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Species Bombus crotchii - Crotch's Bumble Bee

Large Bee: Bumble, or Have I Bungled It? - Bombus crotchii - male Bombus melanopygus? - Bombus crotchii Bumble or Carpenter Bee? - Bombus crotchii - male Bumble or Carpenter Bee? - Bombus crotchii - male Bumblebee on Stiffbranch Birds Beak black face yellow thorax abdomen with yellow and redish orange bands - Bombus crotchii Bumble Bee lands on a dry weed stalk in a open grassland, then flies off and lands again on the same stalk, protecting ??? - Bombus crotchii Bombus on Salt Marsh Bird's Beak - Bombus crotchii - female Bumble Bee crawling upside down on a tarweed stem  - Bombus crotchii
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Hymenoptera (Ants, Bees, Wasps and Sawflies)
No Taxon (Aculeata - Ants, Bees and Stinging Wasps)
No Taxon (Anthophila (Apoidea) - Bees)
Family Apidae (Cuckoo, Carpenter, Digger, Bumble, and Honey Bees)
Subfamily Apinae (Honey, Bumble, Long-horned, Orchid, and Digger Bees)
Tribe Bombini (Bumble Bees)
Genus Bombus (Bumble Bees)
No Taxon (Subgenus Cullumanobombus)
Species crotchii (Crotch's Bumble Bee)
Other Common Names
Crotch (sic) Bumble Bee
Synonyms and other taxonomic changes
Bombus nigrocinctus Provancher, 1888; Bombus crotchii var nigricaudus Frison, 1927
Explanation of Names
Author: Cresson, 1878
Females are identified by contrasting yellow band on T2 (vs. more apical segments in certain other sympatric species) and orange-red tail tip (vs. white in occidentalis). Males have large eyes, a black interalar band, and basal terga extensively yellow contrasting with an orange-red tail.
Southwestern United States, where best known from cismontane California
Occurs at relatively warm and dry sites, including the inner Coast Range of California and even the margins of the Mojave Desert
The Hosts section of its Discover Life species page lists known associations based on specimen records and images.
Likely undersampled in Bombus-specific studies as these focus on colder and more mesic habitats where bumble bees are more diverse