Four-toothed Mason Wasp in Prince George's Co., Maryland (8/3/2019). (c) Sergei Drovetski, all rights reserved. (Photo ID: 263713 - Psn: 10)

View Record Details Photo by Sergei Drovetski MBP List

Four-toothed Mason Wasp in Prince George's Co., Maryland (8/3/2019). (c) Sergei Drovetski, all rights reserved. (Photo ID: 263711 - Psn: 11)

View Record Details Photo by Sergei Drovetski MBP List

A Four-toothed Mason Wasp in Frederick Co., Maryland (9/9/2017).

View Record Details Photo by Mark Etheridge MBP List

A Four-toothed Mason Wasp in St. Mary's Co., Maryland (5/31/2015).

View Record Details Photo by Steve Scholnick MBP List

A Four-toothed Mason Wasp in Wicomico Co., Maryland (6/15/2014).

Photo by Jim Brighton MBP List

Four-toothed Mason Wasps in Wicomico Co., Maryland (6/11/2016).

View Record Details Photo by Jim Brighton MBP List

Four-toothed Mason Wasps in Calvert Co., Maryland (5/25/2006).

Photo by Arlene Ripley MBP List

Four-toothed Mason Wasp in Carroll Co., Maryland (6/1/2022).

View Record Details Photo by Barbara Speckart MBP List

Four-toothed Mason Wasp in Baltimore Co., Maryland (6/24/2021). (c) Frode Jacobsen, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 493892 - Psn: 35)

Four-toothed Mason Wasp in Baltimore Co., Maryland (6/24/2021). (c) Frode Jacobsen, some rights reserved (CC BY-NC).

View Record Details Photo by Frode Jacobsen MBP List

Four-toothed Mason Wasp in Montgomery Co., Maryland (8/16/2022). (c) Katja Schulz, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by/4.0/'>CC BY</a>). (Photo ID: 659904 - Psn: 35)

Four-toothed Mason Wasp in Montgomery Co., Maryland (8/16/2022). (c) Katja Schulz, some rights reserved (CC BY).

View Record Details Photo by Katja Schulz via iNaturalist MBP List

A Four-toothed Mason Wasp in Howard Co., Maryland (9/17/2012).

Photo by Nancy Magnusson MBP List

A Four-toothed Mason Wasp in Anne Arundel Co., Maryland (6/15/2017). Determined by John S. Ascher/BugGuide.

View Record Details Photo by Jane Chandler MBP List

A Four-toothed Mason Wasp in Baltimore City, Maryland (7/30/2006). Determined by Edward Trammel/BugGuide.

View Record Details Photo by Thomas Wilson MBP List

A Four-toothed Mason Wasp in Howard Co., Maryland (7/30/2016). Determined by Brandon Woo/BugGuide.

View Record Details 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 ID: 263712 - Psn: 41)

View Record Details Photo by Sergei Drovetski MBP List

A Four-toothed Mason Wasp in Washington Co., Maryland (7/21/2019).

View Record Details Photo by Mark Etheridge MBP List

Four-toothed Mason Wasp in Anne Arundel Co., Maryland (8/23/2020). (c) Timothy Reichard, all rights reserved. (Photo ID: 225458 - Psn: 42)

View Record Details Photo by Timothy Reichard MBP List

Four-toothed Mason Wasp in Cecil Co., Maryland (7/28/2023). (c) Amaal Yazdi, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 857620 - Psn: 44)

Four-toothed Mason Wasp in Cecil Co., Maryland (7/28/2023). (c) Amaal Yazdi, some rights reserved (CC BY-NC).

View Record Details Photo by ayazd via iNaturalist MBP List

A Four-toothed Mason Wasp in Montgomery Co., Maryland (6/15/2014).

View Record Details 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 (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 236187 - Psn: 54)

Four-toothed Mason Wasp in Anne Arundel Co., Maryland (6/17/2020). (c) Matthew Beziat, some rights reserved (CC BY-NC).

View Record Details Photo by Matthew Beziat MBP List

A Four-toothed Mason Wasp in Montgomery Co., Maryland (6/24/2017). Determined by Ken Wolgemuth/BugGuide.

View Record Details Photo by Dave Kidwell MBP List

A Four-toothed Mason Wasp in Worcester Co., Maryland (7/18/2014). Determined by Kyhl Austin/BugGuide.

View Record Details Photo by Scott Housten MBP List

Four-toothed Mason Wasp in Baltimore City, Maryland (7/5/2019). (c) Nathaniel Schwartz, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc-nd/4.0/'>CC BY-NC-ND</a>). (Photo ID: 262107 - Psn: 55)

Four-toothed Mason Wasp in Baltimore City, Maryland (7/5/2019). (c) Nathaniel Schwartz, some rights reserved (CC BY-NC-ND).

View Record Details Photo by Nathaniel Schwartz via iNaturalist MBP List

Four-toothed Mason Wasp in Anne Arundel Co., Maryland (7/3/2021). (c) Timothy Reichard, all rights reserved. (Photo ID: 434674 - Psn: 56)

View Record Details Photo by Timothy Reichard MBP List

A Four-toothed Mason Wasp in Anne Arundel Co., Maryland (7/22/2014).

Photo by Marshall Iliff MBP List

A Four-toothed Mason Wasp in Washington Co., Maryland (6/20/2015).

View Record Details Photo by Mark Etheridge MBP List

A Four-toothed Mason Wasp in Anne Arundel Co., Maryland (9/30/2014). Determined by Ken Wolgemuth/BugGuide.

View Record Details Photo by Lynn Strauss MBP List

Four-toothed Mason Wasp in Prince George's Co., Maryland (8/25/2019). (c) jrcagle, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 198725 - Psn: 65)

Four-toothed Mason Wasp in Prince George's Co., Maryland (8/25/2019). (c) jrcagle, some rights reserved (CC BY-NC).

View Record Details Photo by jrcagle via iNaturalist MBP List

Four-toothed Mason Wasp in St. Mary's Co., Maryland (10/4/2020). (c) jtylerbell, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 296400 - Psn: 66)

Four-toothed Mason Wasp in St. Mary's Co., Maryland (10/4/2020). (c) jtylerbell, some rights reserved (CC BY-NC).

View Record Details Photo by Tyler Bell MBP List

Four-toothed Mason Wasp in Baltimore Co., Maryland (8/1/2020). (c) Frode Jacobsen, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 361891 - Psn: 66)

Four-toothed Mason Wasp in Baltimore Co., Maryland (8/1/2020). (c) Frode Jacobsen, some rights reserved (CC BY-NC).

View Record Details Photo by Frode Jacobsen MBP List

A Four-toothed Mason Wasp in Anne Arundel Co., Maryland (7/9/2011).

View Record Details Photo by Sue Muller MBP List

A Four-toothed Mason Wasp in Baltimore City, Maryland (10/19/2013).

View Record Details Photo by Pauline Horn MBP List

Four-toothed Mason Wasp in Howard Co., Maryland (9/6/2019). (c) smuller, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 198727 - Psn: 76)

Four-toothed Mason Wasp in Howard Co., Maryland (9/6/2019). (c) smuller, some rights reserved (CC BY-NC).

View Record Details 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).

View Record Details Photo by Katie Woods MBP List

A male Four-toothed Mason Wasp in Baltimore City, Maryland (9/29/2015).

View Record Details Photo by Pauline Horn MBP List

A Four-toothed Mason Wasp found by students at Jemicy School in Baltimore Co., Maryland (7/10/2015).

View Record Details Photo by Emily Stanley MBP List

A Four-toothed Mason Wasp in Baltimore City, Maryland (10/19/2013).

View Record Details Photo by Pauline Horn MBP List

A Four-toothed Mason Wasp in Baltimore City, Maryland (8/2/2014). Determined by Ross Hill/BugGuide.

View Record Details Photo by Vincent Vizachero MBP List

Four-toothed Mason Wasp in Montgomery Co., Maryland (9/4/2020). (c) Izabella Farr, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 305763 - Psn: 164)

Four-toothed Mason Wasp in Montgomery Co., Maryland (9/4/2020). (c) Izabella Farr, some rights reserved (CC BY-NC).

View Record Details Photo by Izabella Farr via iNaturalist MBP List

Four-toothed Mason Wasp in Montgomery Co., Maryland (9/4/2020). (c) Izabella Farr, some rights reserved (CC BY-NC).

View Record Details Photo by Izabella Farr via iNaturalist MBP List

Four-toothed Mason Wasp in Washington Co., Maryland (7/17/2025). No rights reserved.

View Record Details Photo by Ian via iNaturalist MBP List

Four-toothed Mason Wasp in Montgomery Co., Maryland (8/27/2025). (c) Hugh A. Rand, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 1339251 - Psn: 200)

Four-toothed Mason Wasp in Montgomery Co., Maryland (8/27/2025). (c) Hugh A. Rand, some rights reserved (CC BY-NC).

View Record Details Photo by hughrand via iNaturalist MBP List

Four-toothed Mason Wasp in Prince George's Co., Maryland (10/18/2025). (c) Sue Muller, some rights reserved (CC BY-NC)

View Record Details Photo by Sue Muller MBP List

Four-toothed Mason Wasp in Harford Co., Maryland (6/6/2026). (c) Nick Spigler, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>) (Photo ID: 1520538 - Psn: 200)

Four-toothed Mason Wasp in Harford Co., Maryland (6/6/2026). (c) Nick Spigler, some rights reserved (CC BY-NC)

View Record Details Photo by birdsandbugs21 via iNaturalist MBP List

Four-toothed Mason Wasp in Harford Co., Maryland (6/6/2026). (c) Nick Spigler, some rights reserved (CC BY-NC)

View Record Details Photo by birdsandbugs21 via iNaturalist MBP List

A Four-toothed Mason Wasp in Calvert Co., Maryland (8/31/2016).

View Record Details Photo by Mary B. Hollinger MBP List

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460 Records

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Use of media featured on Maryland Biodiversity Project is only permitted with express permission of the photographer.

A Four-toothed Mason Wasp in Frederick Co., Maryland (9/9/2017). View Record Details Media by Mark Etheridge.

A Four-toothed Mason Wasp in St. Mary's Co., Maryland (5/31/2015). View Record Details Media by Steve Scholnick.

A Four-toothed Mason Wasp in Wicomico Co., Maryland (6/15/2014). Media by Jim Brighton.

Four-toothed Mason Wasps in Wicomico Co., Maryland (6/11/2016). View Record Details Media by Jim Brighton.

Four-toothed Mason Wasps in Calvert Co., Maryland (5/25/2006). Media by Arlene Ripley.

Four-toothed Mason Wasp in Carroll Co., Maryland (6/1/2022). View Record Details Media by Barbara Speckart.

Four-toothed Mason Wasp in Baltimore Co., Maryland (6/24/2021). (c) Frode Jacobsen, some rights reserved (CC BY-NC). View Record Details Media by Frode Jacobsen.

Four-toothed Mason Wasp in Montgomery Co., Maryland (8/16/2022). (c) Katja Schulz, some rights reserved (CC BY). View Record Details Media by Katja Schulz via iNaturalist.

A Four-toothed Mason Wasp in Howard Co., Maryland (9/17/2012). Media by Nancy Magnusson.

A Four-toothed Mason Wasp in Anne Arundel Co., Maryland (6/15/2017). Determined by John S. Ascher/BugGuide. View Record Details Media by Jane Chandler.

A Four-toothed Mason Wasp in Baltimore City, Maryland (7/30/2006). Determined by Edward Trammel/BugGuide. View Record Details Media by Thomas Wilson.

A Four-toothed Mason Wasp in Howard Co., Maryland (7/30/2016). Determined by Brandon Woo/BugGuide. View Record Details Media by Kurt Schwarz.

A Four-toothed Mason Wasp in Washington Co., Maryland (7/21/2019). View Record Details Media by Mark Etheridge.

Four-toothed Mason Wasp in Cecil Co., Maryland (7/28/2023). (c) Amaal Yazdi, some rights reserved (CC BY-NC). View Record Details Media by ayazd via iNaturalist.

A Four-toothed Mason Wasp in Montgomery Co., Maryland (6/15/2014). View Record Details Media by Max Wilson.

A Four-toothed Mason Wasp in Baltimore Co., Maryland (8/8/2014). Media by Brandon Woo.

A Four-toothed Mason Wasp in Prince Georges Co., Maryland (9/16/2014). Media by George Harley.

Four-toothed Mason Wasp in Anne Arundel Co., Maryland (6/17/2020). (c) Matthew Beziat, some rights reserved (CC BY-NC). View Record Details Media by Matthew Beziat.

A Four-toothed Mason Wasp in Montgomery Co., Maryland (6/24/2017). Determined by Ken Wolgemuth/BugGuide. View Record Details Media by Dave Kidwell.

A Four-toothed Mason Wasp in Worcester Co., Maryland (7/18/2014). Determined by Kyhl Austin/BugGuide. View Record Details Media by Scott Housten.

Four-toothed Mason Wasp in Baltimore City, Maryland (7/5/2019). (c) Nathaniel Schwartz, some rights reserved (CC BY-NC-ND). View Record Details Media by Nathaniel Schwartz via iNaturalist.

A Four-toothed Mason Wasp in Anne Arundel Co., Maryland (7/22/2014). Media by Marshall Iliff.

A Four-toothed Mason Wasp in Washington Co., Maryland (6/20/2015). View Record Details Media by Mark Etheridge.

A Four-toothed Mason Wasp in Anne Arundel Co., Maryland (9/30/2014). Determined by Ken Wolgemuth/BugGuide. View Record Details Media by Lynn Strauss.

Four-toothed Mason Wasp in Prince George's Co., Maryland (8/25/2019). (c) jrcagle, some rights reserved (CC BY-NC). View Record Details Media by jrcagle via iNaturalist.

Four-toothed Mason Wasp in St. Mary's Co., Maryland (10/4/2020). (c) jtylerbell, some rights reserved (CC BY-NC). View Record Details Media by Tyler Bell.

Four-toothed Mason Wasp in Baltimore Co., Maryland (8/1/2020). (c) Frode Jacobsen, some rights reserved (CC BY-NC). View Record Details Media by Frode Jacobsen.

A Four-toothed Mason Wasp in Anne Arundel Co., Maryland (7/9/2011). View Record Details Media by Sue Muller.

A Four-toothed Mason Wasp in Baltimore City, Maryland (10/19/2013). View Record Details Media by Pauline Horn.

Four-toothed Mason Wasp in Howard Co., Maryland (9/6/2019). (c) smuller, some rights reserved (CC BY-NC). View Record Details Media by Sue Muller.

A Four-toothed Mason Wasp in Montgomery Co., Maryland (7/13/2014). Media by Max Wilson.

Four-toothed Mason Wasps in Frederick Co., Maryland (7/31/2019). View Record Details Media by Katie Woods.

A male Four-toothed Mason Wasp in Baltimore City, Maryland (9/29/2015). View Record Details Media by Pauline Horn.

A Four-toothed Mason Wasp found by students at Jemicy School in Baltimore Co., Maryland (7/10/2015). View Record Details Media by Emily Stanley.

A Four-toothed Mason Wasp in Baltimore City, Maryland (10/19/2013). View Record Details Media by Pauline Horn.

A Four-toothed Mason Wasp in Baltimore City, Maryland (8/2/2014). Determined by Ross Hill/BugGuide. View Record Details Media by Vincent Vizachero.

Four-toothed Mason Wasp in Montgomery Co., Maryland (9/4/2020). (c) Izabella Farr, some rights reserved (CC BY-NC). View Record Details Media by Izabella Farr via iNaturalist.

Four-toothed Mason Wasp in Washington Co., Maryland (7/17/2025). No rights reserved. View Record Details Media by Ian via iNaturalist.

Four-toothed Mason Wasp in Montgomery Co., Maryland (8/27/2025). (c) Hugh A. Rand, some rights reserved (CC BY-NC). View Record Details Media by hughrand via iNaturalist.

Four-toothed Mason Wasp in Prince George's Co., Maryland (10/18/2025). (c) Sue Muller, some rights reserved (CC BY-NC) View Record Details Media by Sue Muller.

Four-toothed Mason Wasp in Harford Co., Maryland (6/6/2026). (c) Nick Spigler, some rights reserved (CC BY-NC) View Record Details Media by birdsandbugs21 via iNaturalist.

A Four-toothed Mason Wasp in Calvert Co., Maryland (8/31/2016). View Record Details Media by Mary B. Hollinger.