20/2015). Photo by Mark Etheridge. (MBP list)