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USGS Bee Lab at the Eastern Ecological Science Center images.

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Andrena fenningeri, F, Face 2, Bowie, Maryland
Andrena fenningeri, F, Face 2, Bowie, Maryland
Andrena fenningeri, F, Face 2, Bowie, Maryland

A very early spring bee, covered in pollen, collected by a homeowner in Bowie, Maryland, often found on maples

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Andrena forbesii, f, back Maryland
Andrena forbesii, f, back Maryland
Andrena forbesii, f, back Maryland

Another member of the difficult to identify Trachandrena subgenus of Andrena. I think that I have the females sorted out (more or less) but the males...oi! This specimen from Maryland. Picture by Amanda Robinson.

Another member of the difficult to identify Trachandrena subgenus of Andrena. I think that I have the females sorted out (more or less) but the males...oi! This specimen from Maryland. Picture by Amanda Robinson.

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Andrena forbesii, f, side, Maryland
Andrena forbesii, f, side, Maryland
Andrena forbesii, f, side, Maryland

Another member of the difficult to identify Trachandrena subgenus of Andrena. I think that I have the females sorted out (more or less) but the males...oi! This specimen from Maryland. Picture by Amanda Robinson.

Another member of the difficult to identify Trachandrena subgenus of Andrena. I think that I have the females sorted out (more or less) but the males...oi! This specimen from Maryland. Picture by Amanda Robinson.

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Andrena forbesii, Female, Back, Maryland
Andrena forbesii, Female, Back, Maryland
Andrena forbesii, Female, Back, Maryland

There are a group of bees in the genus Andrena that form a fairly distinct subgenus called Tracandrena. They are notorious for being difficult to separate out and, in particular, the males all look pretty much the same. I have created a little Excel spreadsheet that help separate out the females, if anyone is interested.

There are a group of bees in the genus Andrena that form a fairly distinct subgenus called Tracandrena. They are notorious for being difficult to separate out and, in particular, the males all look pretty much the same. I have created a little Excel spreadsheet that help separate out the females, if anyone is interested.

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Andrena fulvipennis, F, Face 1, MD
Andrena fulvipennis, F, Face 1, MD
Andrena fulvipennis, F, Face 1, MD

An odd, dark Andrena bee of deep sandy areas that comes out in the middle of summer

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Andrena fulvipennis, M, end of abdomen, MD, Anne Arundel County
Andrena fulvipennis, M, end of abdomen, MD, Anne Arundel County
Andrena fulvipennis, M, end of abdomen, MD, Anne Arundel County

Andrena fulvipennis "“ A very rare species this male was captured in an old sand pit in Anne Arundel County, Maryland. This species is only found in deep, permanently sandy locations. Picture taken by Brooke Alexander.

Andrena fulvipennis "“ A very rare species this male was captured in an old sand pit in Anne Arundel County, Maryland. This species is only found in deep, permanently sandy locations. Picture taken by Brooke Alexander.

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Andrena fulvipennis, M, Face, MD, Anne Arundel County
Andrena fulvipennis, M, Face, MD, Anne Arundel County
Andrena fulvipennis, M, Face, MD, Anne Arundel County

Andrena fulvipennis "“ A very rare species this male was captured in an old sand pit in Anne Arundel County, Maryland. This species is only found in deep, permanently sandy locations. Picture taken by Brooke Alexander.

Andrena fulvipennis "“ A very rare species this male was captured in an old sand pit in Anne Arundel County, Maryland. This species is only found in deep, permanently sandy locations. Picture taken by Brooke Alexander.

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Andrena fulvipennis, M, Side, MD, Anne Arundel County
Andrena fulvipennis, M, Side, MD, Anne Arundel County
Andrena fulvipennis, M, Side, MD, Anne Arundel County

Andrena fulvipennis "“ A very rare species this male was captured in an old sand pit in Anne Arundel County, Maryland. This species is only found in deep, permanently sandy locations. Picture taken by Brooke Alexander.

Andrena fulvipennis "“ A very rare species this male was captured in an old sand pit in Anne Arundel County, Maryland. This species is only found in deep, permanently sandy locations. Picture taken by Brooke Alexander.

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Andrena gardineri, M, Back, OH, Washington County
Andrena gardineri, M, Back, OH, Washington County
Andrena gardineri, M, Back, OH, Washington County

An often uncommon spring Andrena, I associate with the Appalachians, this is a male with a sweet yellow clypeus. Collected by MaLisa Spring near Marietta, Ohio. Photograph by Brooke Alexander. Canon Mark II 5D, Zerene Stacker, Stackshot Sled, 65mm Canon MP-E 1-5X macro lens, Twin Macro Flash in Styrofoam Cooler, F5.0, ISO 100, Shutter Speed 200

An often uncommon spring Andrena, I associate with the Appalachians, this is a male with a sweet yellow clypeus. Collected by MaLisa Spring near Marietta, Ohio. Photograph by Brooke Alexander. Canon Mark II 5D, Zerene Stacker, Stackshot Sled, 65mm Canon MP-E 1-5X macro lens, Twin Macro Flash in Styrofoam Cooler, F5.0, ISO 100, Shutter Speed 200

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Andrena gardineri, M, Face, OH, Washington County
Andrena gardineri, M, Face, OH, Washington County
Andrena gardineri, M, Face, OH, Washington County

An often uncommon spring Andrena, I associate with the Appalachians, this is a male with a sweet yellow clypeus. Collected by MaLisa Spring near Marietta, Ohio. Photograph by Brooke Alexander. Canon Mark II 5D, Zerene Stacker, Stackshot Sled, 65mm Canon MP-E 1-5X macro lens, Twin Macro Flash in Styrofoam Cooler, F5.0, ISO 100, Shutter Speed 200

An often uncommon spring Andrena, I associate with the Appalachians, this is a male with a sweet yellow clypeus. Collected by MaLisa Spring near Marietta, Ohio. Photograph by Brooke Alexander. Canon Mark II 5D, Zerene Stacker, Stackshot Sled, 65mm Canon MP-E 1-5X macro lens, Twin Macro Flash in Styrofoam Cooler, F5.0, ISO 100, Shutter Speed 200

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Andrena gardineri, M, Side, OH, Washington County
Andrena gardineri, M, Side, OH, Washington County
Andrena gardineri, M, Side, OH, Washington County

An often uncommon spring Andrena, I associate with the Appalachians, this is a male with a sweet yellow clypeus. Collected by MaLisa Spring near Marietta, Ohio. Photograph by Brooke Alexander. Canon Mark II 5D, Zerene Stacker, Stackshot Sled, 65mm Canon MP-E 1-5X macro lens, Twin Macro Flash in Styrofoam Cooler, F5.0, ISO 100, Shutter Speed 200

An often uncommon spring Andrena, I associate with the Appalachians, this is a male with a sweet yellow clypeus. Collected by MaLisa Spring near Marietta, Ohio. Photograph by Brooke Alexander. Canon Mark II 5D, Zerene Stacker, Stackshot Sled, 65mm Canon MP-E 1-5X macro lens, Twin Macro Flash in Styrofoam Cooler, F5.0, ISO 100, Shutter Speed 200

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Andrena geranii, F, back, WI
Andrena geranii, F, back, WI
Andrena geranii, F, back, WI

Two different specimens of Andrena geranii. A northernish species that appears to be a specialist on ....geraniums. Notable is the slight blue metallic sheen to the body. Aaman Dengis and Brooke Alexander took the pictures.

Two different specimens of Andrena geranii. A northernish species that appears to be a specialist on ....geraniums. Notable is the slight blue metallic sheen to the body. Aaman Dengis and Brooke Alexander took the pictures.

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Andrena geranii, F, Face, WI
Andrena geranii, F, Face, WI
Andrena geranii, F, Face, WI

Two different specimens of Andrena geranii. A northernish species that appears to be a specialist on ....geraniums. Notable is the slight blue metallic sheen to the body. Aaman Dengis and Brooke Alexander took the pictures.

Two different specimens of Andrena geranii. A northernish species that appears to be a specialist on ....geraniums. Notable is the slight blue metallic sheen to the body. Aaman Dengis and Brooke Alexander took the pictures.

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Andrena geranii, F, Side, MD, Calvert Co
Andrena geranii, F, Side, MD, Calvert Co
Andrena geranii, F, Side, MD, Calvert Co

Two different specimens of Andrena geranii. A northernish species that appears to be a specialist on ....geraniums. Notable is the slight blue metallic sheen to the body. Aaman Dengis and Brooke Alexander took the pictures.

Two different specimens of Andrena geranii. A northernish species that appears to be a specialist on ....geraniums. Notable is the slight blue metallic sheen to the body. Aaman Dengis and Brooke Alexander took the pictures.

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Andrena gnaphalii, f, back 2, Santa Barbara, CA
Andrena gnaphalii, f, back 2, Santa Barbara, CA
Andrena gnaphalii, f, back 2, Santa Barbara, CA

Another odd ball Andrena from the Channel Islands. This one is A. gnaphalli, collected as part of a larger study of bees in climatically vulnerable National Parks. An apparent Asteraceaea specialist with some glints of green and red instead of the normal black integument.

Another odd ball Andrena from the Channel Islands. This one is A. gnaphalli, collected as part of a larger study of bees in climatically vulnerable National Parks. An apparent Asteraceaea specialist with some glints of green and red instead of the normal black integument.

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Andrena gnaphalii, f, back, Santa Barbara, CA
Andrena gnaphalii, f, back, Santa Barbara, CA
Andrena gnaphalii, f, back, Santa Barbara, CA

Another odd ball Andrena from the Channel Islands. This one is A. gnaphalli, collected as part of a larger study of bees in climatically vulnerable National Parks. An apparent Asteraceaea specialist with some glints of green and red instead of the normal black integument.

Another odd ball Andrena from the Channel Islands. This one is A. gnaphalli, collected as part of a larger study of bees in climatically vulnerable National Parks. An apparent Asteraceaea specialist with some glints of green and red instead of the normal black integument.

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Andrena gnaphalii, f, face, Santa Barbara Co., CA
Andrena gnaphalii, f, face, Santa Barbara Co., CA
Andrena gnaphalii, f, face, Santa Barbara Co., CA

Not the best lighting, but this is Andrena gnaphalii....a interesting Andrena with a green tinge. From the Channel Islands off the coast of California. Photo by Anders Croft.

Not the best lighting, but this is Andrena gnaphalii....a interesting Andrena with a green tinge. From the Channel Islands off the coast of California. Photo by Anders Croft.

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Andrena gnaphalii, f, left, Santa Barbara Co., CA
Andrena gnaphalii, f, left, Santa Barbara Co., CA
Andrena gnaphalii, f, left, Santa Barbara Co., CA

Not the best lighting, but this is Andrena gnaphalii....a interesting Andrena with a green tinge. From the Channel Islands off the coast of California. Photo by Anders Croft.

Not the best lighting, but this is Andrena gnaphalii....a interesting Andrena with a green tinge. From the Channel Islands off the coast of California. Photo by Anders Croft.

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Andrena gnaphalii, f, side, Santa Barbara, CA
Andrena gnaphalii, f, side, Santa Barbara, CA
Andrena gnaphalii, f, side, Santa Barbara, CA

Another odd ball Andrena from the Channel Islands. This one is A. gnaphalli, collected as part of a larger study of bees in climatically vulnerable National Parks. An apparent Asteraceaea specialist with some glints of green and red instead of the normal black integument.

Another odd ball Andrena from the Channel Islands. This one is A. gnaphalli, collected as part of a larger study of bees in climatically vulnerable National Parks. An apparent Asteraceaea specialist with some glints of green and red instead of the normal black integument.

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