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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.

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.

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.

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.

Coelioxys moesta, female, rare nest parasite of Megachile bees

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

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.

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.

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.

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.

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.

A nest parasite, this time a male. Coelioxys octodentata is a counterpart to the more commonly found C. sayi. I associate this species with drier and perhaps sandier locations, perhaps as the nest parasite of things like Megachile brevis. Note the characteristic teeth sticking out of the rear of this bee.

East Coast, West Coast, this parasitic species, Coelioxys octodentata occurs throughout the United States, almost completely filling the country with records and stopping at the border for some reason. How closely related are the specimens on the Pacific edge versus the Atlantic? Unknown, but for now they are just one species. Red legs are classic C.

A nest parasite, this time a male. Coelioxys octodentata is a counterpart to the more commonly found C. sayi. I associate this species with drier and perhaps sandier locations, perhaps as the nest parasite of things like Megachile brevis. Note the characteristic teeth sticking out of the rear of this bee.

A nest parasite, this time a male. Coelioxys octodentata is a counterpart to the more commonly found C. sayi. I associate this species with drier and perhaps sandier locations, perhaps as the nest parasite of things like Megachile brevis. Note the characteristic teeth sticking out of the rear of this bee.

East Coast, West Coast, this parasitic species, Coelioxys octodentata occurs throughout the United States, almost completely filling the country with records and stopping at the border for some reason. How closely related are the specimens on the Pacific edge versus the Atlantic? Unknown, but for now they are just one species. Red legs are classic C.

An invader of other bees nests, this is Coelioxys porterae, found, in this case from Acadia National Park in Maine. I can't recall which species of Megachile (leaf cutting bees) this species parasitizes us but there are plenty of options in the park. This is a male, and as with almost all males it has all kinds of pointy projections on its rear end.