Pollinators of Thomas Stone

Thomas Stone National Historic Site preserves more than just the story of a signer of the Declaration of Independence and his home. Just under that surface are a multitude of stories and resources that do not have the same spotlight shown on them as the namesake of the park. These hidden stories include pollinators.

Pollinators are a key part of our world today. These animals move pollen between plants, which helps the plants create fruits and seeds. Even during the colonial era, pollinators were an important part of the ecosystem helping the orchards and other fields grow.
 
A zebra butterfly on a milkweed plant
A butterfly on a milkweed plant.

NPS

 

 

Introduction to the Survey

In June and July 2024, Benjamin Shoemaker, Eagle Scout candidate from Boy Scout Troop 1778 in Waldorf, Maryland led a team of scouts and volunteers to conduct a pollinator survey in and around the meadows of the Thomas Stone National Historic Site. They were arranged in three teams, who located, photographed, and later identified the pollinators. Each team was assigned an area of the Thomas Stone National Historic Site meadows—Area A, Area B, and Area C. They performed their survey in the morning and early afternoon on two separate days in June and July, respectively.

Results of the Survey

Day 1 Morning Survey
Species Area A Area B Area C Total Areas
Eastern Tailed Blue Butterfly 1 1 3 5
Common Eastern Bumble Bee 3 0 1 4
Branded Grass Skipper 1 0 0 1
Japanese Beetle 0 0 4 4
Pearl Crescent Butterfly 0 0 1 1
Red Milkweed Beetle 1 0 0 1
Small Milkweed Bug 0 0 0 0
Wasp 0 0 0 0
Red Spotted Purple Butterfly 0 0 0 0
Mosquito 0 0 0 0
North American Luna Moth 0 0 0 0
Tiger Swallowtail 0 0 0 0
Zebra Swallowtail 0 0 0 0

Day 1 Afternoon Survey
Species Area A Area B Area C Total Areas
Eastern Tailed Blue Butterfly 0 0 0 0
Common Eastern Bumble Bee 0 0 0 0
Branded Grass Skipper 0 0 0 0
Japanese Beetle 4 1 3 8
Pearl Crescent Butterfly 0 0 0 0
Red Milkweed Beetle 4 0 0 4
Small Milkweed Bug 1 0 7 8
Wasp 0 0 1 1
Red Spotted Purple Butterfly 0 1 0 1
Mosquito 0 0 1 1
North American Luna Moth 0 0 0 0
Tiger Swallowtail 0 0 0 0
Zebra Swallowtail 0 0 0 0

Day 2 Morning Survey
Species Area A Area B Area C Total Areas
Eastern Tailed Blue Butterfly 1 0 0 1
Common Eastern Bumble Bee 0 0 0 0
Branded Grass Skipper 0 0 0 0
Japanese Beetle 5 0 4 9
Pearl Crescent Butterfly 0 0 0 0
Red Milkweed Beetle 0 0 0 0
Small Milkweed Bug 2 1 2 5
Wasp 0 0 0 0
Red Spotted Purple Butterfly 0 0 0 0
Mosquito 0 0 0 0
North American Luna Moth 0 0 0 0
Tiger Swallowtail 0 0 0 0
Zebra Swallowtail 0 0 0 0

Day 2 Afternoon Survey
Species Area A Area B Area C Total Areas
Eastern Tailed Blue Butterfly 0 0 0 0
Common Eastern Bumble Bee 0 0 0 0
Branded Grass Skipper 0 0 0 0
Japanese Beetle 6 0 13 19
Pearl Crescent Butterfly 1 0 0 1
Red Milkweed Beetle 0 0 0 0
Small Milkweed Bug 2 0 0 2
Wasp 0 0 0 0
Red Spotted Purple Butterfly 0 0 0 0
Mosquito 0 0 0 0
North American Luna Moth 1 0 0 1
Tiger Swallowtail 0 1 0 1
Zebra Swallowtail 0 0 1 1

Survey Summary

Total Survey
Species Area A Area B Area C Total Areas
Eastern Tailed Blue Butterfly 2 1 3 6
Common Eastern Bumble Bee 3 0 1 4
Branded Grass Skipper 1 0 0 1
Japanese Beetle 15 1 24 40
Pearl Crescent Butterfly 1 0 1 2
Red Milkweed Beetle 5 0 0 5
Small Milkweed Bug 5 1 9 15
Wasp 0 0 1 1
Red Spotted Purple Butterfly 0 1 0 1
Mosquito 0 0 1 1
North American Luna Moth 1 0 0 1
Tiger Swallowtail 0 1 0 1
Zebra Swallowtail 0 0 1 1

 

Common Identified Species

 
A small insect hanging upside down off of a green leaf.
An example of a small milkweed bug that was found in the meadows at Thomas Stone NHS.

NPS/Shoemaker

Small Milkweed Bug
Scientific Name: Lygaeus kalmii

These insects can be identified by the black and orange pattern on their back that creates an orange x shape, their about 0.5 inch size, and they are frequently found on their host plant of milkweed. While there are many species that will pollinate milkweed directly from the flower, very few species can tolerate the sticky sap that contains toxic cardiac glycosides. The milkweed bugs are one of the species that can survive the toxic chemicals in milkweed and will actually eat the plant and its seeds. The milkweed bug has adapted to utilize the consumed toxins as a defense against predators.
 
A small red beetle with black dots standing on small round green flower bulbs of the milkweed plant.
A red milkweed beetle observed on a common milkweed plant in the meadow.

NPS/Shoemaker

Red Milkweed Beetle
Scientific Name: Tetraopes tetraophthalmus

The red milkweed beetle's scientific name is derived from the four eyes that are separated by their antenna. This distinct physical trait is an easy identifier for the species along with the red back with black oval-shaped spots. Just like the milkweed bugs these beetles are connected to milkweed, with the plant working as both a host and food source.
 

How can you get involved?

The pollinators found in the meadows in June and July are not the only pollinators that play a role in the ecosystem at the Thomas Stone National Historic Site. The flowering plants in the spring and fall months also attract pollinators and additional species. There are numerous types of bees and butterflies that contribute to the diverse flora and fauna at the site.

Eagle Scout candidate Benjamin Shoemaker and the survey team he led essentially took a “snapshot” in time of the pollinators at the Thomas Stone National Historic Site. They contributed their findings to the iNaturalist website. They uploaded photos of their identified pollinators to the iNaturalist website, tagging the location as being at the Thomas Stone National Historic Site. This allows biologists to track and monitor the species and their observed frequency in the park. You can add to the collection of knowledge related to Thomas Stone National Historic Site’s ecosystem too!

Last updated: March 26, 2025

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