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Coelioxys gilensis, m, left, Mariposa CA
Coelioxys gilensis, m, left, Mariposa CA
Coelioxys gilensis, m, left, Mariposa CA

The taper looks of a nest parasite of Megachile. This is Coelioxys gilensis. Found in Yosemite National park and collected for a project done by Lauren Ponisio examining the effect of fire diversity on bees (Ponisio et al. Global Change Biol. 2016).

The taper looks of a nest parasite of Megachile. This is Coelioxys gilensis. Found in Yosemite National park and collected for a project done by Lauren Ponisio examining the effect of fire diversity on bees (Ponisio et al. Global Change Biol. 2016).

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Coelioxys hunteri, M, abdomen posterior, MD, Cecil County
Coelioxys hunteri, M, abdomen posterior, MD, Cecil County
Coelioxys hunteri, M, abdomen posterior, MD, Cecil County

Coelioxys hunteri, male, a bee that is a nest parasite of leaf cutting bees. This is just the specialized and distinctive end of this lovely bee. Jones County Georgia, obtained form the USFS Experiment Station...

Coelioxys hunteri, male, a bee that is a nest parasite of leaf cutting bees. This is just the specialized and distinctive end of this lovely bee. Jones County Georgia, obtained form the USFS Experiment Station...

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Coelioxys immaculata, m, back, Caroline Co., MD
Coelioxys immaculata, m, back, Caroline Co., MD
Coelioxys immaculata, m, back, Caroline Co., MD

This bee, Coelioxys immaculata, is an uncommon nest parasite of other bees. Almost by definition it must be less common since the young C. immaculata usurps a cell of a leaf-cutter bee, kills the host baby bee and eats its food before emerging the next year. Note the interesting pattern of lobes on its tail end. Mysterious.

This bee, Coelioxys immaculata, is an uncommon nest parasite of other bees. Almost by definition it must be less common since the young C. immaculata usurps a cell of a leaf-cutter bee, kills the host baby bee and eats its food before emerging the next year. Note the interesting pattern of lobes on its tail end. Mysterious.

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Coelioxys immaculata, m, back, Caroline Co., MD
Coelioxys immaculata, m, back, Caroline Co., MD
Coelioxys immaculata, m, back, Caroline Co., MD

I think this was the first confirmed state record (Maryland) for this species (Coelioxys immaculata). It was found in Caroline County in a sandy area. Not clear what it is a nest parasite of (almost certainly a Megachile). Something for someone to do....good amateur project. Picture by Amanda Hong.

I think this was the first confirmed state record (Maryland) for this species (Coelioxys immaculata). It was found in Caroline County in a sandy area. Not clear what it is a nest parasite of (almost certainly a Megachile). Something for someone to do....good amateur project. Picture by Amanda Hong.

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Coelioxys immaculata, m, face, Caroline County, MD
Coelioxys immaculata, m, face, Caroline County, MD
Coelioxys immaculata, m, face, Caroline County, MD

This bee, Coelioxys immaculata, is an uncommon nest parasite of other bees. Almost by definition it must be less common since the young C. immaculata usurps a cell of a leaf-cutter bee, kills the host baby bee and eats its food before emerging the next year. Note the interesting pattern of lobes on its tail end. Mysterious.

This bee, Coelioxys immaculata, is an uncommon nest parasite of other bees. Almost by definition it must be less common since the young C. immaculata usurps a cell of a leaf-cutter bee, kills the host baby bee and eats its food before emerging the next year. Note the interesting pattern of lobes on its tail end. Mysterious.

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Coelioxys immaculata, m, left, Caroline County, MD
Coelioxys immaculata, m, left, Caroline County, MD
Coelioxys immaculata, m, left, Caroline County, MD

This bee, Coelioxys immaculata, is an uncommon nest parasite of other bees. Almost by definition it must be less common since the young C. immaculata usurps a cell of a leaf-cutter bee, kills the host baby bee and eats its food before emerging the next year. Note the interesting pattern of lobes on its tail end. Mysterious.

This bee, Coelioxys immaculata, is an uncommon nest parasite of other bees. Almost by definition it must be less common since the young C. immaculata usurps a cell of a leaf-cutter bee, kills the host baby bee and eats its food before emerging the next year. Note the interesting pattern of lobes on its tail end. Mysterious.

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Coelioxys moesta, F, Side, MI, Keweenaw County
Coelioxys moesta, F, Side, MI, Keweenaw County
Coelioxys moesta, F, Side, MI, Keweenaw County

Colby Francoeur took this picture of a Coelioxys moesta from Pictured Rocks National Monument in Keweenaw County, Michigan. This bee lays its eggs in the nests of Megachile bees. Photography Information: 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.

Colby Francoeur took this picture of a Coelioxys moesta from Pictured Rocks National Monument in Keweenaw County, Michigan. This bee lays its eggs in the nests of Megachile bees. Photography Information: 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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Coelioxys moesta, female, face
Coelioxys moesta, female, face
Coelioxys moesta, female, face

Coelioxys moesta, female, rare nest parasite of Megachile bees

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Coelioxys moesta, male, side
Coelioxys moesta, male, side
Coelioxys moesta, male, side

Coelioxys moesta, male, Maryland, Garrett County, Collected by Department of Agriculture

Coelioxys moesta, male, Maryland, Garrett County, Collected by Department of Agriculture

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Coelioxys novomexicana, f, back, Yolo, CA
Coelioxys novomexicana, f, back, Yolo, CA
Coelioxys novomexicana, f, back, Yolo, CA

Coelioxys....invader of Megachile nests. This female is designed to slice into Meg nests and insert and egg which later will kill the baby leaf cutter and consume the food. This one is from the Southwest, Coelioxys novomexicana. This bee was collected in the California Central Valley in Yolo County for research on small-scale restoration in agricultural areas.

Coelioxys....invader of Megachile nests. This female is designed to slice into Meg nests and insert and egg which later will kill the baby leaf cutter and consume the food. This one is from the Southwest, Coelioxys novomexicana. This bee was collected in the California Central Valley in Yolo County for research on small-scale restoration in agricultural areas.

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Coelioxys novomexicana, f, face, Yolo, CA
Coelioxys novomexicana, f, face, Yolo, CA
Coelioxys novomexicana, f, face, Yolo, CA

Coelioxys....invader of Megachile nests. This female is designed to slice into Meg nests and insert and egg which later will kill the baby leaf cutter and consume the food. This one is from the Southwest, Coelioxys novomexicana. This bee was collected in the California Central Valley in Yolo County for research on small-scale restoration in agricultural areas.

Coelioxys....invader of Megachile nests. This female is designed to slice into Meg nests and insert and egg which later will kill the baby leaf cutter and consume the food. This one is from the Southwest, Coelioxys novomexicana. This bee was collected in the California Central Valley in Yolo County for research on small-scale restoration in agricultural areas.

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Coelioxys novomexicana, f, right, Yolo, CA
Coelioxys novomexicana, f, right, Yolo, CA
Coelioxys novomexicana, f, right, Yolo, CA

Coelioxys....invader of Megachile nests. This female is designed to slice into Meg nests and insert and egg which later will kill the baby leaf cutter and consume the food. This one is from the Southwest, Coelioxys novomexicana. This bee was collected in the California Central Valley in Yolo County for research on small-scale restoration in agricultural areas.

Coelioxys....invader of Megachile nests. This female is designed to slice into Meg nests and insert and egg which later will kill the baby leaf cutter and consume the food. This one is from the Southwest, Coelioxys novomexicana. This bee was collected in the California Central Valley in Yolo County for research on small-scale restoration in agricultural areas.

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Coelioxys obtusiventris, f, back, Clark Co., Rose Pond, CA
Coelioxys obtusiventris, f, back, Clark Co., Rose Pond, CA
Coelioxys obtusiventris, f, back, Clark Co., Rose Pond, CA

Super rare. Only a few individuals of this species have been found, but, interestingly, this species has been found twice in Missouri, and once in Pennsylvania, New Jersey, and Florida. This one was sent to me by Mike Arduser and collected in Clark County, Missouri. Note the lovely flair of hairs around the end of the abdomen....very distinctive.

Super rare. Only a few individuals of this species have been found, but, interestingly, this species has been found twice in Missouri, and once in Pennsylvania, New Jersey, and Florida. This one was sent to me by Mike Arduser and collected in Clark County, Missouri. Note the lovely flair of hairs around the end of the abdomen....very distinctive.

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Coelioxys obtusiventris, f, face, Clark Co., Rose Pond, CA
Coelioxys obtusiventris, f, face, Clark Co., Rose Pond, CA
Coelioxys obtusiventris, f, face, Clark Co., Rose Pond, CA

Super rare. Only a few individuals of this species have been found, but, interestingly, this species has been found twice in Missouri, and once in Pennsylvania, New Jersey, and Florida. This one was sent to me by Mike Arduser and collected in Clark County, Missouri. Note the lovely flair of hairs around the end of the abdomen....very distinctive.

Super rare. Only a few individuals of this species have been found, but, interestingly, this species has been found twice in Missouri, and once in Pennsylvania, New Jersey, and Florida. This one was sent to me by Mike Arduser and collected in Clark County, Missouri. Note the lovely flair of hairs around the end of the abdomen....very distinctive.

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Coelioxys obtusiventris, f, hind end, Clark Co., Rose Pond, CA
Coelioxys obtusiventris, f, hind end, Clark Co., Rose Pond, CA
Coelioxys obtusiventris, f, hind end, Clark Co., Rose Pond, CA

Super rare. Only a few individuals of this species have been found, but, interestingly, this species has been found twice in Missouri, and once in Pennsylvania, New Jersey, and Florida. This one was sent to me by Mike Arduser and collected in Clark County, Missouri. Note the lovely flair of hairs around the end of the abdomen....very distinctive.

Super rare. Only a few individuals of this species have been found, but, interestingly, this species has been found twice in Missouri, and once in Pennsylvania, New Jersey, and Florida. This one was sent to me by Mike Arduser and collected in Clark County, Missouri. Note the lovely flair of hairs around the end of the abdomen....very distinctive.

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Coelioxys obtusiventris, f, left side, Clark Co., Rose Pond, CA
Coelioxys obtusiventris, f, left side, Clark Co., Rose Pond, CA
Coelioxys obtusiventris, f, left side, Clark Co., Rose Pond, CA

Super rare. Only a few individuals of this species have been found, but, interestingly, this species has been found twice in Missouri, and once in Pennsylvania, New Jersey, and Florida. This one was sent to me by Mike Arduser and collected in Clark County, Missouri. Note the lovely flair of hairs around the end of the abdomen....very distinctive.

Super rare. Only a few individuals of this species have been found, but, interestingly, this species has been found twice in Missouri, and once in Pennsylvania, New Jersey, and Florida. This one was sent to me by Mike Arduser and collected in Clark County, Missouri. Note the lovely flair of hairs around the end of the abdomen....very distinctive.