Over Two Dozen Rare Bees Discovered In Washington

The Washington State Department of Agriculture says in its first year, the state’s new Bee Atlas netted over 25 new or rare bee species. The WSDA said volunteers searched the state for native bees and their host plants that have never been recorded in Washington. The purpose of the Washington Bee Atlas is to find and document native bees to better understand what bees in Washington are doing well, and which bees may need conservation support.

Over A Dozen Bee Species Have Never Been Reported In Washington Before

In 2024, 67 Washington Bee Atlas volunteers collected over 17,000 specimens on more than 600 different host plants. While many of these bees have yet to be identified, the WSDA said several remarkable discoveries have already been made, including a bee which had not been recorded in the state since 1917 and one that had never been found in Western Washington, in addition to 15 species which had never been collected in the state before.

The new or rare species the volunteers have found thus far include:

Anthophora crotchii – a charismatic and rare digger bee previously only known from a small population near the Tri-Cities – collected in both Kittitas and Grant counties
Ashmeadiella sculleni – a state record collected in Yakima and Grant counties
Atoposmia abjecta abjecta – a state record collected in Chelan County
Biastes fulviventris – a state record and rare kleptoparasitic bee – meaning it sneaks into the nests of other bees to lay its eggs – with two forks on its abdomen, collected in Chelan, Kittitas and Okanogan counties
Calliopsis personata – a rare mining bee collected in Grant County
Coelioxys funerarius – a state record of a kleptoparasitic bee collected in Chelan County
Diadasia australis – a state record collected in Yakima County
Diadasia nitidifrons – a rare specialist on globemallow, collected in Yakima County. This bee was last documented in Washington in 1919. The possibility remains that this could also be an undescribed species
Dianthidium cressoni – a state record collected in Chelan County
Dianthidium singulare – a state record collected in Chelan County
Dioxys aurifuscus – a state record* collected in Grant County
Dufourea dilatipes – a state record collected in Chelan and Douglas counties
Eucera mohavensis – a state record collected in Grant County
Melissodes dagosus – a rare and unusual sunflower specialist collected in Grant and Kittitas counties. This species was last documented in the state in 1973
Melissodes nigracauda – a state record* collected in Chelan County and a vast range extension. The next closest records of this species are in California
Melissodes saponellus – a rare bee collected in Grant County
Osmia cara – a rare mason bee collected in Okanogan County
Osmia cyaneonitans – a state record collected in Chelan County
Osmia rawlinsi – a rare mason bee collected in Yakima and Grant counties
Osmia trifoliama – a rare mason bee collected in Thurston County
Osmia vandykei – a rare mason bee with clubbed antennae collected in Grant and Kittitas counties
Panurginus ineptus – a rare bee collected in Chelan County
Stelis heronae – a state record collected in Chelan County
Stelis laticincta – a rare bee collected in Clark County
Stelis subcaerulea – a rare bee collected in Pierce and Yakima counties. This is the first record of this species in Western Washington
Xylocopa virginica – a very large carpenter bee and state record* collected in Benton County.

Many of these bees were detected in Central Washington, likely because most native bees have adapted to thrive in dry areas like the microclimates found East of the Cascade Mountains. Also, there are very few historic bee collection records in much of this predominantly rural area.

“We’re already learning fascinating things about our native bees, and we’re only getting started,” Karen Wright, WSDA pollinator taxonomist, said. “But we still need more help. Washington is a large state and there are some counties where we don’t have a single volunteer. We’d love to have more people trained and out there looking for and recording our native bees.”

WSDA Needs Help Finding Native Bees

The Washington Bee Atlas is a project of the WSDA Pollinator Program. Most bee collecting is done by volunteers trained to collect, pin museum-quality specimens and record the location and host plant where the specimen was collected. The volunteers then submit the pinned specimens to Wright for identification. Eventually, all specimens not used for education and outreach will reside in the Washington State University entomology museum.

Anyone over 18 years old is welcome to become a Washington Bee Atlas volunteer. Volunteers complete extensive training (similar to the Master Gardener training program) to participate. Visit the WSDA's Website to learn more about the Department's Pollinator Program, the Washington Bee Atlas or to sign up to volunteer.

“These are just our preliminary findings," Wright said. “There are still many more bees to identify from what has been collected, not to mention lots of opportunities to find new or rare species.”

The Washington Bee Atlas also documents the floral resources that native bees utilize and hopes to develop recommendations for ecoregion-specific seed mixes to support pollinators. All of the bee determination data is currently being added to Ecdysis, with plans for more ways to make the data usable by the public currently being discussed.

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