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Parasite. Nest parasite to be exact. Formerly in the genus Psithyrus these bees are now in the genus Bombus, with the rest of the bumble bees.

Parasite. Nest parasite to be exact. Formerly in the genus Psithyrus these bees are now in the genus Bombus, with the rest of the bumble bees.

From the U.S. National Arboretum comes the now relatively uncommon Bombus fervidus. A species in delcine, but still present and how nice to have this one present right in Washington D.C. Pictures by Ashleigh Jacobs.

From the U.S. National Arboretum comes the now relatively uncommon Bombus fervidus. A species in delcine, but still present and how nice to have this one present right in Washington D.C. Pictures by Ashleigh Jacobs.

From the U.S. National Arboretum comes the now relatively uncommon Bombus fervidus. A species in delcine, but still present and how nice to have this one present right in Washington D.C. Pictures by Ashleigh Jacobs.

From the U.S. National Arboretum comes the now relatively uncommon Bombus fervidus. A species in delcine, but still present and how nice to have this one present right in Washington D.C. Pictures by Ashleigh Jacobs.

Bombus fervidus, female, ,Queen Anne's County, Maryland

Ah, reaching way back in history now to 2012,,,,not completely satisfied with this shot of B. flavifrons, but it will have to do. From Wyoming, where a number of red butted bumble bees live.

Ah, reaching way back in history now to 2012,,,,not completely satisfied with this shot of B. flavifrons, but it will have to do. From Wyoming, where a number of red butted bumble bees live.

Bombus fraternus. The Southern Plains Bumble Bee. This crisp, handsome and short-faced bee suffers from lack of an adequate publicist. Thought, several other Bumble Bees in its clan, to be in decline from introduced pathogens. It gets little mention in the bee press.

Bombus fraternus. The Southern Plains Bumble Bee. This crisp, handsome and short-faced bee suffers from lack of an adequate publicist. Thought, several other Bumble Bees in its clan, to be in decline from introduced pathogens. It gets little mention in the bee press.

Bombus fraternus - Here is one of the very uncommon bumblebees that are of great concern these days, due to introduced parasites that have caused this species and its sister taxa to crash. Fortunately, they are still around, at least in small numbers.

Bombus fraternus - Here is one of the very uncommon bumblebees that are of great concern these days, due to introduced parasites that have caused this species and its sister taxa to crash. Fortunately, they are still around, at least in small numbers.

Bombus fraternus - Here is one of the very uncommon bumblebees that are of great concern these days, due to introduced parasites that have caused this species and its sister taxa to crash. Fortunately, they are still around, at least in small numbers.

Bombus fraternus. The Southern Plains Bumble Bee. This crisp, handsome and short-faced bee suffers from lack of an adequate publicist. Thought, several other Bumble Bees in its clan, to be in decline from introduced pathogens. It gets little mention in the bee press.

Check the eyes out on this male Bumble Bee. We already put up a spread of female B. fraternus, but the male has some pretty unique features for bumble bees. For one, the eyes are HUGE, they nearly meet at the top of the head. Only a few other bumbles do that...and the face is extremely short, with the mandibles almost joined to the bottom of the eyes.

Check the eyes out on this male Bumble Bee. We already put up a spread of female B. fraternus, but the male has some pretty unique features for bumble bees. For one, the eyes are HUGE, they nearly meet at the top of the head. Only a few other bumbles do that...and the face is extremely short, with the mandibles almost joined to the bottom of the eyes.

Check the eyes out on this male Bumble Bee. We already put up a spread of female B. fraternus, but the male has some pretty unique features for bumble bees. For one, the eyes are HUGE, they nearly meet at the top of the head. Only a few other bumbles do that...and the face is extremely short, with the mandibles almost joined to the bottom of the eyes.

Check the eyes out on this male Bumble Bee. We already put up a spread of female B. fraternus, but the male has some pretty unique features for bumble bees. For one, the eyes are HUGE, they nearly meet at the top of the head. Only a few other bumbles do that...and the face is extremely short, with the mandibles almost joined to the bottom of the eyes.

Bombus fraternus - Here is one of the very uncommon bumblebees that are of great concern these days, due to introduced parasites that have caused this species and its sister taxa to crash. Fortunately, they are still around, at least in small numbers.

This is one of the species that seems to be holding its own in terms of numbers. This worker has a corbicula on its tibia full of a mix of pollen and nectar