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)
Four-toothed Mason Wasp in St. Mary's Co., Maryland (10/4/2020). (c) jtylerbell, some rights reserved (CC BY-NC). Photo by Tyler Bell. (MBP list)
A Four-toothed Mason Wasp in Anne Arundel Co., Maryland (7/9/2011). Photo by Sue Muller. (MBP list)
A Four-toothed Mason Wasp in Baltimore City, Maryland (10/19/2013). Photo by Pauline Horn. (MBP list)
Four-toothed Mason Wasp in Howard Co., Maryland (9/6/2019). (c) smuller, some rights reserved (CC BY-NC). Photo by Sue Muller. (MBP list)
A Four-toothed Mason Wasp in Montgomery Co., Maryland (7/13/2014). Photo by Max Wilson. (MBP list)
Four-toothed Mason Wasps in Frederick Co., Maryland (7/31/2019). Photo by Katie Woods. (MBP list)
A male Four-toothed Mason Wasp in Baltimore City, Maryland (9/29/2015). Photo by Pauline Horn. (MBP list)
A Four-toothed Mason Wasp found by students at Jemicy School in Baltimore Co., Maryland (7/10/2015). Photo by Emily Stanley. (MBP list)
A Four-toothed Mason Wasp in Baltimore City, Maryland (10/19/2013). Photo by Pauline Horn. (MBP list)
A Four-toothed Mason Wasp in Baltimore City, Maryland (8/2/2014). Determined by Ross Hill/BugGuide. Photo by Vincent Vizachero. (MBP list)