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Species Bombus citrinus - Lemon Cuckoo Bumble Bee

Echinacea Bee - Bombus citrinus Bumblebee - Bombus citrinus - female Cuckoo Bumblebee - Bombus citrinus - female Bombus unknown - Bombus citrinus Bombus unknown - Bombus citrinus Bombus affinis? - Bombus citrinus Bombus affinis? - Bombus citrinus Bumblebees on thistle - Bombus citrinus - male
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Class Insecta (Insects)
Order Hymenoptera (Ants, Bees, Wasps and Sawflies)
No Taxon (Aculeata - Bees, Ants, and other Stinging Wasps)
No Taxon (Anthophila (Apoidea) - Bees)
Family Apidae (Cuckoo, Carpenter, Digger, Bumble, and Honey Bees)
Subfamily Apinae (Honey, Bumble, and Digger Bees)
Tribe Bombini (Bumble Bees)
Genus Bombus (Bumble Bees)
No Taxon (Subgenus Psithyrus)
Species citrinus (Lemon Cuckoo Bumble Bee)
Synonyms and other taxonomic changes
formerly placed in Psithyrus, which is now considered a subgenus of Bombus - see links below
Explanation of Names
citrinus means "lemon-yellow", and is the origin of the common name
Range
mostly eastern North America - see nhm.ac.uk

Season
May to October.
Internet References
common name reference; PDF doc (Committee on Common Names of Insects, Entomological Society of America)
discussion on subgenus Psithyrus plus list and distribution of world species (Natural History Museum, UK)
world bee genera plus synonyms and subgenera; list based on Michener, 2000 (Doug Yanega, U. of California at Riverside)